lxt975 Intel Corporation, lxt975 Datasheet - Page 34

• Manufacturer Part Number: lxt975
• Description: Fast Ethernet 10/100 Quad Transceivers
• Manufacturer: Intel Corporation

LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
2.5.4.2
2.5.4.3
34
Figure 16. 100BASE-TX Reception with No Errors
Figure 17. 100BASE-TX Reception with Invalid Symbol
Figure 18. 100BASE-TX Transmission with No Errors
Figure 19. 100BASE-TX Transmission with Collision
Data Errors
Figure 16
it asserts RX_ER, as shown in
Collision Indication
Figure 18
are active at the same time. As shown in
is asserted and remains asserted for the duration of the collision.
RXD<3:0>
TXD<3:0>
RXD<3:0>
RX_CLK
TX_CLK
RX_CLK
TXD<3:0>
RX_DV
RX_ER
TX_EN
RX_DV
RX_ER
TX_CLK
shows normal reception. When the LXT974/975 receives invalid symbols from the line,
shows normal transmission. The LXT974/975 detects a collision if transmit and receive
TX_EN
CRS
COL
CRS
COL
preamble
preamble
P
P
R
R
SFD SFD
SFD SFD
E
Figure
E
A
A
DA
M
DA
17.
M
B
DA
Figure
DA
B
L
L
DA
DA
E
19, upon detection of a collision, the COL output
E
XX
DA
DA
JAM
XX
CRC
DA DA DA DA
XX
JAM
XX
CRC
XX
JAM
DA
XX
CRC
DA
XX
JAM
DA
XX
CRC
DA
XX
Datasheet