am79c961a Advanced Micro Devices, am79c961a Datasheet - Page 133

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

Static RAM Interface (for Shared Memory
Only)
The SRAM is an 8Kx8 or 32Kx8 device. The PCnet-ISA
II controller can support 64 Kbytes of SRAM address
space. The PCnet-ISA II controller provides SROE and
SRWE outputs which can go directly to the OE and
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 II controller drives the AUI through a set
of transformers. The DI and CI inputs should each be
terminated with a pair of matched 39
tors connected in series with the middle node bypassed
to ground with a.01 F to 0.1 F 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.
PCnet-ISA II
Controller
A13–A0
CE
OE
16K x 8 EPROM
27C128
10BASE-T External Components and Hookup
DQ7–DQ0
TXD+
TXP+
TXD-
TXP-
RXD+
RXD-
or 40.2
61.9
422.0
422.0
61.9
19364B-29
resis-
Am79C961A
1.21 K
100
EEPROM Interface
The suggested EEPROM is the industry standard
93C56 2 Kbit serial EEPROM. This is used in the 16-bit
mode to provide 128 x 16-bit EEPROM locations to
store configuration information as well as the Plug and
Play information.
10BASE-T Interface
The diagram below shows the proper 10BASE-T network
interface design. Refer to the PCnet Family Technical
Manual (PID #18216A) for more design details, and refer
to Appendix A for a list of compatible 10BASE-T filter/
transformer modules.
PRDB2/EEDO
PRDB0/EESK
Filter
Filter
Transformer
RCV
PRDB1/EEDI
XMT
Filter &
Module
EECS
1:1
1:1
Boot PROM Example
CS
DO
DI
CLK
93C56
Connector
TD+
TD-
ORG
RD+
RD-
RJ45
19364B-31
1
2
3
6
V
CC
19364B-30
133