ICS1893BY-10 - Release
Chapter 8 Pin Diagram, Listings, and Descriptions
8.3.4.1 MAC/Repeater Interface Pins for Media Independent Interface
Table 8-5 lists the MAC/Repeater Interface pin descriptions for the MII.
Table 8-5. MAC/Repeater Interface Pins: Media Independent Interface (MII)
Pin
Pin
Pin
Pin Description
Name Number
Type
COL 49
Output Collision (Detect).
The ICS1893BY-10 asserts a signal on the COL pin when the
ICS1893BY-10 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 ICS1893BY-10 detects receive activity by monitoring
the un-squelched MDI receive signal.
• 100Base-TX, the ICS1893BY-10 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
50
Output Carrier Sense.
When the ICS1893BY-10 mode is:
• Half-duplex, the ICS1893BY-10 asserts a signal on its CRS pin when it
detects either receive or transmit activity.
• Either full-duplex or Repeater mode, the ICS1893BY-10 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
31
30
Input
Management Data Clock.
The ICS1893BY-10 uses the signal on the MDC pin to synchronize the
transfer of management information between the ICS1893BY-10 and the
Station Management Entity (STA), using the serial MDIO data line. The
MDC signal is sourced by the STA.
MDIO
Input/ Management Data Input/Output.
Output The signal on this pin can be tri-stated and can be driven by one of the
following:
• A Station Management Entity (STA), to transfer command and data
information to the registers of the ICS1893BY-10.
• The ICS1893BY-10, to transfer status information.
All transfers and sampling are synchronous with the signal on the MDC
pin.
Note: If the ICS1893BY-10 is to be used in an application that uses the
mechanical MII specification, MDIO must have a 1.5 kΩ 5%
pull-up resistor at the ICS1893BY-10 end and a 2 kΩ 5%
pull-down resistor at the station management end. (These resistors
enable the station management to determine if the connection is
intact.)
ICS1893BY-10 Rev A 3/24/04
March, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
107
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
