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參數(shù)資料
| 型號： | AM79C873KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡接口 |
| 英文描述： | NetPHY⑩ -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大?。?/td> | 543K |
| 代理商： | AM79C873KCW |
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14
Am79C873
P R E L I M I N A R Y
Figure 3.
100BASE Transmitter Functional Block Diagram
The block diagram in Figure 3 provides an overview of
the functional blocks contained in the transmit section.
The transmitter section contains the following func-
tional blocks:
I
4B5B Encoder
I
Scrambler
I
Parallel-to-Serial Converter
I
NRZ-to-NRZI Converter
I
PECL Driver (For FX Operation)
I
NRZI to MLT-3 (For TX Operation)
I
MLT-3 Driver (For TX Operation)
4B5B Encoder
The 4B5B encoder converts 4-bit (4B) nibble data gen-
erated by the MAC Reconciliation Layer into a 5-bit
(5B) code group for transmission (see Table 1). This
conversion is required for control and packet data to be
combined in code groups. The 4B5B encoder substi-
tutes the first 8 bits of the MAC preamble with a J/K
code-group pair (11000 10001) upon transmit.
The 4B5B encoder continues to replace subsequent
4B preamble and data nibbles with corresponding 5B
code-groups. At the end of the transmit packet, upon
the deassertion of the Transmit Enable signal from the
MAC Reconciliation layer, the 4B5B encoder injects the
T/R code-group pair (01101 00111) indicating end of
frame. After the T/R code-group pair, the 4B5B encoder
continuously injects IDLEs into the transmit data
stream until Transmit Enable is asserted and the next
transmit packet is detected.
The NetPHY-1 device includes a Bypass 4B5B conver-
sion option within the 100BASE-TX transmitter for sup-
port of applications like 100 Mbps repeaters which do
not require 4B5B conversion.
MII
Signals
MII
Interface/
Control
4B/5B
Encoder
Register
Rise/Fall
Time
CTL
TX CGM
LED
Driver
Carrier
Sense
10BASE-T
Module
RX
LED1-4#
25M OSCI
RXI
±
10TXD
±
100TXD
±
PECL
Driver
FXTD
±
NRZ
to
NRZI
NRZI to
MLT-3
MLT-3
Driver
Parallel
to Serial
Scrambler
Collision
Detection
Auto-
Negotiation
TX
22164A-5
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相關代理商/技術參數(shù) |
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| AM79C874 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver |
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