From: Luke Kenneth Casson Leighton Date: Fri, 24 May 2019 17:17:43 +0000 (+0100) Subject: add shadowing description X-Git-Tag: convert-csv-opcode-to-binary~4672 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=690922dd2f5025c51716e9e4145434662f08fc14;p=libreriscv.git add shadowing description --- diff --git a/3d_gpu/6600scoreboard.mdwn b/3d_gpu/6600scoreboard.mdwn index a65c8198b..f223cdf49 100644 --- a/3d_gpu/6600scoreboard.mdwn +++ b/3d_gpu/6600scoreboard.mdwn @@ -95,6 +95,10 @@ Shadowing is important as it is the fundamental basis of: Modifications to the shadow circuit below allow the shadow flip-flops to be automatically reset after a Function Unit "dies". Without these modifications, the shadow unit may spuriously fire on subsequent re-use -due to some of the latches being left in the previous state. +due to some of the latches being left in a previous state. + +Note that only "success" will cause the latch to reset. Note also +that the introduction of the NOT gate causes the latch to be more like +a DFF (register). [[!img shadow.jpg]]