ICS1893AFILF datasheet(107/137 Pages) RENESAS

107 / 137 page

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1893AF, Rev. D 10/26/04

October, 2004

107

ICS1893AF Data Sheet - Release

RXD0,

RXD1,

RXD2,

RXD3

31,

30,

29,

Output

Receive Data 0–3.

• RXD0 is the least-significant bit and RXD3 is the most-significant bit of

the MII receive data nibble.

• While the ICS1893AF asserts RXDV, the ICS1893AF transfers the

receive data signals on the RXD0–RXD3 pins to the MAC/Repeater

Interface synchronously on the rising edges of RXCLK.

RXDV

Output

Receive Data Valid.

The ICS1893AF asserts RXDV to indicate to the MAC/repeater that data

is available on the MII Receive Bus (RXD[3:0]). The ICS1893AF:

• Asserts RXDV after it detects and recovers the Start-of-Stream

delimiter, /J/K/. (For the timing reference, see Chapter 10.5.6,

“100M/MII Media Independent Interface: Synchronous Receive

Timing”.)

• De-asserts RXDV after it detects either the End-of-Stream delimiter

(/T/R/) or a signal error.

Note: RXDV is synchronous with the Receive Data Clock, RXCLK.

RXER

Output

Receive Error.

When the MAC/Repeater Interface is in:

• 10M MII mode, RXER is not used.

• 100M MII mode, the ICS1893AF asserts a signal on the RXER pin

when either of the following two conditions are true:

– Errors are detected during the reception of valid frames

– A False Carrier is detected

Note:

1. An ICS1893AF asserts a signal on the RXER pin upon detection of a

False Carrier so that repeater applications can prevent the

propagation of a False Carrier.

2. The RXER signal always transitions synchronously with RXCLK.

3. The signal on RXER pin is conditioned by the RXTRI pin.

TXCLK

Output

Transmit Clock.

The ICS1893AF generates this clock signal to synchronize the transfer of

data from the MAC/Repeater Interface to the ICS1893AF. When the

mode is:

• 10Base-T, the TXCLK frequency is 2.5 MHz.

• 100Base-TX, the TXCLK frequency is 25 MHz.

Table 9-8.

MAC/Repeater Interface Pins: Media Independent Interface (MII) (Continued)

Name

Number

Type

Pin Description

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