參數資料
| 型號： | KSZ8993M |
| 廠商： | Micrel Inc |
| 文件頁數： | 14/85頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128PQFP |
| 標準包裝： | 66 |
| 系列： | * |
| 類型： | * |
| 應用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-BFQFP |
| 供應商設備封裝： | 128-PQFP（14x20） |
| 包裝： | 托盤 |
| 產品目錄頁面： | 1081 (CN2011-ZH PDF) |
| 其它名稱： | 576-1037 |
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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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相關代理商/技術參數 |
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| KSZ8993MA5 | 功能描述:IC SWITCH 10/100 W/TXRX 128PQFP RoHS:是 類別:集成電路 (IC) >> 專用 IC 系列:* 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調幀器 應用:數據傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| KSZ8993M-EVAL | 功能描述:以太網開發(fā)工具 KSZ8993M Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8993MI | 功能描述:以太網 IC 2+1 Port 10/100 Switch w/Tranceivers & Frame Buffers, 128-Ld PQFP (Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8993ML | 功能描述:以太網 IC 2+1 Port 10/100 Switch w/Tranceivers & Frame Buffers, 128-Ld PQFP(Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8993ML-EVAL | 功能描述:以太網開發(fā)工具 KSZ8993ML Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
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