PM8621 PMC-Sierra, Inc., PM8621 Datasheet - Page 53

• Manufacturer Part Number: PM8621
• Description: NSE-8G Standard Product Data Sheet Preliminary
• Manufacturer: PMC-Sierra, Inc.

9.9.1
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010850, Issue 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
Figure 12 In-Band Signaling Channel Header Format
Table 5 In-band Message Header Fields
Header1
Bit 7
VALID
Header2
Bit 7
AUX[7:0]
Field Name
Valid
Link[1:0]#
1 byte
Header1
Bit 6
LINK[1:0]
Bit 6
1 byte
Header2
NSE-8G to SBS
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)
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.
Bit 5
Bit 5
32 bytes
Free Format Information
Bit4
PAGE[1:0]
Bit4
Bit3
Bit3
NSE-8G™ Standard Product Data Sheet
SBS to NSE
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)
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.
Bit2
USER[2:0]
Bit2
Bit1
Bit1
2 bytes
CRC-16
Bit 0
Bit 0
Preliminary
52