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ispDOWNLOAD Cables
Table 3. Recommended Pin Connections (Continued)
Device Family
TDI
TDO
TMS
TCK
ispEN/PROG 1,6 TRST 2 /DONE 3,6
INITN 3,6
VCC
GND
ispPAC
?
Mandatory Mandatory Mandatory Mandatory
N/A
N/A
N/A
Mandatory Mandatory
1. Refer to the ispDOWNLOAD Cable ispEN Pin section below for detailed information on connecting the ispEN/ENABLE pin.
2. Refer to the ispDOWNLOAD Cable TRST Pin section below for detailed information on connecting the TRST pin.
3. The DONE and INITN signals are only available on the ispDOWNLOAD USB cable. These signals are inputs to the cable and can be used to help verify device
configuration.
4. Please refer to the device data sheet. Not all packages have the ENABLE or TRST pin.
5. When using PAC-Designer ? software to program ispPAC devices, do not connect this pin.
6. When using these connections, be sure to select the correct settings in the Cable and I/O Port Setup dialog in the ispVM System/Diamond Programmer soft-
ware.
Connecting the ispDOWNLOAD Cable
The target board must be un-powered when connecting, disconnecting, or reconnecting the ispDOWNLOAD
Cable. Always connect the ispDOWNLOAD Cable’s GND pin (black wire), before connecting any other JTAG pins.
Failure to follow these procedures can result in damage to the target programmable device.
ispDOWNLOAD Cable TRST Pin
Connecting the board TRST pin to the cable TRST pin is not recommended. Instead, connect the board TRST pin
to Vcc. If the board TRST pin is connected to the cable TRST pin, instruct ispVM/Diamond Programmer to drive the
TRST pin high as follows:
1. Select the Options menu item.
2. Select Cable and I/O Port Setup .
3. Check the TRST/Reset Pin Connected checkbox.
4. Select the Set High radio button.
If the proper option is not selected, the TRST pin will be driven low by ispVM/Diamond Programmer. Consequently,
the BSCAN chain will not work because the chain will be locked into RESET state.
ispDOWNLOAD Cable ispEN Pin
The following pins should be grounded:
? BSCAN pin of the 2000VE devices
? ENABLE pin of MACH4A3/5-128/64, MACH4A3/5-64/64 and MACH4A3/5-256/128 devices.
However, the user has the option of having the BSCAN and ENABLE pins driven by the ispEN pin from the cable.
In this case, ispVM/Diamond Programmer must be configured to drive the ispEN pin low as follows:
1. Select the Options menu item.
2. Select Cable and I/O Port Setup .
3. Check the ispEN/BSCAN Pin Connected checkbox.
4. Select the Set Low radio button.
6
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