Other Expansion I/O Connectors - Xilinx ML50 Series User Manual

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Table 1-10: Expansion I/O Single-Ended Connections (J6) (Continued)

Other Expansion I/O Connectors

In addition to the high-speed I/O paths, additional I/O signals and power connections are
available to support expansion cards plugged into the ML501 board. Fourteen I/O pins
from the general-purpose pushbutton switches and LEDs on the board are connected to
expansion connector J5. This permits additional I/Os to connect to the expansion
connector if the pushbutton switches and LEDs are not used. The connection also allows
the expansion card to utilize the pushbutton switches and LEDs on the board.
The expansion connector also allows the board's JTAG chain to be extended onto the
expansion card by setting jumper J21 accordingly.
The IIC bus on the board is also extended onto the expansion connector to allow additional
IIC devices to be bused together. If the expansion IIC bus is to be utilized, the user must
have the IIC pull-up resistors present on the expansion card. Bidirectional level shifting
transistors allow the expansion card to utilize 2.5V to 5V signaling on the IIC bus.
Power supply connections to the expansion connectors provide ground, 2.5V, 3.3V, and 5V
power pins. If the expansion card draws significant power from the ML501 board, ensure
that the total power draw can be supplied by the board.
The ML501 expansion connector is backward compatible with the expansion connectors
on the ML40x, ML32x, and ML42x boards, thereby allowing their daughter cards to be
used with the ML501 Evaluation Platform.
expansion I/O connections.
ML501 Evaluation Platform
UG226 (v1.3) November 10, 2008
J6 Pin Schematic Net Name
56 HDR1_56
58 HDR1_58
60 HDR1_60
62 HDR1_62
64 HDR1_64
www.xilinx.com
Detailed Description
FPGA Pin
Y26
P26
AA25
AC26
AB26
Table 1-11, page 24 summarizes the additional
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