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Minor clarifications
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azonenberg committed May 21, 2017
1 parent fa4658b commit 6b973f3
Showing 1 changed file with 2 additions and 2 deletions.
4 changes: 2 additions & 2 deletions doc/xbr/notes.txt
Original file line number Diff line number Diff line change
@@ -12,7 +12,7 @@ ZIA
40 rows, 8 bits per row
Each row is an 65:1 mux corresponding to one output from the global routing matrix.
The mux is a two level tree.
The first level consists of six 11:1 mask-programmed muxes (with a different coding for each row), reducing the 65
The first level consists of six 11:1 mask-programmed muxes (with a different setting for each row), reducing the 65
signals on the metal 4 bus down to six. The second level is an 8:1 one-hot bitstream-programmed mux, which selects the
final routing output as either a constant value or one of the six mask mux outputs.

@@ -162,7 +162,7 @@ Macrocells
10 = T flipflop
11 = D flipflop with clock enable
15:14 Input mux of some sort
00 = IBUF driving ZIA
00 = IBUF driving ZIA or flipflop direct path
11 = unused pin
Other values unknown
13:12 "FB val" - specifies output from macrocell to the ZIA

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