ICS1893 datasheet(112/152 Pages) ICST

112 / 152 page

ICS1893 Rev C 6/6/00

June, 2000

112

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1893 Data Sheet - Release

9.3.4

MAC/Repeater Interface Pins

This section lists pin descriptions for each of the following interfaces

• Section 9.3.4.1, “MAC/Repeater Interface Pins for Media Independent Interface”

• Section 9.3.4.2, “MAC/Repeater Interface Pins for 100M Symbol Interface”

• Section 9.3.4.3, “MAC/Repeater Interface Pins for 10M Serial Interface”

9.3.4.1

MAC/Repeater Interface Pins for Media Independent Interface

Table 9-5 lists the MAC/Repeater Interface pin descriptions for the MII.

Table 9-5.

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

Name

Number

Type

Pin Description

COL

Output

Collision (Detect).

The ICS1893 asserts a signal on the COL pin when the ICS1893 detects

receive activity while transmitting (that is, while the TXEN signal is

asserted by the MAC/repeater, that is, when transmitting). When the

mode is:

• 10Base-T, the ICS1893 detects receive activity by monitoring the

un-squelched MDI receive signal.

• 100Base-TX, the ICS1893 detects receive activity when there are two

non-contiguous zeros in any 10-bit symbol derived from the MDI

receive data stream.

Note:

1. The signal on the COL pin is not synchronous to either RXCLK or

TXCLK.

2. In full-duplex mode, the COL signal is disabled and always remains

low.

3. The COL signal is asserted as part of the signal quality error (SQE)

test. This assertion can be suppressed with the SQE Test Inhibit bit

(bit 18.2).

CRS

Output

Carrier Sense.

When the ICS1893 mode is:

• Half-duplex, the ICS1893 asserts a signal on its CRS pin when it

detects either receive or transmit activity.

• Either full-duplex or Repeater mode, the ICS1893 asserts a signal on

its CRS pin only in response to receive activity.

Note: The signal on the CRS pin is not synchronous to the signal on

either the RXCLK or TXCLK pin.

MDC

Input

Management Data Clock.

The ICS1893 uses the signal on the MDC pin to synchronize the transfer

of management information between the ICS1893 and the Station

Management Entity (STA), using the serial MDIO data line. The MDC

signal is sourced by the STA.

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