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| 型號： | MCP4251-503E/SL |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 22/59頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 2CH 14SOIC |
| 標準包裝： | 57 |
| 接片： | 257 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標準值 150 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 4 線 SPI（芯片選擇） |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 14-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 676 (CN2011-ZH PDF) |
| 其它名稱： | MCP4251-503-E/SL MCP4251-503-E/SL-ND |
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Micrel, Inc.
KSZ8051MNL/RNL
July 2010
29
M9999-070910-1.0
Interrupt (INTRP)
INTRP (pin 21) is an optional interrupt signal that is used to inform the external controller that there has been a status
update to the KSZ8051MNL/RNL PHY register. Register 1Bh, bits [15:8] are the interrupt control bits to enable and
disable the conditions for asserting the INTRP signal. Register 1Bh, bits [7:0] are the interrupt status bits to indicate which
interrupt conditions have occurred. The interrupt status bits are cleared after reading register 1Bh.
Register 1Fh, bit 9 sets the interrupt level to active high or active low. The default is active low.
The MII management bus option gives the MAC processor complete access to the KSZ8051MNL/RNL control and status
registers. Additionally, an interrupt pin eliminates the need for the processor to poll the PHY for status change.
HP Auto MDI/MDI-X
HP Auto MDI/MDI-X configuration eliminates the confusion of whether to use a straight cable or a crossover cable
between the KSZ8051MNL/RNL and its link partner. This feature allows the KSZ8051MNL/RNL to use either type of cable
to connect with a link partner that is in either MDI or MDI-X mode. The auto-sense function detects transmit and receive
pairs from the link partner, and then assigns transmit and receive pairs of the KSZ8051MNL/RNL accordingly.
HP Auto MDI/MDI-X is enabled by default. It is disabled by writing a one to register 1Fh, bit 13. MDI and MDI-X mode is
selected by register 1Fh, bit 14 if HP Auto MDI/MDI-X is disabled.
An isolation transformer with symmetrical transmit and receive data paths is recommended to support auto MDI/MDI-X.
The IEEE 802.3 Standard defines MDI and MDI-X as follows:
MDI
MDI-X
RJ-45 Pin
Signal
RJ-45 Pin
Signal
1
TX+
1
RX+
2
TX-
2
RX-
3
RX+
3
TX+
6
RX-
6
TX-
Table 6. MDI/MDI-X Pin Definition
Straight Cable
A straight cable connects a MDI device to a MDI-X device, or a MDI-X device to a MDI device. The following figure depicts
a typical straight cable connection between a NIC card (MDI) and a switch, or hub (MDI-X).
Figure 6. Typical Straight Cable Connection
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