Path: utzoo!utgpu!water!watmath!clyde!att!mtunx!pacbell!ames!ncar!noao!nud!tom From: tom@nud.UUCP (Tom Armistead) Newsgroups: comp.arch Subject: Re: RISC machines and scoreboarding Message-ID: <1095@nud.UUCP> Date: 22 Jun 88 15:56:08 GMT References: <1082@nud.UUCP> <22147@amdcad.AMD.COM> Reply-To: tom@nud.UUCP (Tom Armistead) Organization: Motorola Microcomputer Division, Tempe, Az. Lines: 18 In article <22147@amdcad.AMD.COM> tim@delirun.UUCP (Tim Olson) writes: >The scoreboarding on the 88k (correct me if I'm wrong) associates a bit >for each register in the register file to tell whether the value is >stale or not. During the issuing of an instruction, the operand >registers are checked for staleness, and the pipe is stalled if >required. This sums it up very well. [ Concerning different method of handling stale registers ] >value to be written into the register file. This method has the benefit >of integrating closely with the forwarding logic. The scoreboard method can allow register forwarding also. -- Just a few more bits in the stream. The Sneek