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AR# 34599 iMPACT - Status Register read shows all '0'

The Status Register read backby iMPACTis all '0'. Why wouldI get a value like this?

The followingare possible scenarios where this can occur:

(1) Usually this indicates that the PROG_Bor INIT_B pinsare pulled down to GND.

(2) Check your power rails. Vccint or Vccaux may not be at the correct level. Verify this against the data sheet for the specific device.

(3) Check the Security Option set in Bitgen. Some security options prohibit readback. For more information about this, please refer to (Xilinx Answer 30883)

(4) If you see this on Virtex-6 FPGA in ISE 12.1, 12.2 or 12.3 software, refer to (Xilinx Answer 39566)

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AR# 34599
Date Created	03/05/2010
Last Updated	12/15/2012
Status	Active
Type	General Article
Devices	Spartan-3 Spartan-3 XA Spartan-3A More Spartan-3A DSP Spartan-3AN Spartan-3E Spartan-6 LX Spartan-6 LXT Spartan-II Spartan-IIE Spartan-IIE XA Spartan-XL IQ System ACE Virtex Virtex QPro/R Virtex-4 FX Virtex-4 LX Virtex-4 QPro/R Virtex-4 SX Virtex-5 FXT Virtex-5 LX Virtex-5 LXT Virtex-5 SXT Virtex-5 TXT Virtex-5Q Virtex-6 CXT Virtex-6 HXT Virtex-6 LX Virtex-6 LXT Virtex-6 SXT Virtex-E Virtex-E QPro Virtex-EM Virtex-II Virtex-II Pro Virtex-II Pro X Virtex-II QPro/R Less
Tools	ISE Design Suite - 11.4 ISE - 10.1 ISE Design Suite - 11.1 More ISE Design Suite - 11.2 ISE Design Suite - 11.3 ISE - 8.1i ISE - 8.1i sp1 ISE - 8.1i sp2 ISE - 8.1i sp3 ISE - 8.2i ISE - 8.2i sp1 ISE - 8.2i sp2 ISE - 8.2i sp3 ISE - 9.1i ISE - 9.1i sp1 ISE - 9.1i sp2 ISE - 9.1i sp3 ISE - 9.2i ISE - 9.2i sp1 ISE - 9.2i sp2 ISE - 9.2i sp3 ISE - 9.2i sp4 ISE - Legacy Less
Boards & Kits	Platform Cable USB Platform Cable USB-II

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