82C881 データシートの表示（PDF） - Unspecified

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82C881

FireLink 1394 OHCI Link Controller

Unspecified 

FireLink 1394 OHCI

®

82C881

1.0 Features

• Supports asynchronous and isochronous transfers at

100, 200 and 400 Mbps

The OPTi 82C881 1394 OHCI Link Controller is a PCI-

based host controller with the following features.

• Implements a fully Bus Manager Capable node

including an Isochronous Resource Manager

• Compliant with PCI Local Bus Specification 2.1

• Compliant with P1394a Draft 2.0 Standard for a High-

performance Serial Bus

• Interfaces to 33MHz, 32-bit PCI bus

• PnP (Plug and Play) compatible per PCI Local Bus

Specification rev. 2.1

• Interfaces to PHYs that conform to the Link-PHY

interface described in Chapter 5 of the P1394a Draft

2.0 specification

• Interfaces to 1394-1995 compliant PHYs

• Offers selective disabling of 1394a features

(controllable by software) for interfacing to a partially

P1394a compliant PHY

• Implements IEEE1212-based control and status

registers that can be mapped to both I/O and memory

space

• Incorporates independent DMA controllers for

isochronous and asynchronous operations

• Supports four isochronous transmit and isochronous

receive contexts

• Supports burst transactions on the PCI bus interface

• Offers direct access to the physical address space of

the host

• Assigns priority for DMA per 1394 OHCI specification

1.00

• Supports four transmit and three receive configurable

FIFOs

• Offers both packet per-buffer and buffer-fill modes of

operation for the isochronous receive context

• Supports posting of physical write request packets

• Complies with the PCI Power Management

specification rev. 1.1, supporting ACPI states D0 and

D3hot and PME# generation

• Incorporates CLKRUN# support

• Implements comprehensive Debug Registers

• Implements physical upper bound register.

2.0 Overview

This document describes the OPTi FireLink 1394 OHCI

Link Controller (82C881). It details:

• Signal Definitions

• Strap Selectable Options

• Functionality

• Register Descriptions.

• Incorporates two wire industry-standard Serial

EEPROM interface

• Functions as a 1394 cycle master

FireLink 1394 System Block Diagram

1394

Port

FireLink

TriFire

82C881

1394

82C842

PHY

1394

Port

1394

Port

912-2000-031

Revision: 1.0

Page 1

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