Re: control co-processor

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Sujet : Re: control co-processor
De : monnier (at) *nospam* iro.umontreal.ca (Stefan Monnier)
Groupes : comp.arch
Date : 05. May 2025, 15:02:58
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <jwvikmfupga.fsf-monnier+comp.arch@gnu.org>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13
User-Agent : Gnus/5.13 (Gnus v5.13)
Even state-of-the-art CPUs today commonly use scan-chains (via JTAG)
for debuggin.

Is there some blog somewhere that explains how scan-chains work (not
how they're used, but how they're implemented inside the CPU)?
Intuitively they sound very costly to me, because of things like the
need to run extra wires all over the place.  I'm obviously
missing something.


        Stefan

Date Sujet#  Auteur
7 Sep 24 * Tonights Tradeoff99Robert Finch
7 Sep 24 `* Re: Tonights Tradeoff98MitchAlsup1
8 Sep 24  `* Re: Tonights Tradeoff97Robert Finch
8 Sep 24   `* Re: Tonights Tradeoff96MitchAlsup1
10 Sep 24    `* Re: Tonights Tradeoff95Robert Finch
10 Sep 24     +* Re: Tonights Tradeoff17BGB
10 Sep 24     i+* Re: Tonights Tradeoff12Robert Finch
10 Sep 24     ii+* Re: Tonights Tradeoff10BGB
11 Sep 24     iii`* Re: Tonights Tradeoff9Robert Finch
11 Sep 24     iii +* Re: Tonights Tradeoff7Stephen Fuld
11 Sep 24     iii i+- Re: Tonights Tradeoff1MitchAlsup1
12 Sep 24     iii i`* Re: Tonights Tradeoff5Robert Finch
12 Sep 24     iii i `* Re: Tonights Tradeoff4MitchAlsup1
12 Sep 24     iii i  `* Re: Tonights Tradeoff3Robert Finch
12 Sep 24     iii i   `* Re: Tonights Tradeoff2MitchAlsup1
13 Sep 24     iii i    `- Re: Tonights Tradeoff1MitchAlsup1
12 Sep 24     iii `- Re: Tonights Tradeoff1BGB
11 Sep 24     ii`- Re: Tonights Tradeoff1MitchAlsup1
11 Sep 24     i`* Re: Tonights Tradeoff4MitchAlsup1
12 Sep 24     i `* Re: Tonights Tradeoff3Thomas Koenig
12 Sep 24     i  `* Re: Tonights Tradeoff2BGB
12 Sep 24     i   `- Re: Tonights Tradeoff1Robert Finch
11 Sep 24     `* Re: Tonights Tradeoff77MitchAlsup1
15 Sep 24      `* Re: Tonights Tradeoff76Robert Finch
16 Sep 24       `* Re: Tonights Tradeoff75Robert Finch
24 Sep 24        `* Re: Tonights Tradeoff - Background Execution Buffers74Robert Finch
24 Sep 24         `* Re: Tonights Tradeoff - Background Execution Buffers73MitchAlsup1
26 Sep 24          `* Re: Tonights Tradeoff - Background Execution Buffers72Robert Finch
26 Sep 24           `* Re: Tonights Tradeoff - Background Execution Buffers71MitchAlsup1
27 Sep 24            `* Re: Tonights Tradeoff - Background Execution Buffers70Robert Finch
4 Oct 24             `* Re: Tonights Tradeoff - Background Execution Buffers69Robert Finch
4 Oct 24              +* Re: Tonights Tradeoff - Background Execution Buffers66Anton Ertl
4 Oct 24              i`* Re: Tonights Tradeoff - Background Execution Buffers65Robert Finch
5 Oct 24              i `* Re: Tonights Tradeoff - Background Execution Buffers64Anton Ertl
9 Oct 24              i  `* Re: Tonights Tradeoff - Background Execution Buffers63Robert Finch
9 Oct 24              i   +* Re: Tonights Tradeoff - Background Execution Buffers3MitchAlsup1
9 Oct 24              i   i+- Re: Tonights Tradeoff - Background Execution Buffers1Robert Finch
12 Oct 24              i   i`- Re: Tonights Tradeoff - Background Execution Buffers1BGB
12 Oct 24              i   +* Re: Tonights Tradeoff - Carry and Overflow58Robert Finch
12 Oct 24              i   i`* Re: Tonights Tradeoff - Carry and Overflow57MitchAlsup1
12 Oct 24              i   i `* Re: Tonights Tradeoff - Carry and Overflow56BGB
12 Oct 24              i   i  `* Re: Tonights Tradeoff - Carry and Overflow55Robert Finch
13 Oct 24              i   i   +* Re: Tonights Tradeoff - Carry and Overflow3MitchAlsup1
13 Oct 24              i   i   i`* Re: Tonights Tradeoff - ATOM2Robert Finch
13 Oct 24              i   i   i `- Re: Tonights Tradeoff - ATOM1MitchAlsup1
13 Oct 24              i   i   +- Re: Tonights Tradeoff - Carry and Overflow1BGB
31 Oct 24              i   i   `* Page fetching cache controller50Robert Finch
31 Oct 24              i   i    +- Re: Page fetching cache controller1MitchAlsup1
6 Nov 24              i   i    `* Re: Q+ Fibonacci48Robert Finch
17 Apr 25              i   i     `* Re: register sets47Robert Finch
17 Apr 25              i   i      `* Re: register sets46Stephen Fuld
17 Apr 25              i   i       +- Re: register sets1Robert Finch
17 Apr 25              i   i       `* Re: register sets44MitchAlsup1
18 Apr 25              i   i        `* Re: register sets43Robert Finch
18 Apr 25              i   i         `* Re: register sets42MitchAlsup1
20 Apr 25              i   i          `* Re: register sets41Robert Finch
21 Apr 25              i   i           `* Re: auto predicating branches40Robert Finch
21 Apr 25              i   i            `* Re: auto predicating branches39Anton Ertl
21 Apr 25              i   i             +- Is an instruction on the critical path? (was: auto predicating branches)1Anton Ertl
21 Apr 25              i   i             `* Re: auto predicating branches37MitchAlsup1
22 Apr 25              i   i              `* Re: auto predicating branches36Anton Ertl
22 Apr 25              i   i               +- Re: auto predicating branches1MitchAlsup1
22 Apr 25              i   i               `* Re: auto predicating branches34Anton Ertl
22 Apr 25              i   i                `* Re: auto predicating branches33MitchAlsup1
23 Apr 25              i   i                 +* Re: auto predicating branches3Stefan Monnier
23 Apr 25              i   i                 i`* Re: auto predicating branches2Anton Ertl
25 Apr 25              i   i                 i `- Re: auto predicating branches1MitchAlsup1
23 Apr 25              i   i                 `* Re: auto predicating branches29Anton Ertl
23 Apr 25              i   i                  `* Re: auto predicating branches28MitchAlsup1
24 Apr 25              i   i                   `* Re: asynch register rename27Robert Finch
27 Apr 25              i   i                    `* Re: fractional PCs26Robert Finch
27 Apr 25              i   i                     `* Re: fractional PCs25MitchAlsup1
28 Apr 25              i   i                      `* Re: fractional PCs24Robert Finch
28 Apr 25              i   i                       +* Re: fractional PCs13MitchAlsup1
29 Apr 25              i   i                       i`* Re: fractional PCs12Robert Finch
5 May 25              i   i                       i `* Re: control co-processor11Robert Finch
5 May 25              i   i                       i  `* Re: control co-processor10Al Kossow
5 May 25              i   i                       i   `* Re: control co-processor9Stefan Monnier
6 May 25              i   i                       i    +* Re: control co-processor2MitchAlsup1
7 May 25              i   i                       i    i`- Re: control co-processor1MitchAlsup1
7 May 25              i   i                       i    `* Scan chains (was: control co-processor)6Stefan Monnier
7 May 25              i   i                       i     +* Re: Scan chains (was: control co-processor)2Al Kossow
7 May 25              i   i                       i     i`- Re: Scan chains1Stefan Monnier
7 May 25              i   i                       i     `* Re: Scan chains3MitchAlsup1
7 May 25              i   i                       i      `* Re: Scan chains2Stefan Monnier
8 May 25              i   i                       i       `- Re: Scan chains1MitchAlsup1
29 Apr 25              i   i                       `* Re: fractional PCs10Robert Finch
29 Apr 25              i   i                        `* Re: fractional PCs9MitchAlsup1
30 Apr 25              i   i                         `* Re: fractional PCs8Robert Finch
30 Apr 25              i   i                          +* Re: fractional PCs6Thomas Koenig
1 May 25              i   i                          i+- Re: fractional PCs1Robert Finch
2 May 25              i   i                          i`* Re: fractional PCs4moi
2 May 25              i   i                          i +* Re: millicode, extracode, fractional PCs2John Levine
2 May 25              i   i                          i i`- Re: millicode, extracode, fractional PCs1moi
2 May 25              i   i                          i `- Re: fractional PCs1moi
30 Apr 25              i   i                          `- Re: fractional PCs1MitchAlsup1
13 Oct 24              i   `- Re: Tonights Tradeoff - Background Execution Buffers1Anton Ertl
4 Oct 24              +- Re: Tonights Tradeoff - Background Execution Buffers1BGB
6 Oct 24              `- Re: Tonights Tradeoff - Background Execution Buffers1MitchAlsup1

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