参数资料
型号: ICS1893BFILF
厂商: IDT, Integrated Device Technology Inc
文件页数: 67/133页
文件大小: 0K
描述: PHYCEIVER LOW PWR 3.3V 48-SSOP
标准包装: 30
系列: PHYceiver™
类型: PHY 收发器
规程: MII
电源电压: 3.14 V ~ 3.47 V
安装类型: 表面贴装
封装/外壳: 48-BSSOP(0.295",7.50mm 宽)
供应商设备封装: 48-SSOP
包装: 管件
其它名称: 1893BFILF
Chapter 6 Functional Blocks
ICS1893BF, Rev. F, 5/13/10
May, 2010
39
ICS1893BF Data Sheet Rev. F - Release
Copyright 2009, IDT, Inc.
All rights reserved.
6.3.6 4B/5B Encoding/Decoding
The 4B/5B encoding methodology maps each 4-bit nibble to a 5-bit symbol (also called a “code group”).
There are 32 five-bit symbols, which include the following:
Of the 32 five-bit symbols, 16 five-bit symbols are required to represent the 4-bit nibbles.
The remaining 16 five-bit symbols are available for control functions. The IEEE Standard defines 6
symbols for control, and the remaining 10 symbols of this grouping are invalid. The 6 control symbols
include the following:
– /H/, which represents a Halt, also used to signify a Transmit Error
– /I/, which represents an IDLE
– /J/, which represents the first symbol of the Start-of-Stream Delimiter (SSD)
– /K/, which represents the second symbol of the Start-of-Stream Delimiter (SSD)
– /T/, which represents the first symbol of the End-of-Stream Delimiter (ESD)
– /R/, which represents the second symbol of the End-of-Stream Delimiter (ESD)
If the ICS1893BF PCS receives:
– One of the 10 undefined symbols, it sets its QuickPoll Detailed Status Register’s Invalid Symbol bit
(bit 17.7) to logic one.
– A Halt symbol, it sets the Halt Symbol Detected bit in its QuickPoll Detailed Status Register (bit 17.6)
to logic one.
Note: An STA can force the ICS1893BF to transmit symbols that are typically classified as invalid, by
both (1) setting the Extended Control Register’s Transmit Invalid Codes bit (bit 16.2) to logic one
and (2) asserting the associated TXER signal. For more information, see Section 7.11.7, “Invalid
6.4 Functional Block: 100Base-TX TP-PMD Operations
The ICS1893BF supports both 10Base-T and 100Base-TX operations. For 100Base-TX operations, the
TP-PMD module performs stream-cipher scrambling/descrambling and MLT-3 encoding/decoding (3-level,
multi-level transition) in compliance with the ANSI Standard X3.263: 199X FDDI TP-PMD as defined in the
specification for 100Base-TX Twisted-Pair Physical Media Dependent (TP-PMD) Sublayer. The
ICS1893BF’s TP-PMD also performs DC restoration (that is, baseline wander correction) and adaptive
equalization on the received signals.
Note:
1. For an overview of 100Base-TX operations, see Section 4.5, “100Base-TX Operations”.
2. For more information on the Twisted-Pair Interface, see Section 5.3, “Twisted-Pair Interface”.
6.4.1 100Base-TX Operation: Stream Cipher Scrambler/Descrambler
When the ICS1893BF is operating in 100Base-TX mode, it employs a stream cipher
scrambler/descrambler that complies with the ANSI Standard X3.263: 199X FDDI TP-PMD. The purpose of
the stream cipher scrambler is to spread the transmission spectrum to minimize electromagnetic
compatibility problems. The stream cipher descrambler restores the received serial bit stream to its
unscrambled form.
The ICS1893BF “seeds” (that is, initializes) the Transmit Stream Cipher Shift register by using the
ICS1893BF PHY address from Table 7-16, which minimizes crosstalk and noise in repeater applications.
The MAC Interface bypasses the stream cipher scrambler/descrambler when in the 100M Symbol Interface
mode.
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ICS1893BFILFT 功能描述:PHYCEIVER LOW PWR 3.3V 48-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:PHYceiver™ 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP(0.173",4.40mm 宽) 供应商设备封装:16-TSSOP 包装:带卷 (TR)
ICS1893BFIT 功能描述:PHYCEIVER LOW PWR 3.3V 48-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:PHYceiver™ 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC(0.295",7.50mm 宽) 供应商设备封装:16-SOIC 包装:带卷 (TR)
ICS1893BFLF 功能描述:PHYCEIVER LOW PWR 3.3V 48-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:PHYceiver™ 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP(0.173",4.40mm 宽) 供应商设备封装:16-TSSOP 包装:带卷 (TR)
ICS1893BFLFT 功能描述:PHYCEIVER LOW PWR 3.3V 48-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:PHYceiver™ 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP(0.173",4.40mm 宽) 供应商设备封装:16-TSSOP 包装:带卷 (TR)
ICS1893BFT 功能描述:PHYCEIVER LOW PWR 3.3V 48-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:PHYceiver™ 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC(0.295",7.50mm 宽) 供应商设备封装:16-SOIC 包装:带卷 (TR)