Jtag Cable

There are three cables available for usewith the JTAG Programmer. The first is an RS232 serial cable known as the XChecker Cable. The second is the Parallel Download Cable which can be connected to a PC’s parallel printer port. The third is theMultiLINX cable which can be connected to a USB port (Windows 98 only) or serial port. There are a few advantages to be considered in selecting a cable:

• The XChecker Cable or Multilinx Cable connects to the serial port of both workstations and PCs.
• The Parallel Cable has better drive capability. The Parallel Cable can drive up to 10 XC9500/XL/XV devices in a boundary-scan chain, and the XChecker Cable can drive up to 4 XC9500/XL/XV devices.
• The Parallel Cable is at least 5 times faster.

If you have a Parallel Download Cable proceed to Parallel Cable. If you have a MultiLINX Cable proceed to MultiLINX Cable.

XChecker Hardware (Serial)

The XChecker hardware consists of a cable assembly with internal logic, a test fixture, and a set of headers to connect the cable to your
target system. Using the XChecker hardware requires either a standard DB-9 or DB- 25 RS-232 serial port. If you have a different serial port connection, you need to provide the appropriate adapter. “XChecker Hardware and Accessories” shows the XChecker cable hardware and accessories. The XChecker cable can be used with a single CPLD or several devices connected in a boundary-scan chain to download and readback configuration and boundary-scan data.

Connecting for System Operation
Connect the XChecker cable to the host system and your target system as shown in “XChecker Connections to JTAG Boundary-scan TAP”.

Cable Connections
Connections between the cable assembly and the target system use only 6 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. Once installed properly, the connectors provide power to the cable, allow download and readback of configuration data, and provide for logic probe of device pins.

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