LU3X54FTL Datasheet, PDF (20/52 Pages) Agere Systems – QUAD-FET for 10Base-T/100Base-TX/FX

LU3X54FTL
QUAD-FET for 10Base-T/100Base-TX/FX
Data Sheet
July 2000
Pin Information (continued)
When operating in bused MII mode, 100 Mbits/s data is bused to MII port A, and 10 Mbits/s data is bused to MII
port B.
Table 4. MII/Serial Interface Pins in Bused MII Mode (continued)
Pin
Signal
Type
Description
93
TX_EN10/[D:A]/
92
SECURITY_10/100
90
89
I Transmit Enable—10 Mbits/s Mode. When driven high, this signal indicates
that there is valid data on TXD when the corresponding channel is in
10 Mbits/s serial mode.
Security for 10/100 Mbits/s Smart Mode. When SMART_MODE_SELECT
is enabled, these pins are redefined to be the security input pins for both
10 Mbits/s and 100 Mbits/s. When security is activated, the LU3X54FTL will
ignore the transmit data, and a fixed pattern is transmitted (all 1s for 10Base-T,
alternating 1, 0 for 100TX).
96
TX_EN100[D:A]/
63
TX_EN10/100
146
123
122
TX_ER
76
COL_10[D:A]
75
74
72
Security should not be asserted until after the entire preamble has been trans-
mitted. When in smart mode, the 10 Mbits/s transmit channels will be enabled
through the TX_EN100 inputs.
I Transmit Enable—100 Mbits/s Mode. When SMART_MODE_SELECT is not
enabled and TX_EN100 is driven high, this signal indicates that there is valid
data on TXD_100[3:0] when in 100 Mbits/s mode. If the individual channel is
not configured for 100 Mbits/s mode, this input will be ignored.
Transmit Enable—10/100 Mbits/s Smart Mode. When
SMART_MODE_SELECT is asserted and TX_EN100 is driven high, this sig-
nal indicates that its channel’s input data is valid. The input data is selected by
the speed of the corresponding channel.
I Shared Transmit Coding Error. When asserted high, this signal causes the
encoder to intentionally corrupt the byte being transmitted across the MII
(00100 will be transmitted). This signal is not used in 10 Mbits/s mode.
O Collision Detect for 10 Mbits/s Mode. In half-duplex mode, this signal signi-
fies that a collision has occurred on the network. COL_10 is asserted high
whenever there is transmit and receive activity on the UTP media. COL_10 is
the logical AND of TX_EN and receive activity, and it is an asynchronous out-
put.
100
COL_100[D:A]/
67
COL_10/100[D:A]
150
127
When SERIAL_SEL is high and in 10Base-T mode, this signal indicates that
the jabber timer has expired. When SMART_MODE_SELECT is asserted, the
LU3X54FTL will internally OR together the COL_10 and COL_100 signals and
output them on the COL_100 pins.
O Collision Detect for 100 Mbits/s Mode. In half-duplex mode, this signal signi-
fies that a collision has occurred on the network. COL_100 is asserted high
whenever there is transmit and receive activity on the UTP media. COL_100 is
the logical AND of TX_EN and receive activity, and it is an asynchronous out-
put.
Collision Detect for 10/100 Mbits/s Smart Mode. When SERIAL_SEL is
high and in 10Base-T mode, this signal indicates that the jabber timer has
expired. When SMART_MODE_SELECT is asserted, the LU3X54FTL will
internally OR together the COL_10 and COL_100 signals and output them on
the COL_100 pins.
20
Lucent Technologies Inc.