PM5356 datasheet(63/307 Pages) PMC

63 / 307 page

RELEASED

S/UNI-622-MAX

PMC-Sierra, Inc.

PM5356

S/UNI-622-MAX

DATASHEET

PMC-1980589

ISSUE 6

SATURN USER NETWORK INTERFACE (622-MAX)

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

HCS patterns are detected. In such an event a transition is made back to the

HUNT state. The state diagram of the delineation process is shown in Figure 5.

Figure 5: Cell Delineation State Diagram

HUNT

PRESYNC

SYNC

correct HCS

(byte by byte)

DELTA

consecutive

correct HCS's

(cell by cell)

Incorrect HCS

(cell by cell)

ALPHA

consecutive

incorrect HCS's

(cell by cell)

The values of ALPHA and DELTA determine the robustness of the delineation

process. ALPHA determines the robustness against false misalignments due to

bit errors. DELTA determines the robustness against false delineation in the

synchronization process. ALPHA is chosen to be 7 and DELTA is chosen to be 6.

These values result in an average time to delineation of 8 µs for the STS-

12c/STM-4-4c rate.

Descrambler

The self-synchronous descrambler operates on the 48 byte cell payload only.

The circuitry descrambles the information field using the x43 + 1 polynomial. The

descrambler is disabled for the duration of the header and HCS fields and may

optionally be disabled for the payload.

Cell Filter and HCS Verification

Cells are filtered (or dropped) based on HCS errors and/or a cell header pattern.

Cell filtering is optional and is enabled through the RXCP registers. Cells are

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