Alinx ARTIX-7 FPGA User manual

ARTIX-7 FPGA
Development Board
AC7100B
System on Module

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Version Record
Version
Date
Release By
Description
Rev 1.0
2020-10-28
Rachel Zhou
First Release

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Table of Contents
Version Record.......................................................................................................2
Part 1: AC7100B Core Board Introduction........................................................4
Part 2: FPGA Chip................................................................................................. 6
Part 3: Active Differential Crystal........................................................................ 8
Part 3.1: 200Mhz Active Differential clock.................................................8
Part 3.2: 148.5Mhz Active Differential Crystal..........................................9
Part 4: DDR3 DRAM........................................................................................... 11
Part 5: QSPI Flash.............................................................................................. 15
Part 6: LED Light on Core Board......................................................................17
Part 7: Reset Button............................................................................................18
Part 8: JTAG Interface........................................................................................ 19
Part 9: Power Interface on the Core Board.................................................... 20
Part 10: Board to Board Connectors pin assignment................................... 21
Part 11: Power Supply........................................................................................ 28
Part 12: Structure Diagram................................................................................30

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Part 1: AC7100B Core Board Introduction
AC7100B (core board model, the same below) FPGA core board, it is
based on XILINX's ARTIX-7 series 100T XC7A100T-2FGG484I. It is a
high-performance core board with high speed, high bandwidth and high
capacity. It is suitable for high-speed data communication, video image
processing, high-speed data acquisition, etc.
This AC7100B core board uses two pieces of MICRON's
MT41J256M16HA-125 DDR3 chip, each DDR has a capacity of 4Gbit; two
DDR chips are combined into a 32-bit data bus width, and the read/write data
bandwidth between FPGA and DDR3 is up to 25Gb; such a configuration can
meet the needs of high bandwidth data processing.
The AC7100B core board expands 180 standard IO ports of 3.3V level, 15
standard IO ports of 1.5V level, and 4 pairs of GTP high speed RX/TX
differential signals. For users who need a lot of IO, this core board will be a
good choice. Moreover, the routing between the FPGA chip and the interface is
equal length and differential processing, and the core board size is only 45*55
(mm), which is very suitable for secondary development.

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Figure 1-1: AC7100B Core Board (Front View)
Figure 1-2: AC7100B Core Board (Rear View)

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Part 2: FPGA Chip
As mentioned above, the FPGA model we use is XC7A100T-2FGG484I,
which belongs to Xilinx's Artix-7 series. The speed grade is 2, and the
temperature grade is industry grade. This model is a FGG484 package with
484 pins. Xilinx ARTIX-7 FPGA chip naming rules as below
Figure 2-1: The Specific Chip Model Definition of ARTIX-7 Series
Figure 2-2: FPGA chip on board
The main parameters of the FPGA chip XC7A100T are as follows
Name
Specific parameters
Logic Cells
101440
Slices
15850
CLB flip-flops
126800
Block RAM（kb）
4860

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DSP Slices
240
PCIe Gen2
1
XADC
1 XADC, 12bit, 1Mbps AD
GTP Transceiver
4 GTP, 6.6Gb/s max
Speed Grade
-2
Temperature Grade
Industrial
FPGA power supply system
Artix-7 FPGA power supplies are VCCINT, VCCBRAM, VCCAUX, VCCO, VMGTAVCC and
VMGTAVTT. VCCINT is the FPGA core power supply pin, which needs to be connected
to 1.0V; VCCBRAM is the power supply pin of FPGA block RAM, connect to 1.0V;
VCCAUX is FPGA auxiliary power supply pin, connect 1.8V; VCCO is the voltage of
each BANK of FPGA, including BANK0, BANK13~16, BANK34~35. On
AC7100B FPGA core board, BANK34 and BANK35 need to be connected to
DDR3, the voltage connection of BANK is 1.5V, and the voltage of other BANK
is 3.3V. The VCCO of BANK15 and BANK16 is powered by the LDO, and can
be changed by replacing the LDO chip. VMGTAVCC is the supply voltage of
the FPGA internal GTP transceiver, connected to 1.0V; VMGTAVTT is the
termination voltage of the GTP transceiver, connected to 1.2V.
The Artix-7 FPGA system requires that the power-up sequence be
powered by VCCINT, then VCCBRAM, then VCCAUX, and finally VCCO. If
VCCINT and VCCBRAM have the same voltage, they can be powered up at
the same time. The order of power outages is reversed. The power-up
sequence of the GTP transceiver is VCCINT, then VMGTAVCC, then
VMGTAVTT. If VCCINT and VMGTAVCC have the same voltage, they can be
powered up at the same time. The power-off sequence is just the opposite of
the power-on sequence.

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Part 3: Active Differential Crystal
The AC7100B core board is equipped with two Sitime active differential
crystals, one is 200MHz, the model is SiT9102-200.00MHz, the system main
clock for FPGA and used to generate DDR3 control clock; the other is 125MHz,
model is SiT9102 -125MHz, reference clock input for GTP transceivers.
Part 3.1: 200Mhz Active Differential clock
G1 in Figure 3-1 is the 200M active differential crystal that provides the
development board system clock source. The crystal output is connected to the
BANK34 global clock pin MRCC (R4 and T4) of the FPGA. This 200Mhz
differential clock can be used to drive the user logic in the FPGA. Users can
configure the PLLs and DCMs inside the FPGA to generate clocks of different
frequencies.
Figure 3-1: 200Mhz Active Differential Crystal Schematic

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Figure 3-2: 200Mhz Active Differential Crystal on the Core Board
200Mhz Differential Clock Pin Assignment
Signal Name
FPGA PIN
SYS_CLK_P
R4
SYS_CLK_N
T4
Part 3.2: 148.5Mhz Active Differential Crystal
G2 in Figure 3-3 is the 148.5Mhz active differential crystal, which is the
reference input clock provided to the GTP module inside the FPGA. The crystal
output is connected to the GTP BANK216 clock pins MGTREFCLK0P (F6) and
MGTREFCLK0N (E6) of the FPGA.

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Figure 3-3: 148.5Mhz Active Differential Crystal Schematic
Figure 3-4: 1148.5Mhz Active Differential Crystal on the Core Board
125Mhz Differential Clock Pin Assignment
Net Name
FPGA PIN
MGT_CLK0_P
F6
MGT_CLK0_N
E6