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參數(shù)資料
| 型號： | CDK8920A |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER |
| 中文描述： | 水晶藍的ISA即插即用，即插即用以太網控制器 |
| 文件頁數(shù)： | 4/144頁 |
| 文件大?。?/td> | 1229K |
| 代理商： | CDK8920A |
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1.0
INTRODUCTION
1.1
General Description
The CS8920A is a single-chip, ISA Plug-and-
Play, full-duplex, Ethernet solution,
incorporating all of the analog and digital cir-
cuitry needed for a complete Ethernet
circuit. Major functional blocks include: indus-
try-standard plug-and-play protocol engine, a
direct ISA-bus interface, an 802.3 MAC engine
with auto-negotiation and wake-up frame recog-
nition capability, integrated buffer memory; a
serial EEPROM interface, and a complete analog
front end with both 10BASE-T and AUI.
Plug and Play
The CS8920A implements Plug and Play in ac-
cordance with the Intel/Microsoft Plug and Play
ISA Specification Version 1.0a, allowing inter-
rupts, DMA channels, IO base address, memory
base address, and optional BootPROM address
to be selected dynamically, by either a system
BIOS, an operating system or an application pro-
gram such as the Configuration Manager. The
CS8920A supports 11 interrupts and 3 DMA
channels.
Direct ISA-Bus Interface
The CS8920A has a direct ISA-bus interface
with full 24 mA drive capability. The CS8920A
operates in either 24-bit memory space, 16-bit
I/O space, or with external DMA controllers
(three 16-bit channels), providing maximum de-
sign flexibility.
Integrated Memory
The CS8920A incorporates a 4-Kbyte page of
on-chip memory, eliminating the cost and board
area associated with external memory chips. Un-
like most other Ethernet controllers, the
CS8920A buffers entire transmit and receive
frames on chip, eliminating the need for com-
plex, inefficient memory management schemes.
The on-chip buffer manager supports full-duplex
operation.
802.3 Ethernet MAC Engine
The CS8920A’s Ethernet Media Access Control
(MAC) engine is fully compliant with the IEEE
802.3 Ethernet standard (ISO/IEC 8802-3, 1993),
and supports full-duplex operation. The full-du-
plex mode may be entered by a command from
the host, or via auto-negotiation using link-pulse
signaling.
Magic Packet Frames
The MAC machine recognizes Magic Packet
frames, and can send a wakeup signal to a sys-
tem power management chip via a dedicated
control line or via an interrupt pin.
EEPROM Interface
The CS8920A provides a simple serial
EEPROM interface that allows configuration in-
formation to be stored in EEPROM, and then
loaded automatically at power-up.
Complete Analog Front End
The CS8920A’s analog front end incorporates a
Manchester encoder/decoder, clock recovery cir-
cuit, 10BASE-T transceiver, and complete
Attachment Unit Interface (AUI). It provides
manual and automatic selection of either
10BASE-T or AUI, and offers three on-chip
LED drivers for link status, bus status, and Eth-
ernet line activity.
The 10BASE-T transceiver includes drivers, re-
ceivers, and analog filters, allowing direct
connection to low-cost isolation transformers. It
supports 100, 120, and
150
shielded and un-
shielded cables, extended cable lengths.
CS8920A
4
DS238PP1
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