ICS1893 Integrated Circuit Systems, ICS1893 Datasheet - Page 115

• Manufacturer Part Number: ICS1893
• Description: 3.3-V 10Base-T/100Base-TX Integrated PHYceiver
• Manufacturer: Integrated Circuit Systems

ICS1893 Rev C 6/6/00
Table 9-5.
TXEN
TXER
Name
Pin
ICS1893 - Release
Number
MAC/Repeater Interface Pins: Media Independent Interface (MII) (Continued)
Pin
44
42
Type
Input
Input
Pin
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
Transmit Enable.
In MII mode:
Transmit Error.
When the MAC/Repeater Interface is in:
•
•
•
•
Note: The Invalid Symbol used for this function is the HALT symbol,
The ICS1893 samples its TXEN signal to determine when data is
available for transmission. When TXEN is asserted, the ICS1893
begins sampling the data nibbles on the transmit data lines TXD[3:0]
synchronously with TXCLK. The ICS1893 then transmits this data over
the media.
Following the de-assertion of TXEN, the ICS1893 terminates
transmission of nibbles over the media.
10M MII mode, TXER is not used.
100M MII mode:
– The ICS1893 synchronously samples its TXER signal on the rising
– The assertion of TXER by the MAC/repeater causes the ICS1893 to
– the Invalid Error Code Test bit (bit 16.2) is set to logic one, the 5-bit
edges of its TXCLK signal.
transmit an Invalid Symbol.
symbol shown in the Invalid Error Code Translation Table
8-17) is used instead of the normal 4B/5B encoding described in the
ISO/IEC specification.
which is substituted for the transmit nibble received from the
MAC/repeater whenever the TXER is asserted.
115
Chapter 9 Pin Diagram, Listings, and Descriptions
Pin Description
(Table
June, 2000