PM7323 datasheet(43/219 Pages) PMC

43 / 219 page

STANDARD PRODUCT

PM7323 RCMP-200

DATASHEET

PMC-960543

ISSUE 2

ROUTING CONTROL, MONITORING, & POLICING

200 MBPS

Proprietary and Confidential to PMC-Sierra, Inc.

and for its Customer’s Internal Use.

FUNCTIONAL DESCRIPTION

The RCMP-200 receives cells from up to 32 PHY devices, processes them, and

passes them to a single switch port or queue manager. The RCMP-200 device

operates as a multi-PHY master on its input side. Round-robin polling selects

between the PHY devices based on the availability of cells.

The Output Cell Interface operates as a single-PHY slave. The RCMP-200

informs the bus master if it has a cell available for transfer out by asserting OCA,

and waits for the bus master to assert the ORDENB signal to effect the transfer.

If the output buffer becomes full, the RCMP-200 will apply back-pressure to all its

input PHYs.

Logical multicasting is possible, although the system design must take into

account the fact that the input PHYs may be backed-up as a result - with possible

cell loss occurring.

9.1

Input Buffering

Cells received on the extended cell format SCI-PHY compatible Input Cell

Interface are buffered in a 4 cell deep FIFO. The input buffer provides for the

separation of internal timing from asynchronous external devices.

The SCI-PHY cell interface operates at clock rates up to 25 MHz and supports 8

bit wide data structures with programmable lengths. The data structure contains

a 52 (HEC excluded) or 53 byte ATM cell and up to 10 appended bytes. The

start of the data structure is indicated by the ISOC input. Refer to the

"Operation" section for more detail on this data structure. The data bus is

protected by the IPRTY input. The parity can be configured to be odd or even.

The input FIFO filters all unassigned cells and cells reserved for the use of the

Physical Layer. Unassigned cells are identified by an all zero VPI/VCI value and

CLP=0. They are filtered without notification. Physical layer cells are identified

by an all zero VPI/VCI value and CLP=1. They are filtered with a resulting

maskable interrupt indication and a Physical Layer cell count increment. By

default, the cell coding is assumed to be for a Network-Network Interface (NNI);

therefore the VPI is taken to be twelve bits. If one of the PHY links is a User-

Network Interface (UNI) and the GFC field is non-zero, the cell will not be filtered

by the Input Cell Interface, but will be discarded by the VC Identification circuit.

As an option, all cells can be interpreted as UNI cells.

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