FRONTGRADE GR740-MINI User manual

Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
[phone] | frontgrade.com/gaisler
GR740-MINI
Development Board
GR740-MINI-UM
Dec 2023, Version 1.1
GR740-MINI Board User’s Manual
Dec 2023, Version 1.1
USER'S MANUAL

Kungsgatan 12 | SE-411 19 Goteborg | Sweden
[phone] | frontgrade.com/gaisler
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
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Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
[phone] | frontgrade.com/gaisler
GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
TABLE OF CONTENTS
1Introduction..............................................................................................................................................................4
1.1 Purpose and Scope of the Document .........................................................................................................4
1.2 Reference Documents ...................................................................................................................................4
2Abbreviations ..........................................................................................................................................................5
3GR740-Mini-board Design .................................................................................................................................... 6
3.1 Overview .......................................................................................................................................................... 6
3.2 Handling...........................................................................................................................................................7
4Board design ...........................................................................................................................................................8
4.1 Board block diagram ......................................................................................................................................9
4.2 Power the board ...........................................................................................................................................10
4.3 Interacting with the board ............................................................................................................................ 11
4.4 Power supplies..............................................................................................................................................12
4.5 FTDI chip ....................................................................................................................................................... 13
4.6 Reset ..............................................................................................................................................................14
4.7 GR740 Processor .........................................................................................................................................15
4.7.1 Bootstrap signals .................................................................................................................................16
4.7.2 Debugging.............................................................................................................................................17
4.7.3 LED ........................................................................................................................................................18
4.7.4 JTAG ......................................................................................................................................................18
4.7.5 WDOGN ................................................................................................................................................19
4.7.6 Oscillators and clock input..................................................................................................................20
4.7.7 SDRAM.................................................................................................................................................. 21
4.7.8 PROM....................................................................................................................................................22
4.7.9 Ethernet................................................................................................................................................. 23
4.7.10 SpaceWire ............................................................................................................................................ 24
4.7.11 GPIO...................................................................................................................................................... 24
4.8 CertusPro-NX FPGA....................................................................................................................................25
4.8.1 Configurate and programming ...........................................................................................................26
4.8.2 LED ........................................................................................................................................................27
4.8.3 JTAG ......................................................................................................................................................28
4.8.4 SPI FLASH............................................................................................................................................28
4.8.5 Oscillators and clocks input................................................................................................................29
4.8.6 DDR3 Memory...................................................................................................................................... 30
4.8.7 Ethernet................................................................................................................................................. 31
4.8.8 SerDes...................................................................................................................................................32
4.9 Intercommunication between GR740 and CertusPro-NX.......................................................................33
4.9.1 PCI .........................................................................................................................................................33
4.9.2 GMII/MII................................................................................................................................................. 34
4.9.3 SpaceWire ............................................................................................................................................ 36
4.10 FMC+ connector ...........................................................................................................................................37
Revision information ......................................................................................................................................................42
Disclaimer........................................................................................................................................................................43
Appendix A......................................................................................................................................................................44
Appendix B......................................................................................................................................................................45
Appendix C......................................................................................................................................................................46

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Kungsgatan 12 | SE-411 19 Goteborg | Sweden
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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
List of Figures
Figure 3-1 GR740-MINI Development board.............................................................................................. 6
Figure 4-1 Top view of GR740-MINI board ................................................................................................. 8
Figure 4-2 GR740-MINI Board block Diagram............................................................................................. 9
Figure 4-3 USB-C connector for power supply soluon............................................................................ 10
Figure 4-4 Jumper Conguraon .............................................................................................................. 11
Figure 4-5 LED(1-3) board placement....................................................................................................... 11
Figure 4-6 Power Regulaon Scheme....................................................................................................... 12
Figure 4-7 Implementaon of voltage sequencer.................................................................................... 14
Figure 4-8 GR740 SOC Block Diagram....................................................................................................... 15
Figure 4-9 GR740 Package ........................................................................................................................ 15
Figure 4-10 Bootstrap signals ..................................................................................................................... 16
Figure 4-11 LED(4 -10) board placement.................................................................................................... 18
Figure 4-12 GR740 Clock Distribuon scheme ........................................................................................... 20
Figure 4-13 Implementaon for SDRAM..................................................................................................... 21
Figure 4-14 Implementaon of PROM memory ......................................................................................... 22
Figure 4-15 ETH0 implementaon.............................................................................................................. 23
Figure 4-16 GPIO for GR740........................................................................................................................ 24
Figure 4-17 CertusPro-NX implementaon ................................................................................................ 25
Figure 4-18 Programming the FPGA ........................................................................................................... 26
Figure 4-19 LED(11-15) and D8 board placement ...................................................................................... 27
Figure 4-20 SPI Flash implementaon ........................................................................................................ 28
Figure 4-21 CertusPro-NX Clock Distribuon scheme ................................................................................ 29
Figure 4-22 CertusPro-NX DDR3 memory implementaon........................................................................ 30
Figure 4-23 Ethernet implementaon ........................................................................................................ 31
Figure 4-24 SerDes implementaon........................................................................................................... 32
Figure 4-25 PCI interface............................................................................................................................. 33
Figure 4-26 GMII/MII Intercommunicaon ................................................................................................ 34
Figure 4-27 SpaceWire Implementaon on the FPGA................................................................................ 36
Figure 4-28 SpaceWire Implementaon on the GR740.............................................................................. 36
Figure 4-29 FMC+ connector scheme......................................................................................................... 37
List of Tables
Table 4-1 Power and status LED .................................................................................................................. 11
Table 4-2 Voltages ....................................................................................................................................... 13
Table 4-3 FTDI Port assignment................................................................................................................... 13
Table 4-4 Default bootstrap values ............................................................................................................. 17
Table 4-5 LED correspond the GR740.......................................................................................................... 18
Table 4-6 LED correspond the CertusPro-NX............................................................................................... 27
Table 4-7 Shared pins on GR740 for PCI and Ethernet interface................................................................. 34
Table 4-8 Pinout for FMC+ connector ......................................................................................................... 38

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Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
[phone] | frontgrade.com/gaisler
GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
1 INTRODUCTION
1.1 Purpose and Scope of the Document
This document provides a User’s Manual and interface document for the GR740-MINI development board.
The work has been performed at Frontgrade Gaisler AB, Gothenburg, Sweden.
1.2 Reference Documents
The following documents are referred as they contain relevant informaon:
[RD1] GR740MINI-QSG.pdf, Quick Start Guide, available from
https://www.gaisler.com/gr740-mini
[RD2] “GR740 user manual and data sheet”, available from
https://www.gaisler.com/GR740
[RD3] GRMON3 User Manual, available from https://www.gaisler.com/GRMON3
[RD4] “CertusPro-NX Family, Data Sheet”, Document number: FPGA-DS-02086
available from https://www.latticesemi.com
[RD5] “sysCONFIG User Guide for Nexus Platform, Technical Note”, Document
number: FPGA-TN-02099-2.5, available from https://www.latticesemi.com/
[RD6] “CertusPro-NX High-Speed I/O Interface, Technical Note”, Document number:
FPGA-TN-02244-1.1, available from https://www.latticesemi.com/

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Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
2 ABBREVIATIONS
AHB
Advanced High-performance bus, part of [AMBA]
AMBA
Advanced Microcontroller Bus Architecture
APB
Advanced Peripheral Bus, part of [AMBA]
DDR3
Double Data Rate
DSU
Debug Support Unit
EDAC
Error Detection and Correction
ESD
Electro-Static Discharge
FMC
FPGA Mezzanine Card
FPGA
Field Programmable Logic Array
FTDI
Future Technology Devices International
GMII
Gigibit Media Independent Interface
GPIO
General Purpose Input / Output
HCSL
High speed Current Steering Logic
HPC
High Pin Count
I2C
Inter-Integrated Circuit
IP
Intellectual Property
JTAG
Joint Test Action Group
LPC
Low Pin Count
LVDS
Low-Voltage Differential Signaling
MII
Media Independent Interface
SDRAM
Random Access Memory
SPI
Serial Peripheral Interface
PCB
Printed Circuit Board
PCI
Peripheral Component Interconnect
PHY
Physical Layer Device
PLL
Phase Locked Loop
PROM
Programmable Read Only Memory
UART
Universal Asynchronous Receiver Transmitter
USB
Universal Serial Bus

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Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
[phone] | frontgrade.com/gaisler
GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
3 GR740-MINI-BOARD DESIGN
3.1 Overview
This document describes the design and implementaon of the GR740-MINI board. There is also a Quick
Start Guide [RD1] available, describing used commands and syntax etc. for debugging and development.
The GR740-MINI board is a compact evaluaon plaorm built around the Frontgrade GR740 quad-core
LEON4FT SPARC V8 processor and Lace Semiconductor FPGA CertusPro-NX. The board is designed with
mulple electrical funcons and interfaces with gives the user a exibility to interact with the board.
Figure 3-1 GR740-MINI Development board

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Frontgrade Gaisler AB
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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
The board contains the following main items.
•2 x USB-C connectors for debug and power
•GR470 Processor
o1 x USB interface via FTDI FT4232 providing JTAG and UART
o1 x Ethernet for communicaon and debug
o4 x SpaceWire channels to FMC+ connector
o256MB SDRAM
o128MB FLASH
•CertusPro-NX FPGA
o1 x USB interface via FTDI FT4232 providing JTAG and UART
o1 x Ethernet for communicaon and debug
o4 x SerDes to FMC+ connector
oLVDS to FMC+ connector
o3V3 IO to FMC+ connector
oI2C link to FMC+ connector
o1GB DDR3 memory
o512Mb SPI FLASH
•Intercommunicaon between GR740 and CertusPro-NX
oPCI link (32bit, 33MHz)
oGMII/MII
o4 x SpaceWire channels
3.2 Handling
This unit contains sensive electronic components which can be damaged by Electrostac Discharges (ESD).
When handling or installing the unit observe appropriate precauons and ESD safe pracces.
When not in use, store the unit in an electrostac protecve container or bag.
When conguring the jumpers on the board, or connecng/disconnecng cables, ensure that the unit is in
an un-powered state.
When operang the board in a 'stand-alone' conguraon, the power supply should be current limited to
prevent damage to the board or power supply in the event of an overcurrent situaon.
This equipment has SpaceWire ports that use Low Voltage Dierenal Signalling (LVDS) which has limited
common mode voltage protecon. To avoid damage to the SpaceWire interfaces due to common mode
voltage see secon 4.10 FMC+ connector

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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
4 BOARD DESIGN
This secon describes the board design in detail. The electrical funcons and interfaces that are common
for both the devices (the processor and the FPGA) are described in the rst secons: 4.1 to 4.6. In secon
4.7 and 4.8 each device and corresponding funcons/interfaces are described. The intercommunicaon be-
tween the devices is described in secon 4.9 and the FMC+ connector in secon 4.10.
Note: This design is not aimed for ight and should not be used as a reference design.
Figure 4-1 Top view of GR740-MINI board
Figure 4-1 shows the top view for the GR740-MINI board and is marked with interacons and indicaons.
For a more detailed assembly drawing referring to Appendix A & B.

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Frontgrade Gaisler AB
Kungsgatan 12 | SE-411 19 Goteborg | Sweden
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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
4.1 Board block diagram
The GR740-MINI Development Board provides the electrical funcons and interfaces as represented in the
block diagram in Figure 4-2.
Figure 4-2 GR740-MINI Board block Diagram
There are mulple ways to communicate with the board, in Figure 4-2 the interfaces are represented as
grey boxes and described shortly below.
1. USB 2.0: The USB 2.0 link is connected to a FTDI chip that converts the USB-data into four serial out-
puts (2 x JTAG and 2 x UART) connected to both the FPGA and Processor. USB 2.0 interface is con-
nected to connector J2.
2. Ethernet: Both MII and GMII interface are supported by the FPGA and processor through J3.Where
J3A is to CertusPro-NX and J3B to the GR740.
3. FMC+ connector: the usage of the FMC+ connector is dependent on an external mezzanine board.
In this design the FMC+ connector provides the GR740 with four SpaceWire channels and the Cer-
tusPro-NX with SerDes LVDS, I2C and GPIO 3V3.

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GR740-MINI
GR740-MINI-UM
Dec 2023, Version 1.1
4.2 Power the board
The GR740-MINI board is powered using either of the USB-C connectors (J1 or J2). Therefor there are two
ways to power supply the board and which is accomplished by aaching a 2-pin jumper to the 3-pin head
(JP5), see Figure 4-3
The overall power requirement for the board is 15W. J2 is considered as the main power supply, and the
conguraon jumper is set to this as default (JP5: 1-2). This can be used when communicang with USB-C
(data and power through the same cable), Ethernet or FMC+ connector. The USB-C source must handle at
least 3A, 5V (15W). J2 must be inserted to start up the board since the D_N/P signals are needed to the FTDI
chip see Figure 4-3.
There is only one excepon when there is need to use J1 as power source. This is when the user is com-
municang with USB and the USB-source (for example a computer or a docking staon) cannot handle the
power requirements. Then, the users need to have an external power source connected to J1 and the data
to J2, this conguraon is chosen when seng jumper in JP5: 2-3 mode.
Figure 4-3 USB-C connector for power supply solution
Note: that the source (for example a computer, charger or docking staon) used in this case must have
a USB-C connector that can deliver at least 3A, 5V (15W). Observe that not all sources with USB-C
sockets support that. Check the sources manual before connecng to the GR740-MINI board.