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Padfunctional module with PU/PD signal control #18

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Padfunctional module with PU/PD signal control #18

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c79a043
add padfunctional module with PU/PD signal control
Nov 5, 2021
d21dc2e
Map generic pad functional to IO buffer.
luca-valente Nov 9, 2021
0002c7c
Update src/deprecated/pad_functional.sv
mattsini1 Nov 24, 2021
411bd43
add truth table for pad_functional module with PUEN signal
Nov 24, 2021
5912352
minor fix on name for pad_functional module
Nov 24, 2021
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40 changes: 39 additions & 1 deletion src/deprecated/pad_functional.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -79,4 +79,42 @@ module pad_functional_pu (
bufif0 (PAD_wi, 1'b1, PEN);
rpmos (PAD, PAD_wi, 1'b0);

endmodule
endmodule

module pad_functional (
input logic OEN,
input logic I,
output logic O,
input logic PUEN,
input logic PEN,
inout wire PAD
);

/*
X Unknown
Z Hi-Z
H Pull High
L Pull Low
*/

/*
OEN I PAD PUEN PEN | PAD O
|
0 0 - 0/1 0/1 | 0 0
0 1 - 0/1 0/1 | 1 1
1 0/1 0 0/1 0/1 | - 0
1 0/1 1 0/1 0/1 | - 1
1 0/1 Z 0 0 | H H
1 0/1 Z 1 0 | L L
1 0/1 Z 0/1 1 | - X

*/

wire PAD_wi;

bufif0 (PAD, I, OEN);
buf (O, PAD);
bufif0 (PAD_wi, ~PUEN, PEN);
rpmos (PAD, PAD_wi, 1'b0);

endmodule
22 changes: 20 additions & 2 deletions src/fpga/pad_functional_xilinx.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ module pad_functional_pd

(* PULLDOWN = "YES" *)
IOBUF iobuf_i (
.T ( OEN ),
.T ( OEN ),
.I ( I ),
.O ( O ),
.IO( PAD )
Expand All @@ -39,7 +39,25 @@ module pad_functional_pu

(* PULLUP = "YES" *)
IOBUF iobuf_i (
.T ( OEN ),
.T ( OEN ),
.I ( I ),
.O ( O ),
.IO( PAD )
);

endmodule

module pad_functional
(
input logic OEN,
input logic I,
output logic O,
input logic PEN,
inout logic PAD
);

IOBUF iobuf_i (
.T ( OEN ),
.I ( I ),
.O ( O ),
.IO( PAD )
Expand Down