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DP83620 数据表(PDF) 8 Page - Texas Instruments

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部件名 DP83620
功能描述  DP83620 Industrial Temperature Single Port 10/100 Mbps Ethernet Physical Layer
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

DP83620 数据表(HTML) 8 Page - Texas Instruments

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DP83620
SNLS339C – JANUARY 2011 – REVISED APRIL 2013
www.ti.com
3.3
SERIAL MANAGEMENT INTERFACE
Signal Name
Pin Name
Type
Pin #
Description
MDC
MDC
I
31
MANAGEMENT DATA CLOCK: Synchronous clock to the MDIO
management data input/output serial interface which may be asynchronous
to transmit and receive clocks. The maximum clock rate is 25 MHz with no
minimum clock rate.
MDIO
MDIO
I/O
30
MANAGEMENT DATA I/O: Bi-directional management instruction/data
signal that may be sourced by the station management entity or the PHY.
This pin requires a 1.5 k
Ω pullup resistor. Alternately, an internal pullup may
be enabled by setting bit 3 in the CDCTRL1 register.
3.4
MAC DATA INTERFACE
Signal Name
Pin Name
Type
Pin #
Description
TX_CLK
TX_CLK
O
1
MII TRANSMIT CLOCK: 25 MHz Transmit clock output in 100 Mb/s mode
or 2.5 MHz in 10 Mb/s mode derived from the 25 MHz reference clock. The
MAC should source TX_EN and TXD[3:0] using this clock.
RMII MODE: Unused in RMII Slave mode. The device uses the X1
reference clock input as the 50 MHz reference for both transmit and
receive. For RMII Master mode, the device outputs the internally generated
50 MHz reference clock on this pin.
This pin provides an integrated 50 ohm signal termination, making external
termination resistors unnecessary.
TX_EN
TX_EN
I, PD
2
MII TRANSMIT ENABLE: Active high input indicates the presence of valid
data inputs on TXD[3:0].
RMII TRANSMIT ENABLE: Active high input indicates the presence of valid
data on TXD[1:0].
TXD_0
TXD_0
I
3
MII TRANSMIT DATA: Transmit data MII input pins, TXD[3:0], that accept
TXD_1
TXD_1
I
4
data synchronous to the TX_CLK (2.5 MHz in 10 Mb/s mode or 25 MHz in
TXD_2
TXD_2
I
5
100 Mb/s mode).
TXD_3
TXD_3
I, PD
6
RMII TRANSMIT DATA: Transmit data RMII input pins, TXD[1:0], that
accept data synchronous to the 50 MHz reference clock.
RX_CLK
RX_CLK
O
38
MII RECEIVE CLOCK: Provides the 25 MHz recovered receive clocks for
100 Mb/s mode and 2.5 MHz for 10 Mb/s mode.
RMII MODE: Unused in RMII Slave mode. The device uses the X1
reference clock input as the 50 MHz reference for both transmit and
receive. For RMII Master mode, the device outputs the internally generated
50 MHz reference clock on this pin.
This pin provides an integrated 50 ohm signal termination, making external
termination resistors unnecessary.
RX_DV
RX_DV
O, PD
39
MII RECEIVE DATA VALID: Asserted high to indicate that valid data is
present on the corresponding RXD[3:0].
RMII RECEIVE DATA VALID: This signal provides the RMII Receive Data
Valid indication independent of Carrier Sense.
This pin provides an integrated 50 ohm signal termination, making external
termination resistors unnecessary.
RX_ER
RX_ER
S, O, PU
41
MII RECEIVE ERROR: Asserted high synchronously to RX_CLK to indicate
that an invalid symbol has been detected within a received packet in 100
Mb/s mode.
RMII RECEIVE ERROR: Asserted high synchronously to X1 whenever a
media error is detected, and RX_DV is asserted in 100 Mb/s mode.
This pin is not required to be used by a MAC in RMII mode, since the PHY
is required to corrupt data on a receive error.
This pin provides an integrated 50 ohm signal termination, making external
termination resistors unnecessary.
RXD_0
RXD_0
S, O, PD
46
MII RECEIVE DATA: Nibble wide receive data signals driven synchronously
RXD_1
RXD_1
45
to the RX_CLK (25 MHz for 100 Mb/s mode, 2.5 MHz for 10 Mb/s mode).
RXD_2
RXD_2
44
RXD[3:0] signals contain valid data when RX_DV is asserted.
RXD_3
RXD_3
43
RMII RECEIVE DATA: 2-bits receive data signals, RXD[1:0], driven
synchronously to the 50 MHz reference clock.
These pins provide integrated 50 ohm signal terminations, making external
termination resistors unnecessary.
8
Pin Descriptions
Copyright © 2011–2013, Texas Instruments Incorporated
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