TLK1501_12 Datasheet, PDF (12/32 Pages) Texas Instruments – 0.6 TO 1.5 GBPS TRANSCEIVER

TLK1501
0.6 TO 1.5 GBPS TRANSCEIVER
SLLS428F − JUNE 2000 − REVISED JANUARY 2004
synchronization and initialization (continued)
Invalid Code
Word Received
Power-Up/Reset
3 Invalid Code
Words Received
ACQ
(Link Acquisition)
3 Consecutive Valid IDLEs or Carrier Extends,
or
1 Valid Data or Error Propagation
Loss of Link
Link Established
Valid Code
Word Received
CHECK
(Look for Valid Code)
1 Invalid Code
Word Received
Link in Question
SYNC
(Normal Operation)
Link Re-established
4 Consecutive Valid Code Words Received
Figure 6. Initialization and Synchronization State Diagram
If during normal transmission and reception, an invalid code is received, the TLK1501 notifies the attached
system or protocol device as described in comma detect and 8-bit/10-bit decoding. The synchronization state
machine transitions to the CHECK state. The CHECK state determines whether the invalid code received was
caused by a spurious event or a loss of the link. If, in the CHECK state, the decoder sees four consecutive valid
codes, the state machine determines the link is good and transitions back to the SYNC state for normal
operation. If, in the CHECK state, the decoder sees three invalid codes (not required to be consecutive), the
TLK1501 determines a loss of the link has occurred and transitions the synchronization-state machine back to
the link-acquisition state (ACQ).
The state of the transmit data bus, control terminals, and serial outputs during the link acquisition process is
illustrated in Figure 7.
ACQ
SYNC
TX_EN ^{xx xx xx xx xx xx xx}
TX_ER xx xx xx xx xx xx xx
TXD[0−15] xx xx xx xx xx xx xx xx
D0−D15
DOUTTXP,
DOUTTXN
IDLE
D0−D15
Ca. Ext.
Figure 7. Transmit Side Timing Diagram
Error
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