From: lkcl <lkcl@web>
Date: Tue, 10 May 2022 16:20:14 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~2272
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2b7d07e2e072578ce6d970c81dc91889cf18d5b9;p=libreriscv.git

---

diff --git a/docs/pinmux.mdwn b/docs/pinmux.mdwn
index eabac69f4..4e33ec0f2 100644
--- a/docs/pinmux.mdwn
+++ b/docs/pinmux.mdwn
@@ -524,7 +524,12 @@ and for writing, slightly different style:
             if sel[i]:
                 GPIO[GPIO_num].eq(write_byte)
 
-As explained in this video
+As explained in this video <https://m.youtube.com/watch?v=Pf6gmDQnw_4>
+if each GPIO is mapped to one single byte, and it is assumed that
+the `sel` lines are enough to **always** give byte-level read/write
+then the GPIO number *becomes* the Memory-mapped byte number, hence
+the use of `len(sel)` above.  `len(dat_r)//8` would do as well
+because these should be equal.
 
 ## Combining JTAG BS Chain and Pinmux (In Progress)
 [[!img io_mux_bank_planning.JPG size="600x"]]