PM7344 datasheet(74/293 Pages) PMC

74 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

Figure 16

- HCS Verification State Diagram

Detection

ATM DELINEATION

SYNC

STATE

Correction

No HCS Errors Detected in M

Consecutive Cells

(M'th Cell Accepted)

HCS Multi-bit Error Detected

(Cell discarded)

Cell

Discarded

Cell

Accepted

ALPHA

consecutive

incorrect HCS's

(To HUNT state)

DELTA

consecutive

correct HCS's

(From PRESYNC

state)

HCS Single-bit

Error Detected

(Error corrected

& cell accepted)

The RXCP accumulates the number of received assigned cells, received

unassigned/idle cells, cells containing a correctable HCS error and cells

containing an uncorrectable HCS error, in saturating counters.

9.17

Receive ATM 4 Cell FIFO (RXFF)

The Receive FIFO (RXFF) provides FIFO management and the S/UNI-MPH

receive cell interface. The receive FIFO can hold four cells (note that the

effective working FIFO depth is actually three cells because if four complete cells

are being held in the FIFO, the next information bit transmitted to the RXCP,

even if it is part of a null cell, will cause a FIFO overflow). The FIFO provides the

cell rate decoupling function between the transmission system physical layer and

the ATM layer.

In general, the management functions include filling the receive FIFO, indicating

when the receive FIFO contains cells, maintaining the receive FIFO read and

write pointers, and detecting FIFO overrun and underrun conditions.

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