com90c66 Standard Microsystems Corp., com90c66 Datasheet - Page 14

• Manufacturer Part Number: com90c66
• Description: Arcnet Controller/transceiver With At Interface And On-chip Ram Corporation
• Manufacturer: Standard Microsystems Corp.

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