Freescale Semiconductor TWR-P1025 Installation manual

TWR-P1025 Tower Module
Hardware User Guide
TWR-P1025HUG
Rev. 0, 3/2012

Freescale and the Freescale logo are trademarks of Freescale
Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. QUICC Engine is trademarks
of Freescale Semiconductor, Inc. All other product or service names are the
property of their respective owners.
© Freescale Semiconductor, Inc., 2012
Information in this document is provided solely to enable system and software
implementers to use Freescale Semiconductor products. There are no express or
implied copyright licenses granted hereunder to design or fabricate any integrated
circuits or integrated circuits based on the information in this document.
Freescale Semiconductor reserves the right to make changes without further notice to
any products herein. Freescale Semiconductor makes no warranty, representation or
guarantee regarding the suitability of its products for any particular purpose, nor does
Freescale Semiconductor assume any liability arising out of the application or use of
any product or circuit, and specifically disclaims any and all liability, including without
limitation consequential or incidental damages. “Typical” parameters which may be
provided in Freescale Semiconductor data sheets and/or specifications can and do
vary in different applications and actual performance may vary over time. All operating
parameters, including “Typicals” must be validated for each customer application by
customer’s technical experts. Freescale Semiconductor does not convey any license
under its patent rights nor the rights of others. Freescale Semiconductor products are
not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life,
or for any other application in which the failure of the Freescale Semiconductor product
could create a situation where personal injury or death may occur. Should Buyer
purchase or use Freescale Semiconductor products for any such unintended or
unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all
claims, costs, damages, and expenses, and reasonable attorney fees arising out of,
directly or indirectly, any claim of personal injury or death associated with such
unintended or unauthorized use, even if such claim alleges that Freescale
Semiconductor was negligent regarding the design or manufacture of the part.
Document Number: TWR-P1025HUG
Rev. 0, 3/2012
How to Reach Us:
Home Page:
www.freescale.com
Web Support:
http://www.freescale.com/support
USA/Europe or Locations Not Listed:
Freescale Semiconductor, Inc.
Technical Information Center, EL516
2100 East Elliot Road
Tempe, Arizona 85284
[phone] or
[phone]
www.freescale.com/support
Europe, Middle East, and Africa:
Freescale Halbleiter Deutschland GmbH
Technical Information Center
Schatzbogen 7
81829 Muenchen, Germany
[phone] (English)
[phone] (English)
[phone] (German)
[phone] (French)
www.freescale.com/support
Japan:
Freescale Semiconductor Japan Ltd.
Headquarters
ARCO Tower 15F
1-8-1, Shimo-Meguro, Meguro-ku
Tokyo 153-0064
Japan
0120 191014 or
[phone]
suppor[email protected]
Asia/Pacific:
Freescale Semiconductor China Ltd.
Exchange Building 23F
No. 118 Jianguo Road
Chaoyang District
Beijing 100022
China
[phone]
[e-mail]

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor iii
Contents
Paragraph
Number Title
Page
Number
Chapter 1
TWR-P1025 Overview
1.1 Introduction...................................................................................................................... 1-1
1.2 Contents ........................................................................................................................... 1-2
1.3 Features............................................................................................................................ 1-2
1.4 Getting Started ................................................................................................................. 1-4
1.5 Reference Documents ...................................................................................................... 1-4
Chapter 2
Power Requirements
2.1 Overview.......................................................................................................................... 2-1
Chapter 3
Hardware Description
3.1 P1025 Microprocessor ..................................................................................................... 3-1
3.2 Clocking........................................................................................................................... 3-2
3.3 System Power .................................................................................................................. 3-5
3.4 Debug Interface................................................................................................................ 3-5
3.5 Accelerometer.................................................................................................................. 3-5
3.6 Pushbutton and LEDs ...................................................................................................... 3-5
3.7 Ethernet............................................................................................................................ 3-5
3.8 USB.................................................................................................................................. 3-7
3.9 Micro Secure Digital Card Slot (micro SDHC)............................................................... 3-8
3.10 Local Bus Interface.......................................................................................................... 3-8
3.11 UART............................................................................................................................... 3-8
3.12 I2C ................................................................................................................................... 3-9
3.13 SPI.................................................................................................................................... 3-9
3.14 DDR3 ............................................................................................................................... 3-9
3.15 GPIO & Interrupts ......................................................................................................... 3-12
Chapter 4
Switch Table
4.1 P1025 Jumper Table......................................................................................................... 4-1

TWR-P1025 Hardware User Guide, Rev. 0
iv Freescale Semiconductor
Contents
Paragraph
Number Title
Page
Number
Chapter 5
Input/Output Connectors and Pin Usage Table
5.1 LED Usage....................................................................................................................... 5-1
5.2 I/O Connectors and Pin Usage Table ............................................................................... 5-1
Chapter 6
Tower Elevator Connections
6.1 Overview.......................................................................................................................... 6-1
Appendix A
Revision History
A.1 Version Number 0 ............................................................................................................ 7-1

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor v
Figures
Figure
Number Title
Page
Number
1-1 Freescale Tower System.......................................................................................................... 1-1
1-2 Callouts on front side of the TWR-P1025 .............................................................................. 1-3
1-3 Callouts on back side of the TWR-P1025............................................................................... 1-3
2-1 Power Supply Barrel Connector (J2) Polarity......................................................................... 2-1
3-1 TWR-P1025 Block Diagram................................................................................................... 3-1
3-2 P1025 Clocking Scheme ......................................................................................................... 3-3
3-3 eTSEC connection to AR8035 PHY....................................................................................... 3-6
3-4 NOR Local Bus Connection ................................................................................................... 3-8

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor vii
Tables
Table
Number Title
Page
Number
Tables
2-1 Power Distribution Summary.................................................................................................. 2-1
3-1 P1025 CCB to SYSCLK Ratio Selection ............................................................................... 3-4
3-2 P1025 e500 Core 0 & 1 to CCB Clock Ratio Selection.......................................................... 3-4
3-3 P1025 DDR Clock PLL Ratio................................................................................................. 3-4
3-4 CPU Speed Selection .............................................................................................................. 3-5
3-5 eTSEC1 PHY Connectivity .................................................................................................... 3-6
3-6 eTSEC1 PHY Connectivity .................................................................................................... 3-7
3-7 I2C1 Connectivity ................................................................................................................... 3-9
3-8 I2C2 Connectivity ................................................................................................................... 3-9
3-9 DDR3 Signals ....................................................................................................................... 3-10
3-10 P1025 Interrupt Usage .......................................................................................................... 3-13
3-11 P1025 GPIO Usage ............................................................................................................... 3-13
4-1 P1025 Jumper Table................................................................................................................ 4-1
5-1 LED Usage Table .................................................................................................................... 5-1
5-2 I/O Connectors and Pin Usage Table ...................................................................................... 5-1
6-1 TWR-P1025 Primary Connector Pinout ................................................................................. 6-1
6-2 TWR-P1025 Primary Connector Pinout ................................................................................. 6-4

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 1
Chapter 1
TWR-P1025 Overview
1.1 Introduction
The TWR-P1025 is a Tower Controller Module compatible with the Freescale Tower System. It can
function as a stand-alone, low-cost platform for the evaluation of the QorIQ P1xxx family of
microprocessor (MPU) devices. The TWR-P1025 features the QorIQ P1025 dual core processor based on
the PowerPC® e500 core architecture.
The TWR-P1025 is available as a stand-alone product or can be combined with the Tower Elevator
Modules (TWR-ELEV) and other Tower eco-system components to create development platforms for a
wide variety of applications. Figure 1-1 shows an overview of the Freescale Tower System.
Figure 1-1. Freescale Tower System

TWR-P1025 Overview
TWR-P1025 Hardware User Guide, Rev. 0
2Freescale Semiconductor
1.2 Contents
The TWR-P1025 contents include:
• TWR-P1025 board
• Quick Start Guide
1.3 Features
The features of the TWR-P1025 Tower MPU Module:
• Tower compatible microprocessor module
• Dual core P1025 in a 561 TEPBGA package operating up to 533 MHz
• P1025 JTAG
•CPLDJTAG
• Three axis accelerometer (MMA8451Q)
• Two (2) user-controllable LEDs
• One (1) reset pushbutton switch
• Ten-way DIP Switch for configuration
• microSD card slot
• mini-PCIe slot
• Two (2) 10/100/1000Mbps Ethernet RJ45
• Two (2) USB2.0 Type A
• One (1) mini-USB TypeB dual UART
• 512 MB DDR3@667 MHz
• 64 MB Flash
• IEEE1588 pinned to header + DAC and VXCO (DNP option)
Figure 1-2 and Figure 1-3 show the TWR-P1025 with some of the key features.

TWR-P1025 Overview
TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 3
Figure 1-2. Callouts on front side of the TWR-P1025
Figure 1-3. Callouts on back side of the TWR-P1025

TWR-P1025 Overview
TWR-P1025 Hardware User Guide, Rev. 0
4Freescale Semiconductor
1.4 Getting Started
Follow the printed Quick Start Guide or the interactive DVD contained in the TWR-P1025 box for
recommended get started steps.
1.5 Reference Documents
For more information on the QorIQ family, Tower System, and MPU Modules refer following documents:
• TWR-P1025-QSG: Quick Start Guide
• TWR-P1025-SCH: Schematics
• TWR-P1025-PWA: Design Package
• P1025 Reference Manual

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 1
Chapter 2
Power Requirements
2.1 Overview
The TWR-P1025 is designed to be externally powered through barrel connector J2 from a 5V@5A DC
supply. The barrel connector is manufactured by SWITCHCRAFT with part number RAPC722X. The
mating plug should have an inner diameter of 2.1mm and outer diameter of 5.5mm. Figure 2-1 shows the
polarity of the barrel connector.
Figure 2-1. Power Supply Barrel Connector (J2) Polarity
The 5V input is used to generate all voltages on the board. Additionally when used with TWR elevators
and other TWR peripherals, the TWR-P1025 provides 5V and 3.3V supplies.
There are several expansion options on the board that allow external boards to interface to the
TWR-P1025, such as the mini PCIe connector, USB ports and elevator expansion. As these plug in cards
have variable power requirements as well as numerous population combinations the Power capability of
the different expansion interfaces and the core board are listed in Table 2-1. Consideration of total available
power from the external supply should be considered when adding plug-in devices or using the elevator
expansion.
Table 2-1. Power Distribution Summary
Voltage (V) Current (A) Comment
Main Board 5 2.5A
MiniPCIe 3.3 1A
1.5 0.5
USB Port 1 5 0.5
USB Port 2 5 0.5
ELEVATORS 5 0.5
3.3 0.5

TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 1
Chapter 3
Hardware Description
The TWR-P1025 is a Tower Controller Module featuring the P1025-a dual core e500v2 based
microprocessor in a 561 TEPBGA package with a maximum core operating frequency of 533MHz. It is
intended to be used stand-alone or in the Freescale Tower System. Power is supplied through a 5V barrel
connector. Figure 3-1 shows a block diagram of the TWR-P1025. The following sections describe the
hardware in more detail.
Figure 3-1. TWR-P1025 Block Diagram
3.1 P1025 Microprocessor
The TWR-P1025 module features the P1025, the key features are:
• 533 MHz maximum core operating frequency
• 561 TEPBGA, 23mm x 23mm, 1.0mm pitch package

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
2Freescale Semiconductor
• Dual high-performance 32-bit cores, built on Power Architecture® technology:
— 32-bit e500v2 PowerPC core
— 36-bit physical addressing
— Double-precision floating-point support
— 32 Kbyte L1 instruction cache and 32 Kbyte L1 data cache for each core
— 400 MHz to 533 MHz clock frequency
• 256 Kbyte L2 cache with ECC. Also configurable as SRAM and stashing memory.
• Three 10/100/1000 Mbps enhanced three-speed Ethernet controllers (eTSECs)
— TCP/IP acceleration, quality of service, and classification capabilities
— IEEE® 1588 support
— Lossless flow control
— MII, RMII, RGMII, SGMII
• High-speed interfaces supporting various multiplexing options:
— Four SerDes upto 2.5 GHz/lane multiplexed across controllers
— Two PCI Express interfaces
— Two SGMII interfaces
• High-speed USB controller (USB 2.0)
— Host and device support
— Enhanced host controller interface (EHCI)
— ULPI interface to PHY
• Enhanced secure digital host controller (SD/MMC)
• Enhanced serial peripheral interface (eSPI)
• Integrated security engine
— Protocol support includes ARC4, 3DES, AES, RSA/ECC, RNG, single-pass SSL/TLS
— XOR acceleration
• 32-bit DDR3 SDRAM memory controller with ECC support
• Programmable interrupt controller (PIC) compliant with OpenPIC standard
• One four-channel DMA controller
• Two I2C controllers, DUART, timers
• Enhanced local bus controller (eLBC)
• QUICC Engine block
3.2 Clocking
The P1025 takes a single input clock, SYSCLK, as its primary clock source for the e500 cores and all of
the devices and interfaces that operate synchronously with the core. As shown in Figure 3-1, the SYSCLK
input (frequency) is multiplied up using a phase lock loop (PLL) to create the core complex bus (CCB)
clock (also called the platform clock). The CCB clock is used by virtually all of the synchronous system
logic, including the L2 cache, and other internal blocks such as the DMA and interrupt controller. The CCB

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 3
clock also feeds the PLLs in the e500 core and the PLL that create clocks for the integrated flash controller.
Note that the divide-by-two CCB clock divider and the divide-by-n CCB clock divider, shown in
Figure 3-2, are located in the DDR and IFC blocks, respectively.
A SYSCLK of 66.667 MHz will be the default used for the design. The board has been designed to support
Profibus applications that require 12 Mbps baud rate with 16x oversampling. A 64 MHz oscillator provides
the necessary BRG clock for this bit rate.
The DDR memory controller complex may use the platform clock or the DDRCLK, which is multiplied
up using a separate PLL to create a unique DDR memory controller complex clock. In this case, the DDR
complex operates asynchronous with respect to the platform clock and runs at a fixed data rate of
667MTps.
The clocks for the PCI Express and SGMII interfaces are derived from a PLL in the SerDes block. This
PLL is driven by a reference clock (SD_REF_CLK/SD_REF_CLK) whose input frequency is a function
of the bit rate being used (100 MHz or 125 MHz). Note that for proper PCI Express operation, the CCB
clock frequency must be greater than 62.5 MHz.
The Ethernet blocks operate asynchronously with respect to the rest of the device. These blocks use receive
and transmit clocks supplied by their respective PHY chips, plus a 125-MHz clock input for gigabit
protocols. Data transfers are synchronized to the CCB clock internally.
Figure 3-2. P1025 Clocking Scheme
Table 3-1 and Table 3-2 describe the CCB and core platform frequency ratio selection. Table 3-3 describes
the DDRCLK input ratio to DDR controller clock ratio.

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
4Freescale Semiconductor
Two DIP switches (SW1[7:8]) select the core/QE frequencies. Three modes run at 66.667MHz SYSCLK
whereas the 4th mode is for Profibus application and uses the 64 MHz SYSCLK.
The DDR runs at a fixed x10 multiplier to DDR_CLK.
Table 3-1. P1025 CCB to SYSCLK Ratio Selection
Functional Signals Reset Configuration Name Value CCB Clock : SYSCLK Ratio
LA[29:31] No Default cfg_sys_pll[0:2] 000 4:1
001 5:1
010 6:1
Table 3-2. P1025 e500 Core 0 & 1 to CCB Clock Ratio Selection
Functional Signals Reset Configuration
Name Value e500 Core: CCB Clock
Ratio
LBCTL, LALE,
LGPL2/LOE/LFRE
No Default
LWE0, UART_SOUT1,
READY_P1
No Default
cfg_core0_pll[0:2]
cfg_core1_pll[0:2]
000 Reserved
001 Reserved
010 1:1
011 3:2 (1.5:1)
100 2:1
101 5:2 (2.5:1)
110 3:1
111 Reserved
Table 3-3. P1025 DDR Clock PLL Ratio
Functional Signals Reset Configuration
Name Value e500 Core: CCB Clock Ratio
TSEC_1588_CLK_OUT,
TSEC_1588_PULSE_OUT1,
TSEC_1588_PULSE_OUT2
No Default
cfg_ddr_pll[0:2] 000 3:1
001 4:1
010 6:1
011 8:1
100 10:1
101 Reserved
110 Reserved
111 Synchronous mode

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 5
3.3 System Power
The TWR-P1025 is powered through a barrel connector that provides 5V to the board (and elevators if
present). All further operating voltages are generated via onboard regulators.
The power supply should be rated at 5V @5A.
3.4 Debug Interface
There are two JTAG connectors on board, one for the P1025 (J3) and another for the CPLD(J1). Both use
standard debuggers available from Freescale and Altera respectively. Pin 1 is marked on both connectors.
Refer to the relevant debug tool for operating instructions.
3.5 Accelerometer
An MMA8451Q digital accelerometer is connected to the P1025 through its second I2C interface at
address 0x1C and the accelerometers INT1 signal routed to the P1025 IRQ0.
3.6 Pushbutton and LEDs
The TWR-P1025 features one pushbutton switch connected to a reset circuit. Pressing this button initiates
the reset sequence in the CPLD and performs a HRESET sequence to the P1025 as well as resetting the
Ethernet PHYs, NOR Flash and USB circuitry.
Two LEDs are available to the user through software control. The P1025 GPIO pins, PB27 and PB31 are
routed through the CPLD to control these two LEDs.
3.7 Ethernet
The connectivity between the P1025 and the two Atheros AR8035 GETH PHYs is described in Table 3-5
& Table 3-6 and illustrated in Figure 3-3.
Table 3-4. CPU Speed Selection
CPU_SPEED
_SELECT0
SW1.7
CPU_SPEED_SELECT1
SW1.8
CORE(0 &1) Speed
(MHz)
QE Speed (MHz) SYSCLK (MHz)
ON ON 500 333 66.667
OFF ON 533 266 66.667
ON OFF 400 400 66.667
OFF OFF 384 384 64

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
6Freescale Semiconductor
Figure 3-3. eTSEC connection to AR8035 PHY
Table 3-5. eTSEC1 PHY Connectivity
P1025 Signal P1025
Pin P1025 Pin Type Description (for RGMII mode)
AR8035
Signal AR8035 Pin
EC_GTX_CLK125 AG25 Input Osc source for TX
clock. Can be
configured to feed
eTSEC1 and
eTSEC3
CLK_25M NA
TSEC1_TXD03 AC22 Output TX data bit TXD3 37
TSEC1_TXD02 AE27 Output TX data bit TXD2 36
TSEC1_TXD01 AB23 Output TX data bit TXD1 35
TSEC1_TXD00 AD25 Output TX data bit TXD0 34
TSEC1_TX_EN AD22 Output TX data
enabled/error
TX_CTL 32
TSEC1_GTX_CLK AF26 Output Inverted transmit
clock feedback
TX_CLK 33
TSEC1_RXD03 AC24 Input RX data bit RXD3 25
TSEC1_RXD02 AE23 Input RX data bit RXD2 26
TSEC1_RXD01 AG22 Input RX data bit RXD1 28
TSEC1_RXD00 AE24 Input RX data bit RXD0 29
TSEC1_RX_DV AE25 Input RX data
valid/error
RX_CTL 30
TSEC1_RX_CLK AE26 Input RX clock RX_CLK 31

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 7
3.8 USB
The P1025 features a USB full-speed/low-speed OTG/Host/Device controller. The controller connects to
the USB3300 USB PHY with the USB D+ and D- signals from the USB3300 routed to a four-port USB
EC_MDC AG19 Output Management
clock
MDC 40
EC_MDIO AF19 I/O Management
data
MDIO 39
Table 3-6. eTSEC1 PHY Connectivity
P1025 Signal P1025
pin P1025 Pin Type Description (for
RGMII mode)
AR8035
Signal AR8035 Pin
EC_GTX_CLK125 AG25 Input Osc source for TX
clock. Can be
configured to feed
eTSEC1 and
eTSEC3
-23
TSEC3_TXD03 AE22 Output TX data bit TXD3 37
TSEC3_TXD02 AF24 Output TX data bit TXD2 36
TSEC3_TXD01 AG26 Output TX data bit TXD1 35
TSEC3_TXD00 AF21 Output TX data bit TXD0 34
TSEC3_TX_EN AD27 Output TX data
enabled/error
TX_CTL 32
TSEC3_GTX_CLK AC26 Output Inverted transmit
clock feedback
TX_CLK 33
TSEC3_RXD03 AG24 Input RX data bit RXD3 25
TSEC3_RXD02 AG23 Input RX data bit RXD2 26
TSEC3_RXD01 AC20 Input RX data bit RXD1 28
TSEC3_RXD00 AC23 Input RX data bit RXD0 29
TSEC3_RX_DV AF27 I/O RX data
valid/error
RX_CT
L
30
TSEC3_RX_CLK AD24 Input RX clock RX_CL
K
31
EC_MDC AG19 Output Management
clock
MDC 40
EC_MDIO AF19 I/O Management
data
MDIO 39
Table 3-5. eTSEC1 PHY Connectivity (continued)
P1025 Signal P1025
Pin P1025 Pin Type Description (for RGMII mode)
AR8035
Signal AR8035 Pin

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
8Freescale Semiconductor
hub. Port2 is routed to the miniPCIe connector with Ports 3 & 4 routed to a dual USB type B connector
(J5). Both ports 3 & 4 can provide 5V@500mA to peripheral USB devices.
3.9 Micro Secure Digital Card Slot (micro SDHC)
A micro Secure Digital (SD) card slot is available on the TWR-P1025 connected to the SD Host Controller
(SDHC) signals of the P1025. Refer to Table 13 "I/O Connectors and Pin Usage Table" for the SDHC
signal connection details.
3.10 Local Bus Interface
The P1025 local bus interface is used for the NOR flash and elevator Local bus expansion. The local bus
is routed to the CPLD where the LAD lines are demultiplexed.
A Spansion SP29GL512S Flash providing 64Mbytes of memory is used on the P1025 Tower Module to
provide code storage for boot and application code. Some of the connections are direct between the
P1025's GPCM controlled memory controller and the Flash device. However the data bus is multiplexed
with the address bus, therefore a latch/mux is required. Typically this would be implemented in a separate
logic device, though the board contains a CPLD that has all these signals routed to it. The latch/mux logic
is implemented in the CPLD. The CPLD also drives reset to the Flash device at power up. The interconnect
between the devices is illustrated in Figure 3-4.
Additionally a subset of the local bus is routed from the CPLD to the primary elevator. This subset is
intended to be used as interface to the TWR-LCD panel.
Figure 3-4. NOR Local Bus Connection
3.11 UART
The two P1025 UARTs are routed to the FDTI dual USB to RS232 convertor. The UART is typically used
as a terminal on a remote host to provide input and output from the devices operating system, for example,
u-boot/Linux.

Hardware Description
TWR-P1025 Hardware User Guide, Rev. 0
Freescale Semiconductor 9
Serial connectivity for both P1025 cores is provided through the mini type B USB connector (labeled mini
USB UART in Figure 1-3). Note that the USB Drivers should be installed onto the host PC before the serial
terminal can be used. These can be downloaded from;
http://www.ftdichip.com/Drivers/VCP.htm (FT2232)
A serial terminal can be set up using a PC communication program such as hyper terminal set to 115200
Baud, 8 data bits, no parity, 1 stop bit. You should select the first COM port assigned to the USB UART
Virtual COM port.
3.12 I2C
There are two I2C buses on the P1025, I2C1 and I2C2. I2C1 is intended for Boot Sequencer operation.
I2C2 is used for peripherals. Table 3-7 & Table 3-8 list the I2C devices attached to each bus.
3.13 SPI
The P1025 SPI is used to control the optional 50 MHz VXCO (DNP by default) and is also routed to the
tower primary elevator.
3.14 DDR3
512 MBytes of memory is connected to the P1025 32-bit DDR3 controller. The 512 MByte comprises of
two 128 Mbit x 32 bits x 8 banks (2-Gbit) devices (Micron MT41J128M16HA-125G).
The DDR3-SDRAM is configured with 14 row address lines, 10 column address lines, and 8 banks.
Control of each memory device is through the CS0 signal. Individual differential clocks and their
associated enable signal are routed to each memory.
Every DDR3 signal can be considered to be a member of one of four separate groups. Each group has
unique rules in terms of signal connection and signal routing. The four groups and connectivity between
controller and Memory are shown in Table 3-9.
Table 3-7. I2C1 Connectivity
Address Device
0x50 M24256-BWDW6TP 2K EEPROM (16-bit address)
Table 3-8. I2C2 Connectivity
Address Device
0x1C MMA8451Q 3 Axis accelerometer
0x23 GPIO expander
0x52 AT24C01B 1K Board EEPROM (8-bit address)
TBD Primary elevator
TBD miniPCIe Slot