PM8621 datasheet(120/184 Pages) PMC

120 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

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

119

Document ID: PMC-2010850, Issue 1

RX_MSG_LVL[3:0]

This indicates the current number of messages in the Receive FIFO.

Table 8 RX FIFO Message Level

RX_MSG_LVL[3:0]

Number of messages

0000

1000

Values greater than 1000 will not occur.

HDR_CRC_ERR

If this bit is set to ‘1’, the last message slot received was received with an errored CRC-16

field. This bits is updated every message slot. This bit is provided as status only.

CRC_ERR

If this bit it set to ‘1’, the message at the head of the Receive FIFO has an errored CRC-16

field.

The usual sequence would be to read this register before reading the message buffer to check

if the message buffer that will be read from next has been received with a CRC error. If a

Receive FIFO Synchronization has been started the value of this bit is invalid until the

RX_XFER_SYNC operation has completed. When FAST_RD_EN is a ‘1’ this bit is valid

when RX_FI_BUSY is a ‘0’ following a Receive FIFO Synchronization. When

FAST_RD_EN is a ‘0’ the values of RX_FI_BUSY and CRC_ERR change concurrently and

a further read should be made after RX_FI_BUSY is sampled as a ‘0’ before checking the

value of this bit.

OUSER[2:0]

These bits are a reflection of the OUSER[2:0] bits output from the far end and indicate the

value of the received USER bits in the received message header of the last message received

(without a CRC-16 error). These bits are available in the three top level SBS User bits

registers at a bit position equal to the link number.

OPAGE[1:0]

These bits are a reflection of the OPAGE[1:0] bits output from the far end and indicate the

value of the received PAGE bits in the received message header of the last message received

(without a CRC-16 error). These bits are available in the two top level SBS page bits registers

at a bit position equal to the link number.

PM8621 Datasheet(PDF) 120 Page - PMC-Sierra, Inc