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參數(shù)資料
| 型號： | KSZ8721BI |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 8/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX PHY 10/100 2.5V 48SSOP |
| 標準包裝： | 30 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | MII，RMII |
| 電源電壓： | 2.375 V ~ 2.625 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-BSSOP（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 48-SSOP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1080 (CN2011-ZH PDF) |
| 配用： | 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC 576-1626-ND - BOARD EVALUATION FOR KSZ8721BL |
| 其它名稱： | 576-1027 |
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KS8721B/BT
Micrel, Inc.
M9999-030106
16
March 2006
Power Management
The KS8721B/BT offers the following modes for power management:
Power Down Mode: This mode can be achieved by writing to Register 0.11 or pulling pin 30 PD# Low.
Power Saving Mode: This mode can be disabled by writing to Register 1fh.10. The KS8721B/BT will then turn
off everything except for the Energy Detect and PLL circuits when the cable is not installed. In other words, the
KS8721B/BT will shutdown most of the internal circuits to save power if there is no link. Power saving mode will
be in his most effective state when auto-negotiation mode is enable.
100BT FX Mode
100BT FX mode is activated when FXSD/FXEN is higher 0.6V (This pin has a default pull down). Under this mode, the auto-
negotiation and auto-MDIX features are disabled.
In ber operation FXSD pin should connect to the SD (signal detect) output of the ber module. The internal threshold of
FXSD is around 1/2 VDD ±50mV (1.25V ±0.05V). Above this level, it is considered ber signal detected, and the operation
is summarized in the following table:
FXSD/FXEN
Condition
Less than 0.6V
100TX mode
Less than 1.25V,
FX mode
but greater than 0.6V
No signal detected
FEF generated
Greater than 1.25
FX mode
signal detected
Table 1. 100BT FX Mode
To ensure a proper operation, the swing of ber module SD should cover the threshold variation. A resistive voltage divider
is recommended to adjust the SD voltage range.
FEF (Far End Fault), repetition of a special pattern which consists of 84-one and 1-zero, is generated under “FX mode with
no signal detected.” The purpose of FEF is to notify the sender of a faulty link. When receiving a FEF, the LINK will go down
to indicate a fault, even with ber signal detected. The transmitter does not affect by receiving a FEF and still sends out its
normal transmit pattern from MAC. FEF can be disabled by strapping pin 27 low. Refer to “Strapping Options” section.
“Strapping Options”
Media Converter Operation
KS8721B/BT is capable of performing media conversion with 2 parts in a back to back RMII loop-back mode as indicated in
the diagram. Both parts are in RMII mode and with RMII BTB asserted (pin 21 and 22 strapped high). One part is operating
at TX mode and the other in FX mode. Both parts can share a common 50MHz oscillator.
Under this operation, auto-negotiation on the TX side will prohibit 10baseT link up. TXD2, active High, can disable transmit-
ter and set it at tri-state. RXD2 serves as energy detection can indicate if there is line signal detected. TXD3 should tied low
and RXD3 let oat. Please contact Micrel FAE for Application Note.
KS8721B
Rx +/-
Tx +/-
FTx
FRx
KS8721B
Vcc
Pin
34
RxD
TxD
To the SD pin of the
Fiber Module
(Fiber Mode)
Vcc
RxD
TxD
21 22
Pin
21 22
OSC
50 MHz
TxC/
Ref_CLK
TxC/
Ref_CLK
Figure 3. Fiber Module
FXSD/FXEN
Condition
Less than 0.6V
100TX mode
Less than 1.25V,
FX mode
but greater than 0.6V
No signal detected
FEF generated
Greater than 1.25
FX mode
signal detected
FXSD/FXEN
Condition
Less than 0.6V
100TX mode
Less than 1.25V,
FX mode
but greater than 0.6V
No signal detected
FEF generated
Greater than 1.25
FX mode
signal detected
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| KSZ8721BI TR | 功能描述:以太網(wǎng) IC 10/100 BASE-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-SSOP, I-Temp, Lead Free RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)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 |
| KSZ8721BL | 功能描述:以太網(wǎng) IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-LQFP (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)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 |
| KSZ8721BL A4 | 制造商:Micrel Inc 功能描述:PHY 1-CH 10Mbps/100Mbps 48-Pin LQFP |
| KSZ8721BL A4 TR | 制造商:Micrel Inc 功能描述:PHY 1-CH 10Mbps/100Mbps 48-Pin LQFP T/R |
| KSZ8721BL TR | 功能描述:以太網(wǎng) IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-LQFP (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)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 |
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