S2009
1.6 GBPS QUAD SERIAL BACKPLANE DEVICE
TCLKD is used to reset the Channel Lock state machine
and initialize the FIFOs in the receive data path. Assertion
of TCLKD Low does not interrupt the transmit data path.
status lines will reflect the status of the individual channels
and the device will respond to appropriate channel locking
sequences and deskew as necessary. Persistence of 1-
0-1 status on any channel or a logic 1 on LOLx is indica-
tive of CRU lock failure, most likely resulting from loss of
receiver input signal. The device will then respond to the
channel locking sequence.
When not in Channel Lock Mode, the linkage between
the four state machines is broken and each channel oper-
ates independently.
Loss of Channel Lock will be reported as indicated in
Table 7 by a 1-0-1 on the ERR, EOF, and KFLAG sig-
nals, respectively. This is during the “No Sync” state. The
When operating in the Channel Lock Mode, the TCLKB
input must be tied Low.
Figure 7. Channel Lock State Machine
TCLKD = Low for at least 16 clocks
or CRU Loss of Lock or five sequential
decoding errors or decoding error rate >50% (block 16)
All four channels in Re-sync with
valid data within deskew window
IN SYNC
Errored codeword or CRU Loss of Lock or five sequential
decoding errors or decoding error rate >50% (block 16) or
RESET_N
valid data not within deskew window
or TCLKD = Low for at least 16 clocks
RE-SYNC
NO SYNC
Errored codeword or <4 K28.5 or CRU Loss of Lock
or five sequential decoding errors or decoding error
≥4 K28.5 Detected
rate >50% (block 16) or TCLKD = Low for at least 16 clocks
One K28.5 Detected
ACQUIRING SYNC
Note: Errored codeword means “Codeword violation” or “Parity error.”
12
February 9, 2001 / Revision C
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
