NexGen: Hacking the Fuel Load Indicator v - Display Board Pinouts

6 Sep 2019

This page has been redacted see NexGen: Fuel Load Indicator: Pinouts Redux

Well, I just found out some errors in my part ii Fuel Load Indicator addendum interface table. Apparently, I was using the wrong part's pinout, "So without further eloquence"₁, here are the new tables.

Signal Type	Signal Color
Data Lines
Address Lines
Control Lines U1
Control Lines U2

Notes:

U2 is closest to the off-board connector.
Both Logic Ground and Supply Ground are tied together.
In the connector table, a 0 at the end means it is LOW ACTIVE

Comments:

For some unknown reason, the designer chose to separate all for control signals for U1 and U2 (He should find his way to engineer hell)
CLS₁ and CLS₂, Clock Select, are tied together and pulled HIGH for internal Clock
CLK₁ and CLK₂, Clock, are tied together and pulled high
RST₁0 and RST₂0, Reset, are tied together and pulled high
WR₁0 and WR₂0, Write, are tied together and pulled high ( I am still looking for WR₂0)
RD₁0 and RD₂0, Read, are tied together and pulled high.
FL₁0 and FL₂0, Flash, are tied together and pulled high.
CE₁0 and CE₂0, Chip Enable, are not tied together and pulled up high.

HDSP 2131 Pinout
Pin	Signal Name	Pin	Signal Name
1	CLS	32	A4
2	CLK	31	A3
3	WR	30	A2
4	CE	29	A1
5	RST	28	A0
6	RD	27	FL
7	NO PIN	26	NO PIN
8	NO PIN	25	NO PIN
9	NO PIN	24	NO PIN
10	NO PIN	23	NO PIN
11	D0	22	D7
12	D1	21	D6
13	D2	20	D5
14	D3	19	D4
15	NC	18	GRD (LOGIC)
16	V_DD	17	GND (SUPPLY)

Connector
TOP	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30
BOTTOM	1	3	5	7	9	11	13	15	17	19	21	23	25	27	29
							KEYWAY

PIN	Signal Name	U1	U2
TOP ROW
2	V_DD	16	16
4	V_DD	16	16
6	RST₂0	-	5
8	FL₁	27	-
10	FL_₂	-	27
12	CE₁0	4	-
14	RD₂0	-	6
16	WR₁0	3	-
18	CLS₁	1	-
20	D4	19	19
22	D2	13	13
24	D1	12	12
26	A1	29	29
28	A3	31	31
30	A2	30	30

PIN	Signal Name	U1	U2
BOTTOM ROW
1	GND	17	17
3	GND	18	18
5	RST₁0	5	-
7	CLK₁	1	-
9	CLK₂	-	2
11	RD₁0	6	-
13	CE₂0	-	4
15	CLS₂	-	1
17	D7	22	22
19	D6	21	21
21	D5	20	20
23	D3	14	14
25	D0	11	11
27	A4	32	32
29	A0	28	28

For testing, I plan I just hooking one a display and run it. After if there are no more errors, I then can interface it via I²C.

Refs

1. The Quiet Man, 1952, IMDb as spoken by Barry Fitzgerald