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| 型号： | ICS1893AFILFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 79/136页 |
| 文件大小： | 0K |
| 描述： | PHYCEIVER LOW PWR 3.3V 48-SSOP |
| 标准包装： | 1,000 |
| 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： | 带卷 (TR) |
| 其它名称： | 1893AFILFT |
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Chapter 7
Functional Blocks
ICS1893AF, Rev. D 10/26/04
October, 2004
47
ICS1893AF Data Sheet - Release
Copyright 2004, Integrated Circuit Systems, Inc.
All rights reserved.
7.5
Functional Block: 10Base-T Operations
When configured for 10Base-T mode, the ICS1893AF MAC/Repeater Interface can be configured to
provide either a 10M MII (Media Independent Interface) or a 10M Serial Interface. The Twisted-Pair
Interface is automatically configured to provide a two-level, Manchester-encoded signal at the voltage
levels specified in the ISO/IEC standard. (For more information on the Twisted-Pair Interface, see Section
The 10Base-T and 100Base-TX operations differ as follows. 10Base-T operations are fundamentally
simpler than 100Base-TX operations. The data rate is slower, requiring less encoding than 100Base-TX
operations. In addition, the bandwidth requirements (and therefore the line attenuation issues) are not as
severe as with 100-MHz operations. Consequently, when an ICS1893AF is set for 10Base-T operations, it
requires fewer internal circuits in contrast to 100Base-TX operations. (For an overview of 10Base-T
operations, see Section 5.6, “10Base-T Operations”.).
7.5.1
10Base-T Operation: Manchester Encoder/Decoder
During data transmission the ICS1893AF acquires data from its MAC/Repeater Interface in either 4-bit
nibbles or as a serial bit stream. The ICS1893AF converts this data into a Manchester-encoded signal for
presentation to its MDI, as required by the ISO/IEC specification.
In a Manchester-encoded signal, all logic:
Ones are:
– Positive during the first half of the bit period
– Negative during the second half of the bit period
Zeros are:
– Negative during the first half of the bit period
– Positive during the second half of the bit period
During 10Base-T data reception, a Manchester Decoder translates the serial bit stream obtained from the
Twisted-Pair Receiver (MDI) into an NRZ bit stream. The Manchester Decoder then passes the data to the
MAC/Repeater Interface in either serial or parallel format, depending on the interface configuration.
Manchester-encoded signals have the following advantages:
Every bit period has an encoded clock.
The split-phase nature of the signal always provides a zero DC level regardless of the data (that is, there
is no baseline wander phenomenon).
The primary disadvantage in using Manchester-encoded signals is that it doubles the data rate, making it
operationally prohibitive for 100-MHz operations.
7.5.2
10Base-T Operation: Clock Synthesis
The ICS1893AF synthesizes the clocks required for synchronizing data transmission. In 10Base-T mode,
the MAC Interface provides a 10M MII (Media Independent Interface):
10M MII interface, the ICS1893AF synthesizes a 2.5-MHz clock for nibble-wide transactions
7.5.3
10Base-T Operation: Clock Recovery
The ICS1893AF recovers its receive clock from the Manchester-encoded data stream obtained from its
Twisted-Pair Receiver using a phase-locked loop (PLL). The ICS1893AF then uses this recovered clock for
synchronizing data transmission between itself and the MAC. Receive-clock PLL acquisitions begin with
reception of the MAC Frame Preamble and continue as long as the ICS1893AF is receiving data.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS1893AFIT | 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) |
| ICS1893AFLF | 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 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:4.5 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 其它名称:ISL31470EIBZ-T7ACT |
| ICS1893AFLFT | 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) |
| ICS1893AFT | 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) |
| ICS1893AG | 制造商:ICS 制造商全称:ICS 功能描述:3.3 V 10Base-T/100Base-TX Integrated PHYceiver-TM |
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