CDB8952 Просмотр технического описания (PDF) - Cirrus Logic
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CDB8952 Datasheet PDF : 86 Pages
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CS8952T
CrystalLAN™ 100BASE-X and 10BASE-T Transceiver
PWRDN - Power Down. Input, Pin 64.
When this pin is asserted high, the CS8952T powers down all circuitry except that circuitry
needed to maintain the network line impedance. This is the lowest power mode possible. The
CS8952T will remain in low power mode until the PWRDN pin is deasserted.
A slightly higher power power-down mode may also be entered under software control through
bit 11 of the Basic Mode Control Register (address 00h).
REPEATER - REPEATER Mode Select. Input, Pin 16.
This pin controls the operation of the CRS (Carrier Sense) pin as shown below:
REPEATER pin
high
low
low
DUPLEX mode
don’t care
full duplex
half duplex
CRS Indicates
receive activity only
receive activity only
receive or transmit activity
At power-up or at reset, the value on this pin is latched into bit 12 of the PCS Sub-Layer
Configuration Register (address 17h). This pin includes a weak internal pull-down (> 20 KΩ),
or the value may be set by an external 4.7 KΩ pull-up or pull-down resistor.
SPD10 - 10 Mb/s Speed Indication. Output, Pin 68.
This pin is asserted high when the CS8952T is configured for 10 Mb/s operation. This pin can
be used to drive a low-current LED to indicate 10 Mb/s operation.
SPD100 - 100 Mb/s Speed Indication. Output, Pin 67.
This pin is asserted high when the CS8952T is configured for 100 Mb/s operation. This pin can
be used to drive a low-current LED to indicate 100 Mb/s operation.
TCM - Transmit Clock Mode Initialization. Input, Pin 59.
The logic value on this three-level pin during power-up or reset determines whether TX_CLK
is used as an input or an output, and whether an external 25 MHz clock reference is provided
on the CLK25 output pin.
TCM pin
high
floating
low
TX_CLK mode
TX_CLK is input
TX_CLK is input
TX_CLK is output
CLK25 status
CLK25 pin is an output
CLK25 is disabled
CLK25 is disabled
TEST[1:0] - Factory Test. Input, Pins 24 and 25.
These pins are for factory test only. They include weak internal pull-downs (> 20 KΩ), and
should be tied directly to VSS for normal operation.
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
14
DS206TPP2
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