J20 Header; Digilent Peripheral Modules - Xilinx Spartan-3A User Manual

Chapter 15: Expansion Connectors

J20 Header

The J20 header, shown in
edge of the board. It uses a female six-pin 90° socket. Four FPGA pins connect to the J20
header, J20_IO<4:1>. The board supplies 3.3V to the accessory board mounted in the J20
socket on the bottom pin.

Digilent Peripheral Modules

Digilent Peripheral Modules (PMODs) are small I/O interface boards that offer an ideal
way to extend the capabilities of programmable logic and embedded control boards. They
allow sensitive signal conditioning circuits and high-power drive circuits to be placed
where they are most effective - near sensors and actuators. PMODs communicate with
system boards using six-wire cables that can carry up to four digital control signals,
including SPI and other serial protocols. PMODs allow more effective design partitions by
routing analog signals and power supplies only where they are needed and away from
digital controller boards.
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132
Figure
Figure 15-10: FPGA Connections to the J20 Accessory Header
Digilent, Inc. Peripheral Modules
http://www.digilentinc.com/Products/Catalog.cfm?Cat=Peripheral
www.xilinx.com
15-10, is the top-most six-pin connector along the right
J20
FPGA
J20_IO1
(V14)
J20_IO2
(V15)
J20_IO3
(W16)
J20_IO4
(V16)
GND
3.3V
UG334_c15_10_052407
Spartan-3A/3AN Starter Kit Board User Guide
R
UG334 (v1.0) May 28, 2007