PM8621 datasheet(153/184 Pages) PMC

153 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

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

152

Document ID: PMC-2010850, Issue 1

Poll the bit here before startiong next message.

rd(RX_STTS);

WHILE rx_fi_busy = '1' LOOP

rd(RX_STTS);

END LOOP;

Check the CRC_ERR bit for the next message

rd(RX_STTS);

rxmsg.crc_err := crc_err_reg;

END LOOP;

Now we should have a good message or an errored message we want to read

Note: we might have skipped the last message in

the code above.

Read the message IF we have any.

IF msgs_rd < msg_lvl_loop THEN

msg_done

:= false;

dword_rd_cnt

:= 0;

rxmsg.payload := (OTHERS => 0);

WHILE dword_rd_cnt < 8 AND NOT msg_done LOOP

rd(RX_DAT);

-- The returned data is part of the payload

---

Simulation Stuff. Should replace with S/W stuff

FOR j IN 3 DOWNTO 0 LOOP

rxmsg.payload((dword_rd_cnt*4)+(3-j)) :=

conv_integer(reg_rd_data(8*j+7 DOWNTO 8*j));

END LOOP;

IF dword_rd_cnt = 0 THEN

rndm_rx_payload_len <= conv_integer(reg_rd_data(31 DOWNTO 24));

END IF;

---

End Simulation Stuff.

dword_rd_cnt := dword_rd_cnt + 1;

IF polled_rx_mode THEN

rd(RX_STTS);

WHILE rx_fi_busy = '1' LOOP

rd(RX_STTS);

END LOOP;

ELSE

-- Fixed delay to allow to ensure 4 SYSCLKs plus o/p delay between RDB edges

WAIT FOR 36 ns;

END IF;

Optional S/W algorithm to determine if the MSG is DONE before 8 Dwords

have been read. In this case for SIMULATION the test the msg_done is set

when we've read the number of dwords as indicated in the 1st message

payload byte.

IF dword_rd_cnt = rndm_rx_payload_len THEN

msg_done := true;

END IF;

IF msg_done AND dword_rd_cnt < 8 THEN

-- We're on a short message. Need to do RX_XFER_SYNC

PM8621 Datasheet(PDF) 153 Page - PMC-Sierra, Inc

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