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Lattice Semiconductor ispDOWNLOAD Cables

Features

Programming Software

ispVM System/Diamond Programmer is the preferred programming management software tool for all Lattice devices and download cables. The latest version of ispVM System software or the Lattice Diamond Program-mer is ailable for download from the Lattice web site at www.latticesemi.com/software.

Target Board Design Considerations

A 4.7K pull-down resistor is recommended on the TCK connection of the target board. This pull-down is recom-mended to oid inadvertent clocking of the TAP cooller induced by fast clock edges or as V_CC ramps up. This pull-down is recommended for all Lattice programmable families.

For Lattice device families that feature low power, it is recommended to add a 500 ohm resistor between V_CCJ and GND during the programming interval when a USB ispDOWNLOAD cable is connected to a very low power board design. A FAQ is ailable that discusses this in more depth at:  www.latticesemi.com/support/faqs/details.cfm?id=2205

The JTAG programming port speed may need to be governed when using the ispDOWNLOAD cables connected to customer . This is especially important when there is long PCB routing or with many daisy-chained devices. The Lattice programming software can adjust the timing of TCK applied to the JTAG programming port from the cable. This low-precision port setting of TCK depends on many factors, including the PC speed and the type of cable used (parallel port, USB or USB2). This software feature provides an option to slow the TCK for debug or noisy environments. A FAQ is ailable that discusses this in more depth at:  www.latticesemi.com/support/faqs/details.cfm?id=974

The USB Download Cable can be used to program Power Manager or ispClock products with Lattice programming software. When using the USB cable with the Power Manager I devices, (POWR604, POW08, POW08P1), you must slow do TCK by a factor of 2. A FAQ is ailable that discusses this in more depth at:  www.latticesemi.com/support/faqs/details.cfm?id=306

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Lattice Semiconductor ispDOWNLOAD Cables

Programming Flywire and Connection Reference

Refer to Table 2 when connecting a flywire download cable to systems that use the 1x8-ition or 2x5-ition connectors. For newer Lattice FPGA families, a 1x10 connector used in conjunction with the ispDOWNLOAD USB cable adds support for the DONE and INITN signals. Both of these signals are inputs to the cable, and can be used to help verify device configuration.

Table 2. Flywire Conversion Reference

1. For devices that have a V_CCJ pin, the V_CCJ must be connected to the cable’s V_CC, and a 0.1?F decoupling capacitor is required on V_CCJ close to the device. Please refer to the device data sheet to determine if the device has a V_CCJ pin.

2. For older Lattice ISP devices, a 0.01?F decoupling capacitor is required on ispEN/ENABLE of the target board.

3. The TRST and DONE pin is multiplexed on the ispDOWNLOAD USB cable. If the device TRST signal is ailable on the board, connect the USB flywire TRST/DONE wire to TRST. If the device DONE signal is ailable on the board (or if both TRST and DONE are ailable), con-nect the USB flywire TRST/DONE wire to DONE. Please make sure the correct setting is selected in ispVM/Diamond Programmer (Options, Cable and I/O Port Setup). This will tell ispVM/Diamond Programmer whether the TRST/DONE cable is used as a TRST or a DONE signal.

4. A 4.7K pull-down resister is recommended on TCK of the target board.

Table lists the recommend pin connections. Please contact Lattice technical support for information on unlisted device families. (e-mail: techsupport@latticesemi.com, phone: 1-800-LATTICE).

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