Answers Database

PCI User's Guide: BHx_DEC, BHx_OE equations have incorrect terms


Record #1901

Product Family:  Software

Product Line:  Logicore

Problem Title:
PCI User's Guide: BHx_DEC, BHx_OE equations have incorrect terms


Problem Description:
On page 28 and 29 of the PCI User's Guide, v1.1 are these two equations:

BHx_DEC  := BASE_HITx * S_WRDN
	 *  [PCI_CMDx] (optional)
	 *  [ADDR_CNTx] (optional)
	 *  (!S_DATA * BHx_DEC)

BHx_OE	 := !(BASE_HITx * S_WRDN
	 *  [PCI_CMDx] (optional)
	 *  [ADDR_CNTx] (optional)
	 *  (!S_DATA * !BHx_OE))

The latch terms are incorrect.


Solution 1:

S_DATA and BHx_DEC are active high signals.
BHx_OE is an active low signal.

In the first equation, the latch term (!S_DATA * BHx_DEC)
should be (S_DATA * BHx_DEC).

In the second equation, the latch term (!S_DATA * !BHx_OE)
should be (S_DATA * !BHx_OE).



End of Record #1901