Configuration Options; Jtag (Xilinx Download Cable And System Ace Controller) Configuration - Xilinx ML50 Series User Manual

Chapter 1: ML501 Evaluation Platform

Configuration Options

The FPGA on the ML501 Evaluation Platform can be configured by five major devices:
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The following section provides an overview of the possible ways the FPGA can be
configured.

JTAG (Xilinx Download Cable and System ACE Controller) Configuration

The FPGA, Platform Flash PROM, and CPLD can be configured through the JTAG port.
The JTAG chain of the board is illustrated in
The chain starts at the PC4 connector and goes through the System ACE controller, the
Platform Flash PROM, the FPGA, the CPLD, and an optional extension of the chain to the
expansion card. Jumper J21 determines if the JTAG chain should be extended to the
expansion card.
The JTAG chain can be used to program the FPGA and access the FPGA for hardware and
software debug. The JTAG chain is also used to program the Platform Flash PROM and the
CPLD.
The PC4 JTAG connection to the JTAG chain allows a host computer to download
bitstreams to the FPGA using the iMPACT software tool. PC4 also allows debug tools such
as the ChipScope™ Pro Analyzer or a software debugger to access the FPGA.
The System ACE controller can also program the FPGA through the JTAG port. Using an
inserted CompactFlash card, configuration information can be stored and played out to
the FPGA. The System ACE controller supports up to eight configuration images that can
selected using the three configuration address DIP switches. Under FPGA control, the
System ACE chip can be instructed to reconfigure to any of the eight configuration images.
The configuration mode should be set to 101. Jumper J21 should exclude the expansion
card from the JTAG chain, and switch SW15, pin 8 should be ON to use System ACE
configuration. When set correctly, the System ACE controller programs the FPGA upon
power-up if a CompactFlash card is present or whenever a CompactFlash card is inserted.
Pressing the System ACE reset button also causes the System ACE controller to program
the FPGA if a CompactFlash card is present.
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Xilinx download cable (JTAG)
System ACE controller (JTAG)
Platform Flash PROM
Linear Flash memory
SPI Flash memory
Platform Flash
CPLD
Memory
TDI TDO TDI
J1
www.xilinx.com
Figure 1-5.
System ACE
Controller
TDO TSTTDI CFGTDO
TSTDO CFGTDI
Figure 1-5: JTAG Chain
FPGA Expansion
TDI TDO TDI
1
2
TDO
3
J21
UG226_05_082906
ML501 Evaluation Platform
UG226 (v1.3) November 10, 2008
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