參數(shù)資料
型號: KS8721BA4 TR
廠商: Micrel Inc
文件頁數(shù): 9/35頁
文件大?。?/td> 0K
描述: TXRX 10/100 3.3V 48-SSOP
標準包裝: 1,000
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)
供應商設備封裝: 48-SSOP
包裝: 帶卷 (TR)
配用: 576-1006-ND - BOARD EVAL EXPERIMENT KS8721B
其它名稱: KS8721BA4TR
KS8721BA4TR-ND
Micrel, Inc.
KS8721BL/SL
June 2009
17
M9999-062509-1.3
still sends out its normal transmit pattern from MAC. FEF can be disabled by strapping pin 27 low. Refer to the
“Strapping Options” section.
Media Converter Operation
The KS8721BL/SL is capable of performing media conversion with two 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 (pins 21 and 22 strapped high). One
part is operating in TX mode and the other is operating in FX mode. Both parts can share a common 50MHz oscillator.
Under this operation, auto-negotiation on the TX side prohibits 10BASE-T link-up. Additional options can be
implemented under this operation. Disable the transmitter and set it at tri-state by controlling the high TXD2 pin. In order
to do this, RXD2 and TXD2 pins need to be connected via inverter. When TXD2 pin is high in both the copper and ber
operation, it is disabled transmit. Meanwhile, the RXD2 pin on the copper side serves as the energy detect and can
indicate if a line signal is detected. TXD3 should be tied low and RXD3 let oat. Please contact your Micrel FAE for a
media converter reference design.
Rx +/-
Tx +/-
FTx
FRx
Pin
34
TxD
(Fiber Mode)
21 22
Pin
21 22
50MHz
VCC
OSC
TxC/
Ref_CLK
TxC/
Ref_CLK
RxD
VCC
KS8721BL/SL
To the SD pin of the
Fiber Module
TxD
Figure 3. Fiber Module
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