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參數(shù)資料
| 型號(hào)： | KS8993ML |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 14/85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
21
M9999-041205
PLL Clock Synthesizer
The KS8993M generates 125MHz, 31.25MHz, 25MHz, and 10MHz clocks for system timing. Internal clocks are
generated from an external 25MHz crystal or oscillator.
Scrambler/De-scrambler (100BASE-TX Only)
The purpose of the scrambler is to spread the power spectrum of the signal in order to reduce EMI and baseline
wander. Transmitted data is scrambled through the use of an 11-bit wide linear feedback shift register (LFSR).
The scrambler can generate a 2047-bit non-repetitive sequence. The receiver will then de-scramble the incoming
data stream with the same sequence at the transmitter.
100BASE-FX Operation
100BASE-FX operation is very similar to 100BASE-TX operation with the differences being that the scrambler /
de-scrambler and MLT3 encoder / decoder are bypassed on transmission and reception. In 100BASE-FX mode,
the auto negotiation feature is bypassed since there is no standard that supports fiber auto negotiation. The auto-
MDI/MDI-X feature is also disabled.
100BASE-FX Signal Detection
In fiber operation, the KS8993M’s FXSD1 (fiber signal detect) input pin is usually connected to the fiber
transceiver’s SD (signal detect) output pin. 100BASE-FX mode is activated when the FXSD1 input pin is greater
than 1V. When FXSD1 is between 1V and 1.8V, no fiber signal is detected and a far end fault (FEF) is generated.
When FXSD1 is over 2.2V, the fiber signal is detected.
Alternatively, the designer may choose not to implement the FEF feature. In this case, the FXSD1 input pin is tied
high to force 100BASE-FX mode.
100BASE-FX signal detection is summarized in the following table:
Part Number
Mode
Less than 0.2V
TX mode
Greater than 1V, but less than 1.8V
FX mode
No signal detected.
Far-end fault generated
Greater than 2.2V I
FX mode
Signal detected
Table 1. FX and TX Mode Selection
To ensure proper operation, a resistive voltage divider is recommended to adjust the fiber transceiver’s SD output
voltage swing to match the KS8993M’s FXSD1 input voltage threshold.
100BASE-FX Far End Fault
An FEF occurs when the signal detection is logically false on the receive side of the fiber transceiver. The
KS8993M detects a FEF when its FXSD1 input is between 1.0V and 1.8V. When an FEF occurs, the transmission
side signals the other end of the link by sending 84 1’s followed by a zero in the idle period between frames.
Upon receiving an FEF, the LINK will go down (even when a fiber signal is detected) to indicate a fault condition.
The transmitting side is not affected when an FEF is received, and will continue to send out its normal transmit
pattern from the MAC. By default, FEF is enabled. The FEF feature can be disabled through register setting.
10BASE-T Transmit
The output 10BASE-T driver is incorporated into the 100BASE-T driver to allow transmission with the same
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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 |
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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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