COM90C66 Datasheet, PDF (14/76 Pages) SMSC Corporation – ARCNET Controller/Transceiver with AT Interface and On-Chip RAM

IRQ2-IRQ5,
IRQ7
IBM PC
AT BUS ^AEN
BALE
nIOR
nIOW
nMEMR
nMEMW
RSTDRV
IOCHRDY
nOWS
nIOCS16
nMEMCS16
nSBHE
D8-D15
D0-D7
21
43
65
87
10 9
12
12
nG DIR
B1-B8
A1-A8
ALS245
nG DIR
B1-B8
A1-A8
ALS245
Memory I/O
Base Address
Select Switch
35
Node ID
Select Switch
8
16-Bit interface signals;
not necessary in
8-bit interface
Twisted Pair circuitry shown.
For COAX circuitry, see
HYC9058/68 data sheets.
AEN
BALE
INTR IOS0-2 MS0-4
NID0-7
C7
XTAL1
+5V
C1 C2
+
nIOR
nIOW
nMEMR
nMEMW
RESET IN
IOCHRDY
XTAL2
nPULSE2
nPULSE1
C8
6
HYC9088
18
20
R1 C3
R2
nOWS
RXIN
7
12
nIOCS16
nMEMCS16
nSBHE
nTOPH
D8-D15
SMSC
COM90C66
CLK N/C
CACLK N/C
NC N/C
NC N/C
17
19
4
13
14
3
11
R3
R4 _C4
J1
11223344
1234
J2
nTOPL
D0-D7
C5
+
nTXLED
C6
-5V
+5V
+5V
R5
nPROM A0-A19 nENROMGND ^VCC nBSLED
R6
A0-A19
nMEMR
nOE nCS
D0-D7
A0-A12
8K x
8PROM
SOCKET
1 ROM
2ENABLE
+5V
C9
R1-R4 = 5.6K, 1/2 W
R5,R6 = 500
C1,C5 = 10 uF
C2,C6 = 0.47 uF
C3,C4 = 27 pF
C7,C8 = 47 pF
C9 = 0.1 uF
FIGURE 2 - SYSTEM BLOCK DIAGRAM
14