Epson TM-U950 Technical Manual page 81

CONFIDENTIAL
Table 2-2. Gate Array Pin Assignments (continued)
Pin number
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Operation panel and cover open sensor circuits
There are five LEDs on the operation panel (POWER, ERROR, RECEIPT OUT, JOURNAL OUT,
and SLIP) and two buttons (RECEIPT FEED, and JOURNAL/SLIP FEED). The cover open
sensor uses a photosensor.
These parts are mounted directly on the switch PCB unit, which is linked to the main PCB
assembly via connectors (CN8).
2-36 Mechanism Configuration and Operating Principles
Gate array function Signal designation`
AB 2 A 2
AB 3 A 3
AB 4 A 4
(R/W) (R/W)
(CS) (CS)
(E) (E)
ASTB ASTB
ALB 0 A 16
ABL 1 A 17
ABL 2 A 18
ABL 3 A 19
ABL 4 N. C
ABL 5 N. C
ABL 6 N. C
ABL 7 N. C
GND —
GND —
(V ) —
ss
DB 0 D 0
DB 1 D 1
DB 2 D 2
DB 3 D 3
DB 4 D 4
DB 5 D 5
DB 6 D 6
DB 7 D 7
I/O Level Description
I TTL Address signal Bit 2
I TTL Address signal Bit 3
I TTL Address signal Bit 4
I TTL Read/write signal
I TTL Chip select signal L = select
I TTL Enable signal
I TTL Address latch enable signal
O TTL Address signal Bit 16
O TTL Address signal Bit 17
O TTL Address signal Bit 18
O TTL Address signal Bit 19
O TTL Unused (open)
O TTL Unused (open)
O TTL Unused (open)
O TTL Unused (open)
— GND Power supply
— GND Power supply
— +5V Power supply
I/O TTL Data signal Bit 0
I/O TTL Data signal Bit 1
I/O TTL Data signal Bit 2
I/O TTL Data signal Bit 3
I/O TTL Data signal Bit 4
I/O TTL Data signal Bit 5
I/O TTL Data signal Bit 6
I/O TTL Data signal Bit 7
Rev. A