CS8920 Просмотр технического описания (PDF) - Cirrus Logic
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CS8920 Datasheet PDF : 66 Pages
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CS8920 Technical Reference Manual
1.0 Introduction to CS8920
Technical Reference Manual
This Manual provides the information
which will be helpful in designing a board
using the CS8920, programming the
associated EEPROM, and installing and
running the CS8920 device drivers. It is
expected that the user of this Technical
Reference Manual will have a general
knowledge of hardware design, Ethernet,
the ISA bus, and networking software.
Recommended sources of background
information are:
a) ISA System Architecture by Shanley
and Anderson, Mindshare Press, 1992,
ISBN 1-881609-05-7
b) Ethernet, Building a Communication
Infrastructure, by Hegering and Lapple,
Addison-Wesley, 1993, ISBN 0-201-
62405-2
c) Netware Training Guide: Networking
Technologies, by Debra Niedenmiller-
Chaffis, New Riders Publishing, ISBN
1-56205-363-9
As shown in the Figure 1.1, the CS8920
requires a minimum number of external
components. The EEPROM stores
configuration information such as interrupt
number, DMA channel, I-O base address,
memory base address, and IEEE Individual
Address. The EEPROM can be eliminated
on a PC motherboard if that information in
stored in the system CMOS. Note also that
the Boot PROM is only needed for diskless
workstations that boot DOS at system
power up, over the network. Also, the LEDs
are optional.
ISA Bus
57
pins
EEPROM:
Stores Configuration
Information &
IEEE Address
EEPROM
Control
RAM
LED
Control
Clock
10BASE-T
RX Filters &
Receiver
ISA
Bus
Logic
Memory
Manager
Media Access
Control
(MAC).
Ethernet
protocol
processing.
Encoder,
Decoder
&
PLL
Boundary
Scan
Test Logic
Power
Manage
10BASE-T
TX Filters &
Transmitter
AUI
Transmitter
AUI
Collision
AUI
Receiver
Boot PROM:
Used to boot diskless
workstations.
Figure 1.1 - Hardware Application Summary
10BASE-T
Transformer
AUI
Transformer
(Attachment
Unit
Interface)
AN84REV1
6
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