HW-USBN-2A Datasheet, PDF (4/7 Pages) Lattice Semiconductor – ispDOWNLOAD Cables For Programming Lattice ISP Devices

Lattice Semiconductor
ispDOWNLOAD Cables
Table 3. Recommend Cable Connections
Device Family
TCK, TMS,
TDI and TDO
ispEN/
ENABLE¹
PROGRAMN⁶/
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^® 4000
Mandatory
N/A
N/A
N/A
N/A
N/A
ispMACH/ispLSI^® 5000
Mandatory
N/A
N/A
N/A
N/A
N/A
MACH^®4A⁴
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/A⁵
N/A
N/A
ispPAC Power Manager/
Power Manager II
Mandatory
N/A
N/A
Optional⁵
N/A
N/A
ispPAC
Mandatory
N/A
N/A
N/A⁵
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.
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.
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