PM8621 datasheet(53/184 Pages) PMC

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NSE-8G™ Standard Product Data Sheet

Preliminary

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

Document ID: PMC-2010850, Issue 1

9.9.1

In-Band Signaling Channel Fixed Overhead

The In-Band Link Controller block generates and terminates two bytes of fixed header and a

CRC-16 per every 32 byte in-band message (total 36 bytes). The two byte header provides control

and status between devices at the ends of the LVDS link. The CRC-16 is calculated over the 32

byte (and header - 34 bytes) in-band message and provides the terminating end the ability to

detect errors in the in-band message. The format of the in-band message and header bytes is

shown in Figure 11 and Figure 12.

Figure 11 In-Band Signaling Channel Message Format

1 byte

32 bytes

2 bytes

Header1

Header2

Free Format Information

CRC-16

Figure 12 In-Band Signaling Channel Header Format

Header1

Bit 7

Bit 6

Bit 5

Bit4

Bit3

Bit2

Bit1

Bit 0

VALID

LINK[1:0]

PAGE[1:0]

USER[2:0]

Header2

Bit 7

Bit 6

Bit 5

Bit4

Bit3

Bit2

Bit1

Bit 0

AUX[7:0]

Table 5 In-band Message Header Fields

Field Name

NSE-8G to SBS

SBS to NSE

Valid

Message slot contains a message(1)

or is empty(0). If empty this message

will not be put into Rx Message FIFO

(other header information processed

as usual)

Message slot contains a message(1)

or is empty(0). If empty this message

will not be put into Rx Message FIFO

(other header information processed

as usual)

Link[1:0]#

These bits are optional for SBI336S

devices, intended for devices which

have multiple redundant links. Each

bit either indicates which Link to use,

Working(0) or Protect(1) when

sourced from the master device, or

which link is being used, when

sourced from the slave device. Other

algorithms are possible to indicate

Working or Protect over these 2 bits

but all SBI336S devices must be able

to revert back to this meaning.

Transmitted immediately.

These bits are optional for SBI336S

devices, intended for devices which

have multiple redundant links. Each

bit either indicates which Link to use,

Working(0) or Protect(1) when

sourced from the master device, or

which link is being used, when

sourced from the slave device. Other

algorithms are possible to indicate

Working or Protect over these 2 bits

but all SBI336S devices must be able

to revert back to this

meaning.Transmitted immediately.

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