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gem5/src/systemc
Robert Hauser 77528d1928 systemc: Use headerDelay in timing annotation (#1328)
1. Responder (downstream components):

    When sending a BEGIN_REQ, the timing annotation marks the time when
    a transaction is visible to the target (see [1] on page 465).

    When writing the data, the downstream component calculates the
    transfer time and would send END_REQ after this time (see [1] on
    page 540). Therefore, not the payloadDelay, but the headerDelay
    should be used, as already written as a comment in the source files.
    When reading data, payloadDelay will be 0 anyway.

2. Requester (upstream component):

    For data read, the begin of the transfer is marked by BEGIN_RESP
    and the upstream component would delay END_RESP to model the
    data transfer (see [1] on page 540). Therefore, BEGIN_RESP should be
    delayed by the headerDelay, not the payloadDelay.

[1] "IEEE Standard for Standard SystemC® Language Reference Manual," in
IEEE Std 1666-2023 (Revision of IEEE Std 1666-2011), vol., no.,
pp.1-618, 8 Sept. 2023, doi: 10.1109/IEEESTD.2023.10246125.

Change-Id: I3b5e8ad6bc37cbb309b124efdc8764fca3728b7a

Signed-off-by: Robert Hauser <robert.hauser@uni-rostock.de>
2024-07-05 09:05:24 -07:00
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2023-11-29 22:06:41 -08:00
2023-11-23 08:26:11 +08:00
2023-11-29 22:06:41 -08:00