Hardware User Guide
1-18
Xilinx Development System
XChecker Baud Rates
Communication between your host system and the XChecker Cable
is dependent on host system capability. The XChecker Cable supports
several Baud rates and platforms, as shown in the following table.
Configuring CPLDs With the XChecker Cable
The JTAG Programmer should be used to program in JTAG mode.
When you configure a CPLD with the XChecker Cable, connections
between the cable assembly and the target system use only six of the
sixteen leads. For connection to JTAG boundary-scan systems you
need only ensure that the VCC, GND, TDI, TCK, TMS and RD (TDO)
pins are connected.
Note
TRST is an optional pin in the JTAG (IEEE 1149.1) specification,
and is not used by XC9500 CPLDs (If any of your non-Xilinx parts
have a TRST pin, the pin should be connected to VCC).
Once installed properly, the connectors provide power to the cable
and allow download and readback of configuration data. The
following table describes the CPLD pin connections to the target
circuit board.
Table 1-4 Valid Baud Rates
Platform
9600
19200
38400
115.2K
IBM® PC
X
X
X
X
NEC PC
X
SUN®
X
X
X
HP 700
X
X
X
X
X indicates applicable baud rate
Table 1-5 XChecker Cable Pin Connections for CPLDs
Name
Function
Connections
VCC
Power – Supplies VCC (5
V, 100 mA, typically) to the
cable
To target system VCC
GND
Ground – Supplies ground
reference to the cable
To target system
ground