ICS1892 Integrated Circuit Systems, ICS1892 Datasheet - Page 112
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ICS1892
Manufacturer Part Number
ICS1892
Description
10Base-T/100Base-TX Integrated PHYceiver
Manufacturer
Integrated Circuit Systems
Datasheet
1.ICS1892.pdf
(148 pages)
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ICS1892, Rev. D, 2/26/01
Table 9-6. MAC/Repeater Interface Pins: Media Independent Interface (MII) (Continued)
TXEN
TXER
Name
Pin
ICS1892 Data Sheet
Number
Pin
44
42
Type
Input
Input
Pin
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
Transmit Enable.
The signal on this pin indicates to the ICS1892 that the MAC/repeater is
sending valid data nibbles for transmission on the physical media.
Transmit Error.
When the mode is:
•
•
•
•
Synchronous with the assertion of TXEN, the ICS1892 begins reading
the data nibbles on the transmit data lines and transmitting them over
the media.
Following the de-assertion of TXEN, the ICS1892 terminates
transmission of nibbles.
10Base-T, TXER is not required.
100Base-TX mode:
– The assertion of TXER by the MAC/repeater causes the ICS1892 to
– The Invalid Symbol used for this function is the HALT symbol, which
– When the Invalid Error Code Test bit (bit 16.2) is set to logic one, the
transmit Invalid Symbols. (The ICS1892 synchronously samples the
TXER signal on the rising edges of TXCLK.)
is substituted for the transmit nibble received from the
MAC/repeater.
5-bit symbol shown in the Invalid Error Code Translation Table
(Table
in the ISO/IEC specification.
8-17) is used instead of the normal 4B/5B encoding described
112
Chapter 9 Pin Diagram, Listings, and Descriptions
Pin Description
February 26, 2001
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