82C237
Pinouts
82C237 (DIP)
82C237 (CLCC/PLCC)
TOP VIEW
TOP VIEW
IOR
IOW
1
2
3
4
5
6
7
8
9
40 A7
39 A6
38 A5
37 A4
36 EOP
35 A3
34 A2
33 A1
32 A0
44
43 42 41 40
6
5
4
3
2
1
MEMR
MEMW
7
39
38
NC
NC
A3
A2
8
DWLE
(NOTE)
HLDA
9
37 A1
READY
HLDA
10
11
12
A0
V
ADSTB
AEN
36
35
34
33
32
31
30
29
CC
ADSTB
AEN
HRQ
DB0
DB1
DB2
DB3
DB4
NC
CS 13
CLK
14
15
HRQ 10
CS 11
31 V
CC
RESET
30 DB0
29 DB1
28 DB2
27 DB3
26 DB4
25 DACK0
24 DACK1
23 DB5
22 DB6
21 DB7
DACK2 16
NC
CLK 12
17
RESET 13
DACK2 14
DACK3 15
DREQ3 16
DREQ2 17
DREQ1 18
DREQ0 19
(GND) VSS 20
18 19 20 21 22 23 24 25 26 27 28
NOTE: See Pin Description.
Block Diagram
DWLE
EOP
IO
BUFFER
DECREMENTOR
INC DECREMENTOR
A0 - A3
RESET
CS
TEMP WORD
COUNT REG (16)
TEMP ADDRESS
REG (16)
TIMING
AND
CONTROL
READY
CLK
16-BIT BUS
16-BIT BUS
AEN
OUTPUT
BUFFER
A4 - A7
READ BUFFER
READ WRITE BUFFER
ADSTB
MEMR
MEMW
IOR
BASE
CURRENT
CURRENT
ADDRESS
BASE
ADDRESS
(16)
WORD
COUNT
(16)
WORD
COUNT
(16)
(16)
IOW
COMMAND
CONTROL
WRITE
BUFFER
READ
BUFFER
D0 - D1
DATA-WIDTH
(4)
4
4
DREQ0 -
DREQ3
PRIORITY
ENCODER
AND
ROTATING
PRIORITY
LOGIC
COMMAND
(8)
IO
BUFFER
INTERNAL DATA BUS
HLDA
HRQ
MASK
(4)
DACK0 -
DACK3
REQUEST
(4)
STATUS
(8)
TEMPORARY
(8)
MODE
(4 x 6)
4-149
INTERSIL [ Intersil ]
