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AR# 7573

XPLA Programmer - CoolRunner does not program when parts are detected in the chain.


Keywords: XPLA, PC-ISP, programmer, ISP, ISC, JTAG, CoolRunner,
program, chain, daisy

Urgency: Hot

General Description:
Why are the parts not programming when the software detects them in the chain?


ISP operations can require a substantial amount of current for extended
periods during "verify" (100mA for 5 seconds). If the power supply of the
system cannot support this, the "verify" will fail.

Programming also requires a larger amount of current, although the program
pulse current requirement typically lasts only 10ms to 100ms. ISP operations
such as program and verify will not correctly operate with high impedance
voltage sources, or micro power supplies.
AR# 7573
Date Created 09/15/1999
Last Updated 02/12/2002
Status Archive
Type General Article