Answers Database

M1.4: Prom File Formatter uses different format for byte-wide prom sizes


Record #3704

Product Family:  Software

Product Line:  FPGA Core

Problem Title:
M1.4: Prom File Formatter uses different format for byte-wide prom sizes


Problem Description:
Keywords: prom file formatter, byte wide, proms

Urgency: Standard

General Description:  The prom file formatter appears to select the wrong size
byte wide prom when 'Automatic Selection' is checked.


Solution 1:

When selecting a byte wide prom, the prom file formatter appears to select the
wrong size prom.  The reason it appears incorrect is because the prom file
formatter measures byte size proms in bytes instead of bits.

For example:

Prom size	   Prom File Formatter	       Prom marking
---------	  --------------------	       -------------
64 kbytes	    8k*8[64k]			64k*8[512k]
		    this is 64kbytes		 this is 512k bits = 64kbytes

The prom file that is produced will program a byte wide prom labeled 64k*8.
However, DO NOT buy a prom labeled 8k*8[64k] because the prom will be too small.



End of Record #3704