ICS1893Y-10 Datasheet, PDF (114/150 Pages) –

ICS1893Y-10 Data Sheet - Release
Chapter 8 Pin Diagram, Listings, and Descriptions
Table 8-5. MAC/Repeater Interface Pins: Media Independent Interface (MII) (Continued)
Pin
Name
TXEN
Pin
Number
44
Pin
Type
Input
Pin Description
Transmit Enable.
In MII mode:
• The ICS1893Y-10 samples its TXEN signal to determine when data is
available for transmission. When TXEN is asserted, the ICS1893Y-10
begins sampling the data nibbles on the transmit data lines TXD[3:0]
synchronously with TXCLK. The ICS1893Y-10 then transmits this data
over the media.
• Following the de-assertion of TXEN, the ICS1893Y-10 terminates
transmission of nibbles over the media.
TXER
42
Input Transmit Error.
When the MAC/Repeater Interface is in:
• 10M MII mode, TXER is not used.
• 100M MII mode:
– The ICS1893Y-10 synchronously samples its TXER signal on the
rising edges of its TXCLK signal.
– The assertion of TXER by the MAC/repeater causes the
ICS1893Y-10 to transmit an Invalid Symbol.
– the Invalid Error Code Test bit (bit 16.2) is set to logic one, the 5-bit
symbol shown in the Invalid Error Code Translation Table (Table
7-17) is used instead of the normal 4B/5B encoding described in the
ISO/IEC specification.
Note: The Invalid Symbol used for this function is the HALT symbol,
which is substituted for the transmit nibble received from the
MAC/repeater whenever the TXER is asserted.
ICS1893Y-10 Rev F 1/20/04
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
114
January, 2004