PM7375-SC datasheet(107/430 Pages) PMC

107 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

9.15

Microprocessor Interface

The microprocessor interface is provided for device configuration, control and

monitoring by an external local microprocessor. For applications where local

microprocessor control is not required and all device operations are performed by

the PCI Host, the microprocessor interface allows the PCI Host access the

LASAR-155 Local Bus.

When the interface is configured for slave mode operation, normal mode registers,

test mode registers and the micro/PCI Host mailbox can be accessed through this

port. Normal mode registers are required for normal operation, test mode registers

are used to enhance the testability of the LASAR-155 and the micro/PCI Host

mailbox allows communication between the microprocessor and PCI Host without

external support devices.

When the interface is configured for master mode operation, the PCI Host can

access the LASAR-155 Local Bus. The LASAR-155 Local Bus supports up to two

devices without requiring any external logic.

9.16

Microprocessor and PCI Host Normal Mode Register Memory Map

The LASAR-155 supports three different normal mode register types. The register

types can be distinguished by their master. The register types are defined below:

1) Microprocessor Only Access registers (MO) - these registers can only be

accessed through the microprocessor interface and cannot be accessed

through the PCI port.

2) PCI Host Only Access registers (PO) - these registers can only be accessed

through the PCI Host interface and cannot be accessed directly using the

microprocessor interface. However, indirect access via the microprocessor

interface is provided.

PM7375-SC Datasheet(PDF) 107 Page - PMC-Sierra, Inc