Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

PCS Tx Diagram (Clause 48)

Couple of remarks about the transmit state machine in D1.1:

Figure 48-7: Tx Source State Machine

1.Sending /A/ or /K/ as the first column in the IDLE pattern should be done
with probability ~0.5 for each. So, it seems enough to choose each of them
based on the value of code_sel (code_sel=1: Send A, code_sel=0: Send /K/).
Thus, I think that the qualification by A_CNT_0 should be eliminated.

2.The path from the "SEND_K" box to the "SEND_DATA" box means that there
might be an IDLE pattern which is composed from a single /K/ column? I think
that this branch should not appear. The "B" point should always be the next
one, because it is associated with the first /R/ column that must exist in
the IDLE pattern

Figure 48-8 PCS transmit idle and Signal state diagram

1.A general remark: When a SIGNAL event occurs, the machine which is
generating code_sel and A_CNT_0 are freeze? I'm asking that because if it
not so, then it may happen that the A_CNT_0=1 event occurs exactly when
TX=SIGNAL occurs. If this happens, then the /A/ column is not transmitted:
Instead, the Encode(SIGNAL) is transmitted.

2.Whats the motivation behind SIGNAL event: Is this the RF? If so, it is not
coordinated with your presentation in Tampa, where you show the RF comes
always after the /A/ column

Figure 48-9: Transmit Sequence

1.If I understand whats written there-You send a sequence until A_CNT_0=1,
then you send /A/, then you send pseudo random /K/ /R/ pattern until
A_CNT_0=1 again, and then you transmit the sequence again. What is the