MC68160 Просмотр технического описания (PDF) - Integrated Device Technology

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производитель

MC68160

Enhanced Ethernet Transceiver

Integrated Device Technology 

MC68160A

Enhanced Ethernet Transceiver

NETCOM

MC68160A

Table 1. Pin Function Descriptiont

Pin(s)

Symbol

Type

Name/Function

CONTROLLER INTERFACE

1

RENA

O

TTL/CMO

2

RX

O

TTL/CMOS

48

TCLK

O

TTL/CMOS

49

TENA

I

TTL

50

RCLK

O

TTL/CMOS

51

CLSN

O

TTL/CMOS

52

TX

I

TTL

Receive Enable Output: Indication of the presence of network activity, synchronous to

RCLK. In the standby mode, RENA is driven to the high impedance state.

Receive Data Output: Recovered data, synchronous to RCLK. Following a reset operation,

100 ms should be allowed before attempting to read data processed by the MC68160A, B

and C. This delay is needed to insure that the receive phase locked loop is properly

synchronized with incoming data. In the standby mode, RX is driven to the high impedance

state.

Transmit Clock Output CMOS/TTL Output: TCLK provides a symmetrical clock signal at

10 MHz for reference timing of data to be encoded. In the standby mode, TCLK is driven to

the high impedance state.

Transmit Enable Input: Input signal synchronous to TCLK which enables data transmission

on the active port. An internal pull - down resistor is provided so that the input is low under no

connect conditions. (This resistor is removed in the standby mode). If TENA is asserted at

the conclusion of a reset operation, it must first be deasserted and then reasserted before

data transmission can occur. In the standby mode, TENA is driven to the high impedance

state.

Receive Clock Output: Recovered clock. In the standby mode, RCLK is driven to the high

impedance state.

Collision Output: In the AUI mode, indicates the presence of signals at the ACX+ and

ACX - terminals which meet threshold and pulse width requirements. In the TP mode,

indicates simultaneous transmit and receive activity, a heartbeat (SQE Test) signal was

generated, or the jabber timer has expired. In the standby mode, CLSN is driven to the high

impedance state.

Transmit Data Input: Input signal synchronous to TCLK which provides NRZ serial data to

be Manchester encoded. In the standby mode, TX is driven to the high impedance state.

AUI INTERFACE

21

ACX -

22

ACX+

23

ARX -

24

ARX+

25

ATX -

26

ATX+

I

AUI Differential Collision Inputs: These inputs are connected to a pair of internally biased

line receivers consisting of a carrier detect receiver with offset threshold and noise filtering to

detect the line activity. Signals at ACX+/ - have no effect on data path functions.

I

AUI Differential Receiver Inputs: These inputs are connected to a pair of internally biased

line receivers consisting of a carrier detect receiver with offset threshold and noise filtering to

detect the line activity, and a data receiver with no offset for Manchester Data reception.

O

AUI Differential Transmit Outputs : This line pair is intended to operate into terminated

transmission lines. For TX signals meeting setup and hold time to TCLK when TENA is

previously asserted, Manchester encoded data is outputted at ATX+/-. When operating into a

78 Ω terminated transmission line, signaling meets the required output levels and skew for

IEEE - 802.3 drop cables. When the 10BASE - T port is automatically or manually selected,

the AUI outputs are driven to a low power standby state in which the outputs deliver a

balanced high state voltage.

TWISTED PAIR INTERFACE

31

TPRX -

32

TPRX+

I

Twisted Pair Differential Receiver Inputs: These inputs are connected to a receiver with

Smart Squelch capability which only allows differential receive data to pass as long as the

input amplitude is greater than a minimum signal threshold level and a specific pulse

sequence is received. This assures a good signal to noise ratio while the signal pair is active

by preventing crosstalk and impulse noise conditions from activating the receive function.

36

TPTX -

O

Twisted Pair Differential Transmitter Outputs: These lines have pre - distortion drive

37

TPTX+

capability and are intended to drive terminated twisted pair transmission lines. When the AUI

port is manually selected, the 10BASE - T outputs are driven to a low power standby state in

which the outputs deliver a balanced high state voltage. However, when the AUI port is

automatically selected, the 10BASE - T outputs remain active.

NOTE: The sense of the controller interface pins will change, depending on the controller selected.

IDT™ Enhanced Ethernet Transceiver

MC68160A

Freescale T4iming Solutions Organization has been acquired by Integrated Device TechnologyM, IOncTOROLA ANALOG IC DEVICE DATA

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