System Ace Controller; Zbt Synchronous Sram - Xilinx ML405 User Manual

R

17. System ACE Controller

The Xilinx System ACE CF configuration controller allows a Type I or Type II
CompactFlash card to program the FPGA through the JTAG port. Both hardware and
software data can be downloaded through the JTAG port. The System ACE controller can
support up to eight configuration images on a single CompactFlash card. The
configuration address pushbutton switches allow the user to choose which of the eight
configuration images to use.
System ACE error and status LEDs indicate the operational state of the System ACE
controller:
•
•
•
•
Every time a CompactFlash card is inserted into the System ACE socket, a configuration
operation is initiated. Pressing the System ACE reset pushbutton switch reprograms the
FPGA.
The board also features a System ACE failsafe mode. In this mode, if the System ACE
controller detects a failed configuration attempt, it automatically reboots back to a
predefined configuration image. The failsafe mode is enabled by inserting two jumpers
across J29 and J30 (in horizontal or vertical orientation).
The System ACE MPU port is connected to the FPGA. This allows the FPGA to control the
System ACE chip and use it 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.
For configuration through the System ACE controller, the configuration selector switch
(SW12) must be set to the SYS ACE position.

18. ZBT Synchronous SRAM

The ZBT synchronous SRAM (Cypress CY7C1354B or compatible) provides high-speed,
low-latency external memory to the FPGA. The memory is organized as 256K x 36 bits.
This provides for a 32-bit data bus with support for four parity bits.
The SRAM and FLASH memory share the same data bus. The parity bits are not available
on the ML405 board.
ML405 Evaluation Platform
UG210 (v1.5.1) March 10, 2008
A blinking red error LED indicates that no CompactFlash card is present
A solid red error LED indicates an error condition during configuration
A blinking green status LED indicates a configuration operation is ongoing
A solid green status LED indicates a successful download
Caution!
Insert or remove the CompactFlash card only when the board power is off. Use
caution when inserting a CompactFlash card with exposed metallic surfaces. Inserting the card
incorrectly can cause a short with the traces or components on the board.
www.xilinx.com
Detailed Description
23