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Chapter 1: Introduction
Table 1-28:
FPGA DDR2 Interface Pin Assignments (Cont’d)
R
FPGA Pin
L18
Y22
U21
Y20
Y23
Description
DDR2_0_DQS3_P
DDR2_0_ODT_0
DDR2_0_ODT_1
DDR2_0_RAS_B
DDR2_0_CKE_0
FPGA Pin
H24
W20
V18
T20
Y25
Description
DDR2_LOOP_IN
DDR2_0_S0
DDR2_0_S1
DDR2_0_WE_B
DDR2_0_CKE_1
3. System ACE Controller
The Xilinx System ACE controller allows a type I CompactFlash card to program the
FPGA through the JTAG port. The System ACE controller supports up to eight
configuration images on a single CompactFlash card. The configuration address DIP
switches (332 on the top of the board) allow you to select what configuration image to
use.
System ACE error and status LEDs indicate the operational state of the System ACE
controller:
?
?
?
?
The DS19 LED blinks green to indicate that no CompactFlash card is present.
The DS19 LED lights green to indicate an error during configuration.
The DS18 LED blinks green to indicate an ongoing configuration operation.
The DS18 LED lights green to indicate a successful download.
Every time that a CompactFlash card is inserted in the CompactFlash reader, a
configuration operation is initiated. Pressing the System ACE reset button (S9)
reprograms the FPGA.
The FPGA pins used for the USB interface are shared with the System ACE interface.
See the FPGA pin assignments on Table 1.
Note : Configuration with the System ACE controller is enabled with the configuration
DIP switches.
The board also features a System ACE failsafe mode. Under this mode, if the System
ACE controller detects a failed configuration attempt, it automatically restarts under a
predefined configuration image. The failsafe mode is enabled by inserting two
jumpers across JP7 and JP8 (horizontally or vertically).
Caution : Exercise caution when handling a CompactFlash card in the vicinity of the
board, as contact between the card's metallic parts and board components could create
short-circuits.
The System ACE MPU port is connected to the FPGA. This connection allows the
FPGA to use the System ACE controller to reconfigure the system or access the
CompactFlash card as a generic FAT file system. The data bus for the System ACE
MPU port is shared with the USB controller.
4. CompactFlash Reader
The CompactFlash reader is used as an interface point between the Spartan-3A DSP
3400A Edition board and a CompactFlash card. The CompactFlash card used is
generally a Lexar Media 512-MB module.
40
www.xilinx.com
Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
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