am79c960 Advanced Micro Devices, am79c960 Datasheet - Page 86

• Manufacturer Part Number: am79c960
• Description: Pcnettm-isa Single-chip Ethernet Controller
• Manufacturer: Advanced Micro Devices

Address PROM Interface
The suggested address PROM is the Am27LS19, a
32x8 device. APCS should be connected directly to the
device’s G input.
Boot PROM Interface
The boot PROM is a 16Kx8 EPROM. Its program pin P
should be tied to V
and chip enable CE to BPCS to minimize power con-
sumption at the expense of speed. If speed is more
important, then ground CE and connect OE to BPCS.
1-428
AMD
Bus
ISA
16-Bit System Data
Address PROM Example
Boot PROM Example
A4–A0
G
Address
P
System
CE
A13–A0
OE
CC
16K x 8 EPROM
32 x 8 PROM
, output enable OE tied to ground,
27LS19
27C128
Q7–Q0
DQ7–DQ0
ABOE BPAM SMAM
16907B-16
Compare
E
Address
Address
Buffer
16907B-17
PCnet-ISA
Controller
Shared Memory Block Diagram
P R E L I M I N A R Y
PRAB0–15
PRDB0–7
SRWE
APCS
SROE
BPCS
Am79C960
8-Bit Private Data
16-Bit Private Address Bus
Static RAM Interface (for Shared Memory
only)
The SRAM is an 8Kx8 or 32Kx8 device. The PCnet-ISA
controller can support 64 Kbytes of SRAM address
space. The PCnet-ISA controller provides SROE and
SRWE outputs which can go directly to the OE and WE
pins of the SRAM, respectively. The address lines are
connected as described in the shared memory section
and the data lines go to the Private Data Bus.
AUI
The PCnet-ISA controller drives the AUI interface
through a set of transformers. The DI and CI inputs
should each be terminated with a pair of matched 39
or 40.2
node bypassed to ground with a .01
capacitor. Refer to the PCnet-ISA Technical Manual
(PID #16850B) for network interface design and refer to
Appendix A for a list of compatible AUI isolation
transformers.
resistors connected in series with the middle
A0–X
D0–7
A0–X
D0–7
OE
WE
A0–X
D0–7
CS
CS
OE
Ethernet
Address
PROM
PROM
SRAM
8-Bit
Boot
F to 0.1
CS
16907B-6
F