Lattice Semiconductor

ispDOWNLOAD Cables

4

Table 3. Recommend Cable Connections

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 to drive the TRST pin high as fol-

lows:

1.

Select the Options menu item

2.

Select Cable and I/O Port Setup

3.

Check the TRST/Reset Pin Connected check box

4.

Select the Set High radio button

If the proper option is not selected, the TRST pin will be driven low by ispVM. 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.

Device Family

TCK, TMS,

TDI and TDO

ispEN/

ENABLE

1

PROGRAMN

PRGM

TRST

2, 6

DONE

3, 6

INITN

3, 6

LatticeSC/M

Mandatory

N/A

Do Not Connect

N/A

Optional

Optional

LatticeECP2/M

Mandatory

N/A

Do Not Connect

N/A

Optional

Optional

LatticeXP™, LatticeXP2™

Mandatory

N/A

Do Not Connect

N/A

Optional

Optional

LatticeECP/EC

Mandatory

N/A

Do Not Connect

N/A

Optional

Optional

MachXO™

Mandatory

N/A

N/A

N/A

N/A

N/A

ORCA/FPSC

Mandatory

N/A

Mandatory

N/A

Optional

Optional

ispXPGA

®

Mandatory

N/A

Optional

N/A

Optional

Optional

ispXPLD™

Mandatory

N/A

Optional

N/A

Optional

Optional

ispMACH

Mandatory

N/A

N/A

N/A

N/A

N/A

ispMACH/ispLSI

Mandatory

N/A

N/A

N/A

N/A

N/A

MACH

Mandatory

Optional

N/A

Optional

N/A

N/A

ispGDX2™

Mandatory

N/A

N/A

N/A

N/A

N/A

ispClock™

Mandatory

N/A

N/A

N/A

5

N/A

N/A

ispPAC Power Manager/

Power Manager II

Mandatory

N/A

N/A

Optional

5

N/A

N/A

ispPAC

Mandatory

N/A

N/A

N/A

5

N/A

N/A

1. Please refer to the ispDOWNLOAD Cable ispEN Pin section below for detailed information on connecting the ispEN/ENABLE pin.

2. Please 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 software.