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ST78C36A 数据表(PDF) 3 Page - Exar Corporation

部件名 ST78C36A
功能描述  ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO
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制造商  EXAR [Exar Corporation]
网页  http://www.exar.com
标志 EXAR - Exar Corporation

ST78C36A 数据表(HTML) 3 Page - Exar Corporation

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ST78C36/36A
REV. 5.0.2
ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO
3
PIN DESCRIPTION
NAME
44-PLCC
PIN
#
64-LQFP
PIN
#
TYPE
DESCRIPTION
DATA BUS INTERFACE
A10
A2
A1
A0
29
39
41
40
36
46
53
52
I
Address Select Lines. A10 places the ECP control/status/data ports at
0x400 offset from the -CS decoded address.
D7
D6
D5
D4
D3
D2
D1
D0
9
10
11
12
13
14
15
16
5
6
7
8
9
10
11
12
I/O
Data bus. Bi-directional data port.
-IOR
43
55
I
Active low AT bus I/O Read strobe.
-IOW
42
54
I
-CS
22
24
I
Chip select (active LOW). A LOW at this pin enables the parallel port /
CPU data transfer operation.
IOCHRDY
18
19
O
I/O Channel ready (internal pull-up / three stated active HIGH). This pin
goes low when the device requires addition clock cycles for read and
write.
-IRQ9
-IRQ7
-IRQ5
-
19
-
14
20
18
O
Interrupt Request Lines (three stated active low).
AEN
17
13
I
DMA address enable (active HIGH). When this line is HIGH, the DMA
controller has control of the address bus.
DRQ3
DRQ2
DRQ1
7
-
-
3
63
51
O
Active high AT bus DMA ReQuest for channels 3, 2 and 1 (internal pull-
down three stated active HIGH). A request is generated by bringing a
DRQx line to a HIGH level. A DRQx line is held HIGH until the corre-
sponding DMA acknowledge “DACKx*” line goes LOW.
-DACK3
-DACK2
-DACK1
8
-
-
4
2
47
I
DMA Acknowledge signals for channels 3, 2 and 1 (internal pull-up /three
stated active low).
TC
6
62
I
Terminal Count (active HIGH). The ST78C36 terminates the DMA channel
when a HIGH pulse is detected.


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