DP83822HF, DP83822IF, DP83822H, DP83822I
ZHCSFD6F –JULY 2016 –REVISED JUNE 2021
www.ti.com.cn
表6-1. Pin Functions (continued)
PIN
NAME
TYPE(1)
DESCRIPTION
NO.
Collision Detect: For Full-Duplex mode, this pin is always LOW. In Half-
Duplex mode, this pin is asserted HIGH only when both transmit and
receive media are non-idle.
COL / GPIO2
29
I/O, S-PU
Unused in RMII Mode
SERIAL MANAGEMENT INTERFACE
Management Data Clock: Synchronous clock to the MDIO serial
management input/output data. This clock may be asynchronous to the
MAC transmit and receive clocks. The maximum clock rate is 25 MHz.
There is no minimum clock rate.
MDC
20
19
I
Management Data I/O: Bidirectional management data signal that may
be sourced by the management station or the PHY. This pin requires a
2.2-kΩpullup resistor.
MDIO
I/O
Interrupt / Power Down: Register access is required for this pin to be
configured either as power down or as an interrupt. The default function
of this pin is power down. When this pin is configured for a power down
function, an active low signal on this pin places the device in power-down
mode.
INT/PWDN
8
I/O, OD
When this pin is configured as an interrupt pin, this pin is asserted low
when an interrupt condition occurs. The pin has an open-drain output with
a weak internal pullup. Some applications may require an external pullup
resistor.
RESET: This pin is an active low reset input that initializes or re-initializes
all the internal registers of the PHY. Asserting this pin low for at least 10
µs will force a reset process to occur.
RESET
18
I, PU
CLOCK INTERFACE
Crystal / Oscillator Input
MII reference clock: Reference clock 25-MHz ±100 ppm-tolerance
crystal or oscillator input. The device supports either an external crystal
resonator connected across pins XI and XO, or an external CMOS-level
oscillator connected to pin XI only.
RMII reference clock: Reference clock 50-MHz ±100 ppm-tolerance
CMOS-level oscillator in RMII Slave mode. Reference clock 25-MHz ±100
ppm-tolerance crystal or oscillator in RMII Master mode.
RGMII reference clock:Reference clock 25-MHz ±100 ppm-tolerance
crystal or oscillator input. The device supports either an external crystal
resonator connected across pins XI and XO, or an external CMOS-level
oscillator connected to pin XI only.
XI
23
I
Crystal Output: Reference Clock output. XO pin is used for crystal only.
This pin should be left floating when a CMOS-level oscillator is connected
to XI.
XO
22
17
O
GPIO AND LED INTERFACE
Mode 1 (Default): LINK Indication, LED indicates the status of the link.
When the link is good, LED is ON. When the link is down, LED is OFF.
Mode 2: ACT Indication, LED indicates transmit and receive activity in
addition to the status of the link. The LED is ON when link is good. The
LED blinks when the transmitter or receiver is active.
LED_0
O, S-PU
Mode 1 (Default): This pin is tri-state.
Mode 2: SPEED Indication, LED indicates the speed of the link. If speed
is 100 Mbps, LED is ON. If speed is 10 Mbps, LED is OFF. External Pull
resistors are required when LED is connected to this pin.
GPIO1: This pin can be used as a GPIO when using register access.
Signal Detect: This pin acts as Signal Detect in 100BASE-FX mode and
shall be connected with Optical Transceiver. Signal Detect high level will
be the VDDIO voltage level.
LED_1 / GPIO1
24
I/O, S-PD
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