PM8621 datasheet(154/184 Pages) PMC

154 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

153

Document ID: PMC-2010850, Issue 1

tst_report("Executing Receive buffer resync"&"

following short message of length " &

to_str(dword_rd_cnt) & ".");

wr(RX_STTS, "00000000000000000000000000000001");

Poll the bit here before startiong next message.

rd(RX_STTS);

WHILE rx_fi_busy = '1' LOOP

rd(RX_STTS);

END LOOP;

END IF;

END LOOP;

---

Simulation Stuff

Check_Rx_Msg(Payload_Chk,No_Header_Chk); -- Check payload only.

rx_msg_cnt_o <= rx_msg_cnt_o + 1;

---

End Simulation Stuff

msgs_rd := msgs_rd + 1;

ELSE

msgs_rd = msg_lvl_loop

When we think we're done check that we really are.

Update the current value of RX_MSG_LVL. Allows for the case where a

message has arrived while processing.

At this point we have read all the messages we thought we had at the

start of the loop so whatever number is returned now is the number of

new messages receieved while we've been reading messages.

Unless we're running real slow this should only be 1 or 0.

We adjust our loop variable by this amount to keep the loop going

long enough to get the extra messages received.

rd(RX_STTS);

WHILE rx_stts_valid = '0' OR rx_fi_busy = '1' LOOP

rd(RX_STTS);

END LOOP;

IF rx_msg_lvl > 0 THEN

tst_report("Message(s) Received while processing messages");

END IF;

Note in this code I'm not checking for more messages received than

read. We'd be in real trouble in the system in this case! We

also can't get there in the sim!

msgs_rd := msgs_rd - rx_msg_lvl;

END IF;

END LOOP;

END Message_Receive;

12.12.3 Handling the Transmit Header

PAGE Bits

If the IPAGE bits are changed, they are not sent in the header bits until the next frame. They will

be continually sent for each message in subsequent frames until they change again.

USER, LINK and AUX Bits

When any of these bits change they are sent in the header bits of the next message. They will be

continually sent for each subsequent message until they change again.

PM8621 Datasheet(PDF) 154 Page - PMC-Sierra, Inc

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