am79c961a Advanced Micro Devices, am79c961a Datasheet - Page 132

• Manufacturer Part Number: am79c961a
• Description: Pcnet?-isa Ii Jumperless, Full Duplex Single-chip Ethernet Controller For Isa
• Manufacturer: Advanced Micro Devices

Optional Address PROM Interface
The suggested address PROM is the Am27LS19, a
32x8 device. APCS should be connected directly to the
device’s G input.
132
Bus
ISA
Shared Memory Block Diagram Plug and Play Compatible with Flash Memory Support
24-Bit System
System Data
Address PROM Example
Address
16-Bit
A4–A0
G
32 x 8 PROM
Q7–Q0
27LS19
V
SHFBUSY
SD[0–15]
SA[0–19]
CC
PCnet-ISA II
Controller
SRAM
PRAB[0-15]
19364B-28
BPAM
PRDB[2]/EEDO
Am79C961A
PRDB[0]/EESK
PRDB[1]/EEDI
IRQ12/SRCS
PRDB[0–7]
SROE
BPCS
SRWE
EECS
Boot PROM Interface
The boot PROM is a 8K – 64K EPROM. Its OE pin
should be tied to ground, and chip enable CE to BPCS
to minimize power consumption at the expense of
speed. Shown below is a 27C128.
Higher density EPROMs place an address line on the
pin that is defined for lower density EPROMs as the
V
tion on an EPROM, the V
level, as long as the voltage on the V
exceed the programming voltage threshold (typically
7 V to 12 V). Therefore, a socket with a 27512 pinout
will also support 2764 and 27128 EPROM devices.
PP
(programming voltage) pin. For READ only opera-
WE
A[0-15]
CS
DO
DI
SK
CS
SIN
CLK
BPAM
SRAM
SHFBUSY
A[0-15]
WE
CS
PP
pin can assume any logic
SA[16] LA[17-23]
External
FLASH
EEPROM
SRAM
Logic
Glue
MEMCS16
PP
D[0-7]
D[0-7]
ORG
pin does not
OE
OE
19364B-27
V
CC