PM8621 datasheet(47/184 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

REI are encoded in the V5 byte.

K30.7-

011110 1000

IV5=’b1,

IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] =

REI = ‘b0

Low order path frame alignment. ERDI and

REI are encoded in the V5 byte.

K30.7+

100001 0111

IV5=’b1,

IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] =

REI = ‘b1

Low order path frame alignment. ERDI and

REI are encoded in the V5 byte.

K23.7-

111010 1000

000101 0111

ITPL=’b0

Non low-order path payload bytes.

9.3.3

Serial SBI336S and TelecomBus Alignment

The alignment functionality preformed by each receiver can be broken down into two parts,

character alignment and frame alignment. Character alignment finds the 8B/10B character

boundary in the arbitrarily aligned incoming data. Frame alignment finds SBI336S or

TelecomBus frame and multiframe boundaries within the Serial link.

The character and frame alignment are expected to be robust enough for operation over a cabled

interconnect.

9.3.4

Character Alignment Block

Character alignment locates character boundaries in the incoming 8B/10B data stream. The

character alignment algorithm may be in one of two states, in-character-alignment state and out-

of-character-alignment state. The two states of the character alignment algorithm is shown in

Figure 8.

When the character alignment state machine is in the out-of-character-alignment state, it

maintains the current alignment, while searching for a C1FP character. If it finds the C1FP

character, it will re-align to the C1FP character and move to the in-character-alignment state. The

C1FP character is found by searching for the 8B/10B C1FP character, K28.5+ or K28.5-,

simultaneously in ten possible bit locations. While in the in-character-alignment state, the state

machine monitors LCVs. If 5 or more LCVs are detected within a 15 character window the

character alignment state machine transitions to out-of-character-alignment state. The special

characters listed in Table 2 and Table 3 are ignored for LCV purposes. Upon return to in-

character-alignment state the LCV count is cleared.

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