ICS1893CF datasheet(90/127 Pages) IDT

90 / 127 page

ICS1893CF, Rev. J, 08/11/09

August, 2009

Chapter 8 Pin Diagram, Listings, and Descriptions

ICS1893CF Data Sheet - Release

8.2.4 MAC Interface Pins

This section lists pin descriptions for each of the following interfaces

• Section 8.2.4.1, “MAC Interface Pins for Media Independent Interface”

8.2.4.1 MAC Interface Pins for Media Independent Interface

Table 8-7 lists the MAC Interface pin descriptions for the MII.

Table 8-7. MAC Interface Pins: Media Independent Interface (MII)

Name

Number

Type

Pin Description

COL

Output

Collision (Detect).

The ICS1893CF asserts a signal on the COL pin when the ICS1893CF

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

asserted by the MAC, that is, when transmitting). When the mode is:

• 10Base-T, the ICS1893CF detects receive activity by monitoring the

un-squelched MDI receive signal.

• 100Base-TX, the ICS1893CF 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 ICS1893CF mode is:

• Half-duplex, the ICS1893CF asserts a signal on its CRS pin when it

detects either receive or transmit activity.

• Either full-duplex or Repeater mode, the ICS1893CF 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 ICS1893CF uses the signal on the MDC pin to synchronize the

transfer of management information between the ICS1893CF and the

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

MDC signal is sourced by the STA.

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