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EXTERNAL SIGNALS
Signal
Pin Number
LEDR[D1]
6
LEDS[D0]
7
ANALOG PINS
The next sub-table shows the signals needed to support the analog circuitry in the Transceiver.
XTAL_OUT
11
XTAL_IN
12
TWISTED PAIR INTERFACE
The next sub-table lists the signals used to send and receive 100Mbit/s data on twisted pairs.
TPOP
21
TPON
23
TPIP
32
TPIN
31
TPOB
19
CONTROL SIGNALS
The next sub-table shows the control signals. These control signals select various modes of operation of the
Transceiver
24
AN_EN
29
SP_SEL
33
RESET
PD
36
FDPLX
8
2-6
Table 2-1. KS8910 Signal Descriptions
I/O
Receive Indicator /Device ID1:
I/O
Speed Indicator /Device ID0:
5T
Pulled low when 100Mbit/s operation is in affect either by manual
t/s
selection or after Arbitration. Pulled high when 10Mbit/s operation is in
affect and during Auto-Negotiation.
O
Oscillator Input/Output :
A ±50 ppm 25 MHz oscillator is connected between these two pins. This
oscillator is used to time the 10Mbit/s transmitter and as a reference for the
clock recovery of both the 10Mbit/s and 100Mbit/s serial data. A frequency
I
synthesizer uses this crystal reference to produce the 100Mbit/s transmit
clock(125MHz).
O
TPOP/TPON :
Differential driver outputs to the cable magnetics. The on-chip driver circuit
O
automatically switches between 10Mbit/s and 100Mbit/s operation.
I
TPIP/TPIN :
Differential receiver inputs from the cable magnetics.
I
O
Provides a bias for the transmit transformer center tap. This bias is about
2.6 volts and should be connected with the Capacitor on GND.
5T
Enables autonegotiation of operation speed.
PU
100/10 Mbit/s is sampled at the negation of the RESET signal. A high level
on this input selects 100Mbit/s operation. A low level selects 10Mbit/s.
When undriven, this input will float high setting the default operation to
100Mbit/s.
Master reset for the Transceiver. Resets all digital logic and some analog
circuits.This Reset is an active Low.
5T
Power Down Mode
PD
Enables full duplex operation.
KS8910 100/10 Mbps ETHERNET TRANSCEIVER
Description
Preliminary Spec. ver
1.4
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