参数资料
型号: MC68838FCC
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 1 CHANNEL(S), 125M bps, FDDI CONTROLLER, CQFP120
封装: CERAMIC, QFP-120
文件页数: 4/100页
文件大小: 465K
代理商: MC68838FCC
MOTOROLA
MC68838 USER’S MANUAL
1-1
SECTION 1
INTRODUCTION
The MC68838 media access controller (MAC) chip implements the MAC protocol for a
station operating under the ANSI standard for FDDI LANs (see Figure 1-1). FDDI is a
125-Mbit/sec, fiber-optic-based token ring designed to accommodate rings up to 1000
stations, 2 km between stations, and 200-km total ring length.
USER SYSTEM BUS
HOST PROCESSOR
SHARED MEMORY
FSI - MC68839
MAC - MC68838
ELM - MC68837
FCG - MC68836
CAM INTERFACE
USER SYSTEM
PAL
PIN
AMPLIFIER
DRIVER
LED
FROM FIBER-OPTIC CABLE
TO FIBER-OPTIC CABLE
OPTIONAL
EXTERNAL CAM
Figure 1-1. Motorola FDDI Architecture
The ANSI standard specifies the data link MAC layer, the physical and physical-media-
dependent entities, and the station management and submanagement physical
connection management.
The MAC protocol, the lower sublayer of the data link layer, provides for fair and
deterministic sharing of the physical medium, address recognition, FCS generation and
verification, frame insertion, frame repetition, frame removal, token generation, and
certain error recovery procedures.
ARCHIVE
INFORMA
TION
ARCHIVE
INFORMA
TION
相关PDF资料
PDF描述
MC68EC020FG 32-BIT, 25 MHz, MICROCONTROLLER, PQFP100
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