Chapter 11: Jtag Programming/Debugging Ports; Jtag Header (J7) - Xilinx Spartan-3 User Manual

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JTAG Programming/Debugging Ports
The Spartan-3 Starter Kit board includes a JTAG programming and debugging chain. Both
the Spartan-3 FPGA and the Platform Flash devices are part of the JTAG chain, as shown in
Figure
various supported JTAG download and debugging cables. A Digilent JTAG3 low-cost
parallel to JTAG cable is included as part of the kit and connects to the J7 header.

JTAG Header (J7)

This J7 JTAG header consists of 0.1-inch stake pins and is indicated as
located toward the top edge of the board, directly below the two expansion connectors.
The Digilent low-cost parallel port to JTAG cable fits directly over the J7 header stake pins,
as shown in
Make sure that the signals at the end of the JTAG cable align with the labels listed on the
board. The other end of the Digilent cable connects to the PC's parallel port. The Digilent
cable is directly compatible with the Xilinx iMPACT software. The schematic for the
Digilent cable appears in
Spartan-3 Starter Kit Board User Guide
UG130 (v1.1) May 13, 2005
11-1. Additionally, there are two JTAG headers for driving the JTAG signals from
Digilent Parallel
JTAG3 Cable IV
Parallel MultiPro
Cable 3 Desktop
Tool
Header Header
J7 J5
22 24
10
2
1 4
4 6
5 8
x Header pin number
Figure 11-1: Spartan-3 Starter Kit Board JTAG Chain
Figure 11-2. When properly fitted, the cable is perpendicular to the board.
Spartan-3 FPGA
(XC3S400FT256C)
TDI
TMS
TCK
Figure A-9.
www.xilinx.com
1-800-255-7778
Chapter 11
PlatformFlash
(XCF02S)
TDO TDI
TMS
TCK
in
22
TDO
UG130_c11_01_042504
Figure 1-2,
41