ICS1892 Datasheet, PDF (109/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892
Chapter 9 Pin Diagram, Listings, and Descriptions
9.2.4 MAC/Repeater Interface Pins
This section lists pin descriptions for each of the following interfaces
• Section 9.2.4.1, “MAC/Repeater Interface Pins for Media Independent Interface”
• Section 9.2.4.2, “MAC/Repeater Interface Pins for 100M Symbol Interface”
• Section 9.2.4.3, “MAC/Repeater Interface Pins for 10M Serial Interface”
• Section 9.2.4.4, “MAC/Repeater Interface Pins for Link Pulse Interface”
9.2.4.1 MAC/Repeater Interface Pins for Media Independent Interface
Table 9-6 lists the MAC/Repeater Interface pin descriptions for the MII.
Table 9-6. MAC/Repeater Interface Pins: Media Independent Interface (MII)
Pin
Name
COL
CRS
MDC
Pin
Number
49
50
31
Pin
Type
Output
Output
Input
Pin Description
Collision (Detect).
The ICS1892 asserts a signal on the COL pin when the ICS1892 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 ICS1892 detects receive activity by monitoring the
un-squelched MDI receive signal.
• 100Base-TX, the ICS1892 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).
Carrier Sense.
• In half-duplex mode, the ICS1892 asserts a signal on the CRS pin
when the ICS1892 detects either receive or transmit activity.
• In full-duplex mode and Repeater mode, the ICS1892 asserts a signal
on the CRS pin only when the ICS1892 detects receive activity.
Note: The signal on the CRS pin is not synchronous to either RXCLK or
TXCLK.
Management Data Clock.
The ICS1892 uses the signal on the MDC pin to synchronize the transfer
of management information between the ICS1892 and the Station
Management Entity (STA), using the serial MDIO data line. The MDC
signal is sourced by the STA.
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
109
February 26, 2001