General Description:
How long after the Program pin is released is the JTAG TAP available when I configure a Virtex, Virtex-E, or Spartan-II device?
If you hold the Virtex PROG pin low, this will force the TAP into the Test-Logic-Reset (TLR) state.
The JTAG TAP is available immediately after the Program pin is released. At this time, the IDCODE instruction is loaded according to the JTAG standard. If a configuration instruction is to be loaded, wait 100 us to allow the device to finish clearing the configuration memory.
For more information, please refer to the Power-up Timing Characteristics in the data book for the appropriate device.
AR# 8641 | |
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日期 | 12/15/2012 |
状态 | Active |
Type | 综合文章 |