PM7347 datasheet(193/341 Pages) PMC

193 / 341 page

S/UNI®-JET Data Sheet

Released

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

193

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

R/W

CCDIS

Bit 6

R/W

HCSPASS

Bit 5

R/W

IDLEPASS

Bit 4

R/W

IN52

Bit 3

R/W

ALIGN[1]

Bit 2

R/W

ALIGN[0]

Bit 1

R/W

HCSFTR[1]

Bit 0

R/W

HCSFTR[0]

HCSFTR[1:0]

The HCS filter bits, HCSFTR[1:0] indicate the number of consecutive error-free cells

required, while in detection mode, before reverting back to correction mode. Refer to Table

20.

Table 20 RXCP-50 HCS Filtering Configurations

HCSFTR[1:0]

Cell Acceptance Threshold

One ATM cell with correct HCS before resumption of cell acceptance. This cell

is accepted.

Two ATM cells with correct HCS before resumption of cell acceptance. The last

cell is accepted.

Four ATM cells with correct HCS before resumption of cell acceptance. The last

cell is accepted.

Eight ATM cells with correct HCS before resumption of cell acceptance. The

last cell is accepted.

ALIGN[1:0]

ALIGN[1:0] configures the RXCP-50 to perform cell delineation based on byte, nibble, or bit

wide search algorithms when ATM Direct Mapping is used. Cell alignment is relative to

overhead bits in the serial input data stream. The ALIGN[1:0] bits are valid only if ATM

direct mapping is used. PLCP framing must be disabled. The Recommended settings for DS3,

E3, and J2 are shown in Table 21.

Table 21 RXCP-50 Cell Delineation Algorithm Base

ALIGN[1:0]

Cell Delineation Algorithm base

Bit

Nibble (DS3)

Byte (E3,J2, E1, T1)

Unused

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