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| author | Tim Ansell <tansell@google.com> | 2021-05-11 07:30:43 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-05-11 07:30:43 -0700 |
| commit | d9c7a0b366f8ad73d867211bd841fc11efd3b124 (patch) | |
| tree | d832f2dfa7e93dd63eae77f2a6e882c3a9802a59 /docs/device_resources.md | |
| parent | d2d7ad1531a5330877aa752b743b3629345b7592 (diff) | |
| parent | 828ec3a6188c74bd43825c11b71cc3bbbd65b26e (diff) | |
| download | fpga-interchange-schema-d9c7a0b366f8ad73d867211bd841fc11efd3b124.tar.gz fpga-interchange-schema-d9c7a0b366f8ad73d867211bd841fc11efd3b124.tar.bz2 fpga-interchange-schema-d9c7a0b366f8ad73d867211bd841fc11efd3b124.zip | |
Merge pull request #52 from gatecat/site-pips-diagrams
docs: Add a diagram showing legal/illegal site pip usage
Diffstat (limited to 'docs/device_resources.md')
| -rw-r--r-- | docs/device_resources.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/device_resources.md b/docs/device_resources.md index 323e177..9793098 100644 --- a/docs/device_resources.md +++ b/docs/device_resources.md @@ -242,6 +242,10 @@ entered via the site port corresponding to the site pin. The first site wire in the site will be the site wire attached to the output BEL pin of the site port. From there site routing continues per above. + + +### Use of site PIPs + It is important to note that site PIPs can only be used to access placed cells inside that site. Site PIPs cannot be used as general route-thrus, to route from site input to output. General route-thrus across entire sites should use @@ -255,7 +259,9 @@ an associated flipflop input inside the site. The tile PIP would be used to route across the entire site as part of the general, inter-tile, routing problem. - +A diagram illustrating the legal and illegal uses is shown below. + + ### Tile Types and site types |