LXT972 Level One, LXT972 Datasheet - Page 23

• Manufacturer Part Number: LXT972
• Description: 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
• Manufacturer: Level One

As shown in
transmission with a preamble pattern. As soon as the
LXT972 detects the start of preamble, it transmits a Start-
of-Stream Delimiter (SSD, symbols J and K)
network. It then encodes and transmits the rest of the
packet, including the balance of the preamble, the SFD,
packet data, and CRC.
Figure 14: 100BASE-TX Reception with no Errors
Figure 15: 100BASE-TX Reception with Invalid Symbol
R X D < 3 : 0 >
R X D < 3 : 0 >
R X _ C L K
R X _ D V
R X _ E R
R X _ C L K
R X _ D V
R X _ E R
Figure 12 on page
p r e a m b l e S F D S F D
preamble S F D S F D
21, the MAC starts each
D A
D A
D A
to the
D A
D A
X X
D A
Once the packet ends, the LXT972 transmits the End-of
Stream-Delimiter (ESD, symbols T and R) and then returns
to transmitting Idle symbols. 4B/5B coding is shown in
Table 10 on page
Figure 14
LXT972 receives invalid symbols from the line, it asserts
RX_ER as shown in
X X
C R C
X X
shows normal reception with no errors. When the
X X
C R C
X X
LXT972 Functional Description
26.
Figure
X X
C R C
X X
15.
X X
C R C
X X
X X
23