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From: cvs at opencores.org<cvs@o...>
Date: Sat Mar 22 13:40:37 CET 2008
Subject: [cvs-checkins] MODIFIED: usbhostslave ...
Date: 00/08/03 22:13:40

Modified: usbhostslave/RTL/include usbHostSlave_h.v
Log:
Revision 1.3 - Fixed input metastability and delay hazard issue


Revision Changes Path
1.8 usbhostslave/RTL/include/usbHostSlave_h.v

http://www.opencores.org/cvsweb.shtml/usbhostslave/RTL/include/usbHostSlave_h.v.diff?r1=1.7&r2=1.8

(In the diff below, changes in quantity of whitespace are not shown.)

Index: usbHostSlave_h.v
===================================================================
RCS file: /cvsroot/sfielding/usbhostslave/RTL/include/usbHostSlave_h.v,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -b -r1.7 -r1.8
--- usbHostSlave_h.v 14 Oct 2006 04:04:09 -0000 1.7
+++ usbHostSlave_h.v 22 Mar 2008 12:40:37 -0000 1.8
@@ -48,10 +48,18 @@
// Replaced individual timescale directives with `include "timescale.v
// Renamed top level Altera wrapper from 'usbHostSlaveWrap' to
// 'usbHostSlaveAvalonWrap'
+// Version 1.3 - March 22nd 2008. Fixed bug in 'readUSBWireData'. Added
+// synchronizer to incoming USB wire data to avoid
+// metastability, and delay hazards. Not entirely sure, but it appears that
+// this bug caused more problems with some of the newer low power FPGAs
+// Maybe because they are more prone to problems with metastable
+// inputs that feed logic functions causing excessive high speed
+// toggle activity, and disrupting nearby cicuits.
+

// Most significant nibble corresponds to major revision.
// Least significant nibble corresponds to minor revision.
-`define USBHOSTSLAVE_VERSION_NUM 8'h12
+`define USBHOSTSLAVE_VERSION_NUM 8'h13

//Host slave common registers
`define HOST_SLAVE_CONTROL_REG 1'b0