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參數(shù)資料
| 型號(hào)： | KS8993ML |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 13/85頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | * |
| 類型： | * |
| 應(yīng)用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-BFQFP |
| 供應(yīng)商設(shè)備封裝： | 128-PQFP（14x20） |
| 包裝： | 散裝 |
| 配用： | 576-1016-ND - BOARD EVAL FOR KS8993ML |
| 其它名稱： | 576-1015 |
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Micrel, Inc.
KS8993M/ML/MI
April 2005
20
M9999-041205
Functional Description
The KS8993M contains two 10/100 physical layer transceivers and three MAC units with an integrated Layer 2
managed switch.
The KS8993M has the flexibility to reside in either a managed or unmanaged design. In a managed design, the
host processor has complete control of the KS8993M via the SMI interface, MIIM interface, SPI bus, or I
2C bus.
An unmanaged design is achieved through I/O strapping and/or EEPROM programming at system reset time.
On the media side, the KS8993M supports IEEE 802.3 10BASE-T and 100BASE-TX on both PHY ports, and
100BASE-FX on PHY port 1. The KS8993M can be used as a media converter.
The KS8993ML is the single supply version with all the identical rich features of the KS8993M. In the KS8993ML
version, pin number 22 provides 1.8V output power to the KS8993ML’s VDDC, VDDA, and VDDAP power pins. Refer
to the Pin Description table for information about pin 22 (Pin Description and I/0 Assignment).
Physical signal transmission and reception are enhanced through the use of patented analog circuitries that make
the design more efficient and allow for lower power consumption and smaller chip die size.
Functional Overview: Physical Layer Transceiver
100BASE-TX Transmit
The 100BASE-TX transmit function performs parallel to serial conversion, 4B/5B coding, scrambling, NRZ to
NRZI conversion, MLT3 encoding and transmission. The circuit starts with a parallel-to-serial conversion, which
converts the MII data from the MAC into a 125MHz serial bit stream. The data and control stream is then
converted into 4B/5B coding and followed by a scrambler. The serialized data is further converted from NRZ to
NRZI format, and then transmitted in MLT3 current output. The output current is set by an external 1% 3.01 K
resistor for the 1:1 transformer ratio. It has a typical rise/fall time of 4ns and complies with the ANSI TP-PMD
standard regarding amplitude balance, overshoot, and timing jitter. The wave-shaped 10BASE-T output is also
incorporated into the 100BASE-TX transmitter.
100BASE-TX Receive
The 100BASE-TX receiver function performs adaptive equalization, DC restoration, MLT3 to NRZI conversion,
data and clock recovery, NRZI to NRZ conversion, de-scrambling, 4B/5B decoding and serial-to-parallel
conversion. The receiving side starts with the equalization filter to compensate for inter-symbol interference (ISI)
over the twisted pair cable. Since the amplitude loss and phase distortion is a function of the length of the cable,
the equalizer has to adjust its characteristics to optimize the performance. In this design, the variable equalizer
will make an initial estimation based on comparisons of incoming signal strength against some known cable
characteristics, then it tunes itself for optimization. This is an ongoing process and can self adjust against
environmental changes such as temperature variations.
The equalized signal then goes through a DC restoration and data conversion block. The DC restoration circuit is
used to compensate for the effect of base line wander and improve the dynamic range. The differential data
conversion circuit converts the MLT3 format back to NRZI. The slicing threshold is also adaptive.
The clock recovery circuit extracts the 125MHz clock from the edges of the NRZI signal. This recovered clock is
then used to convert the NRZI signal into the NRZ format. The signal is then sent through the de-scrambler
followed by the 4B/5B decoder. Finally, the NRZ serial data is converted to the MII format and provided as the
input data to the MAC.
相關(guān)PDF資料 |
PDF描述 |
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| KS8995MAI | IC SWITCH 10/100 5PORT 128PQFP |
| KS8995MI | IC SWITCH 10/100 5PORT 128PQFP |
| KS8995XA | IC SWITCH 10/100 5PORT 128PQFP |
| KS8997 | IC SWITCH 10/100 8PORT 128PQFP |
| KS8999I | IC SWITCH 9-PORT 10/100 208-PQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8993ML-EVAL | 功能描述:BOARD EVAL FOR KS8993ML RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| KS8995 | 制造商:KENDIN 功能描述:KS8995 制造商:Micrel Inc 功能描述:SPECIAL FUNCTION IC, Silicon Manufacturer:Micrel Semiconductor, Silicon Core Num |
| KS8995E | 制造商:Micrel Inc 功能描述: |
| KS8995E-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8995E RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| KS8995FQ | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 5-Port 10/100 Managed Switch |
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