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參數(shù)資料
| 型號： | KS8721CL |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 6/32頁 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 3.3V 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | IEEE 802 |
| 電源電壓： | 2.375 V ~ 2.625 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
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KS8721CL
Micrel
M9999-100804
14
October 2004
to the RMII. TX_EN is negated prior to the first REF_CLK following the final di-bit of a frame. TX_EN transitions synchronously
with respect to REF_CLK.
Transmit Data [1:0] (TXD[1:0])
Transmit Data TXD[1:0] transitions synchronously with respect to REF_CLK. When TX_EN is asserted, TXD[1:0] are accepted
for transmission by the PHY. TXD[1:0] remains as “00” to indicate idle when TX_EN is de-asserted. Values of TXD[1:0] other
than “00” when TX_EN is de-asserted are reserved for out-of-band signalling (to be defined). Values other than “00” on
TXD[1:0] while TX_EN is de-asserted are ignored by the PHY.
Collision Detection
Since the definition of CRS_DV and TX_EN both contain an accurate indication of the start of frame, the MAC reliably
regenerates the COL signal of the MII by ending TX_EN and CRS_DV.
During the IPG time following the successful transmission of a frame, the COL signal is asserted by some transceivers as a
self-test. The Signal Quality Error (SQE) function is not supported by the reduced MII due to the lack of the COL signal.
Historically, SQE was present to indicate that a transceiver located physically remote from the MAC was functioning. Since
the reduced MII only supports chip-to-chip connections on a PCB, SQE functionality is not required.
RX_ER
The PHY provides RX_ER as an output according to the rules specified in IEEE 802.3u [2] (see Clause 24, Figure 24-11–
Receive State Diagram). RX_ER is asserted for one or more REF_CLK periods to indicate that an error (e.g., a coding error
or any error that a PHY is capable of detecting, and that may otherwise be undetectable by the MAC sublayer) is detected
somewhere in the frame presently being transferred from the PHY. RX_ER transitions synchronously with respect to
REF_CLK. While CRS_DV is de-asserted, RX_ER has no effect on the MAC.
RMII AC Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
REF_CLK Frequency
50
MHz
REF_CLK Duty Cycle
35
65
%
t
SU
TXD[1:0], TX_EN, RXD[1:0], CRS_DV, RXER
4
ns
t
H
TXD[1:0], TX_EN, RXD[1:0], CRS_DV, RXER
2
ns
Data Hold from REF_CLK
Rising Edge
Unused RMII Pins
Input Pins
TXD[2:3] and TXER are pull-down to GND.
Output Pins
RXD[2:3] and RXC are no connect.
Note that the RMII pin needs to be pulled up to enable RMII mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8721CL_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver |
| KS8721SL | 功能描述:TXRX 10/100 3.3V 48-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SL TR | 功能描述:IC TXRX PHY 10/100 3.3V 48SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SLA4 | 功能描述:TXRX 10/100 3.3V 48-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SLA4 TR | 功能描述:TXRX 10/100 3.3V 48-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
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