EXTERNAL SIGNALS
KS8910 100/10 Mbps ETHERNET TRANSCEIVER
2-6
Preliminary Spec. ver
1.4
Signal
Pin Number
I/O
Description
LEDR[D1]
6
I/O
5T
t/s
Receive Indicator /Device ID1:
LEDS[D0]
7
Speed Indicator /Device ID0:
Pulled low when 100Mbit/s operation is in affect either by manual
selection or after Arbitration. Pulled high when 10Mbit/s operation is in
affect and during Auto-Negotiation.
ANALOG PINS
The next sub-table shows the signals needed to support the analog circuitry in the Transceiver.
XTAL_OUT
11
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
synthesizer uses this crystal reference to produce the 100Mbit/s transmit
clock(125MHz).
XTAL_IN
12
I
TWISTED PAIR INTERFACE
The next sub-table lists the signals used to send and receive 100Mbit/s data on twisted pairs.
TPOP
21
O
TPOP/TPON :
Differential driver outputs to the cable magnetics. The on-chip driver circuit
automatically switches between 10Mbit/s and 100Mbit/s operation.
TPON
23
O
TPIP
32
I
TPIP/TPIN :
Differential receiver inputs from the cable magnetics.
TPIN
31
I
TPOB
19
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.
CONTROL SIGNALS
The next sub-table shows the control signals. These control signals select various modes of operation of the
Transceiver
AN_EN
24
5T
PU
Enables autonegotiation of operation speed.
SP_SEL
29
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.
RESET
33
Master reset for the Transceiver. Resets all digital logic and some analog
circuits.This Reset is an active Low.
PD
36
5T
PD
Power Down Mode
FDPLX
8
Enables full duplex operation.
Table 2-1. KS8910 Signal Descriptions
Содержание KS8910
Страница 1: ...20 8910 0599 USER S MANUAL KS8910 100 10 Mbps Ethernet Transceriver PHY Preliminary ...
Страница 4: ...PRELIMINARY SPECIFICATION vi KS8910 100 10 Mbps ETHERNET CONTROLLER ...
Страница 21: ...EXTERNAL SIGNALS KS8910 100 10 Mbps ETHERNET TRANSCEIVER 2 8 Preliminary Spec ver 1 4 MEMO ...
Страница 47: ...10BASE T DIGITAL BLOCKS KS8910 100 10 Mbps ETHERNET TRANSCEIVER 5 6 Preliminary Spec ver 1 4 MEMO ...
Страница 89: ...APPLICATION NOTE KS8910 100 10 Mbps ETHERNET TRANSCEIVER 9 2 Preliminary Spec ver 1 4 MEMO ...
Страница 91: ...MECHANICAL DATA KS8910 100 10 Mbps ETHERNET TRANSCEIVER 10 2 Preliminary Spec ver 1 4 MEMO ...
Страница 99: ...A 8 APPENDIX KS8910 100 10 Mbps ETHERNET TRANSCEIVER Preliminary Spec ver 1 4 NOTES ...