82C881 Datasheet, PDF (5/46 Pages) List of Unclassifed Manufacturers – FireLink 1394 OHCI Link Controller

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
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