Since his question may have been an ixp1200 (and not ixp2xxx) he really just wants to remove the defer[1]. jim -----Original Message----- From: David Mentre [mailto:Mentre@tcl.ite.mee.com] Sent: Tuesday, February 17, 2004 11:27 AM To: 'IXP1200 Developer's List' Subject: RE: [ixp1200] How to Ensure Microcode Executes in the Correct Ord er? Hello Jo,

From: Jo Ueyama [mailto:ueyama@comp.lancs.ac.uk] Sent: Tuesday, February 17, 2004 5:06 PM

What instruction/switch do I need to add in order to ensure that instructions in microcode are carried in the correct order? In the code below the alu instruction MUST be performed *after* scratch read finishes AND *before* write scratch is carried out. Any ideas?

You must use a signal to wait for the read to be done. More specifically:

#include "stdmac.uc"

.local zero gpr1 $xfer

.sig sig_scratch

immed32[gpr1, 0x1100AB88] immed32[zero, 0x0]

scratch[read, $xfer, zero, 0, 1], ctx_swap, defer[1]

;; replace above line with: scratch[read, $xfer, zero, 0, 1], sig_done[sig_scratch] ctx_arb[sig_scratch] ;; after that point, you'll be sure that read is done

alu[$xfer, $xfer, +, gpr1] scratch[write, $xfer, zero, 0, 1], ctx_swap .endlocal

I've not compiled that code, so I may I made a typo or forgotten something. Signals are used at length in Intel microcode. You should absolutely read Intel manuals if you want to do serious IXP programming. Look at Intel Programmers Reference, sect. 2.8, registers & signals. Yours, david -- David Mentré - Research engineer (Ph.D.) Mitsubishi Electric ITE-TCL / European Telecommunication Research Lab Phone: +33 2 23 45 58 29 / Fax: +33 2 23 45 58 59 http://www.mitsubishi-electric-itce.fr _______________________________________________ ixp1200 mailing list ixp1200@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/ixp1200 - - - - - - - Appended by Scientific-Atlanta, Inc. - - - - - - - This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer.