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| 型号： | KSZ8041TL-EVAL |
| 厂商： | Micrel Inc |
| 文件页数： | 22/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION KSZ8041TL |
| 标准包装： | 1 |
| 主要目的： | 接口，以太网 PHY |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ8041TL |
| 主要属性： | 单芯片 PHY，100BASE-TX/100BASE-FX/10BASE-T |
| 次要属性： | MII，RMII，HP Auto MDI，MDI-X 自动极性校正，LinkMD |
| 已供物品： | 板 |
| 产品目录页面： | 1080 (CN2011-ZH PDF) |
| 相关产品： | 576-2971-5-ND - IC ETHERNET PHY IND 48-TQFP KSZ8041TL TR-ND - TRANSCEIVER 10/100 48-TQFP KSZ8041TLA3TR-ND - TRANSCEIVER 10/100 48-TQFP KSZ8041TLA3-ND - TRANSCEIVER 10/100 48-TQFP 576-1619-ND - TRANSCEIVER 10/100BASE 48-TQFP |
| 其它名称： | 576-3295 KSZ8041TL-EVAL-ND |
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Micrel, Inc.
KSZ8041TL/FTL
April 2007
29
M9999-042707-1.1
LinkMD
Cable Diagnostics
The LinkMD
feature utilizes time domain reflectometry (TDR) to analyze the cabling plant for common cabling problems,
such as open circuits, short circuits and impedance mismatches.
LinkMD
works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs, and then analyzing
the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault with
maximum distance of 200m and accuracy of +/-2m. Internal circuitry computes the TDR information and presents it in a
user-readable digital format.
Note: Cable diagnostics are only valid for copper connections and do not support fiber optic operation.
Access
LinkMD
is initiated by accessing register 1Dh, the LinkMD Control/Status Register, in conjunction with register 1Fh, the
PHY Control 2 Register.
Usage
The following test procedure demonstrates how to use LinkMD
for cable diagnostic:
1.
Disable auto MDI/MDI-X by writing a ‘1’ to register 1Fh bit 13 to enable manual control over the differential pair
used to transmit the LinkMD
pulse.
2.
Select the differential pair to transmit the LinkMD
pulse with register 1Fh bit 14.
3.
Start cable diagnostic test by writing a ‘1’ to register 1Dh bit 15. This enable bit is self-clearing.
4.
Wait (poll) for register 1Dh bit 15 to return a ‘0’, indicating cable diagnostic test is completed.
5.
Read cable diagnostic test results in register 1Dh bits [14:13]. The results are as follows:
00 = normal condition (valid test)
01 = open condition detected in cable (valid test)
10 = short condition detected in cable (valid test)
11 = cable diagnostic test failed (invalid test)
The ‘11’ case, invalid test, occurs if the KSZ8041TL/FTL is unable to shut down the link partner. In this instance,
the test is not run, since it would be impossible for the KSZ8041TL/FTL to determine if the detected signal is a
reflection of the signal generated by the KSZ8041TL/FTL, or a signal from its link partner.
6.
Get distance to fault by multiplying the decimal value in register 1Dh bits [8:0] by a constant of 0.4. The distance,
D (expressed in meters), to the cable fault is determined by the following formula:
D (distance to cable fault) = 0.4 x {decimal value of register 1Dh bits [8:0]}
The 0.4 constant can be calibrated for different cable types and cabling conditions, such as cables with velocity of
propagation that varies significantly from the norm.
Power Management
The KSZ8041TL/FTL offers the following power management modes:
Power Saving Mode
This mode is used to reduce power consumption when the cable is unplugged. It is in effect when auto-negotiation mode
is enabled, cable is disconnected, and register 1Fh bit 10 is set to 1 (default setting). Under power saving mode, the
KSZ8041TL/FTL shuts down all transceiver blocks, except for energy detect and PLL circuits. Additionally, in MII mode,
the RXC clock output is disabled. RXC clock is enabled after the cable is connected and link is established.
Power saving mode is disabled by writing a zero to register 1Fh bit 10.
Power Down Mode
This mode is used to power down the entire KSZ8041TL/FTL device when it is not in use. Power down mode is enabled
by writing a one to register 0h bit 11. In the power down state, the KSZ8041TL/FTL disables all internal functions, except
for the MII management interface.
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| KSZ8041TLI | 功能描述:以太网 IC Physical Layer Transceiver 10/100BASE-FX (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8041TLI TR | 功能描述:以太网 IC Physical Layer Transceiver 10/100BASE-FX (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8041TLI-S | 功能描述:以太网 IC Physical Layer Transceiver 10/100BASE-FX (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8041TL-S | 功能描述:以太网 IC Physical Layer Transceiver 10/100BASE-T/TX (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8051MLL | 功能描述:以太网 IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver w/ MII Support (48-LQFP) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
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