[OPTi]

Overview
This document describes the OPTi FireLink 1394 OHCI Link Controller (82C881). It details:
• Signal Definitions
• Strap Selectable Options
• Functionality
• Register Descriptions.

FEATUREs
The OPTi 82C881 1394 OHCI Link Controller is a PCI-based host controller with the following features.
• Compliant with PCI Local Bus Specification 2.1
• Compliant with P1394a Draft 2.0 Standard for a Highperformance Serial Bus
• Interfaces to 33MHz, 32-bit PCI bus
• PnP (Plug and Play) compatible per PCI Local Bus Specification rev. 2.1
• 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
• Incorporates two wire industry-standard Serial EEPROM interface
• Functions as a 1394 cycle master
• Supports asynchronous and isochronous transfers at 100, 200 and 400 Mbps
• Implements a fully Bus Manager Capable node including an Isochronous Resource Manager
• 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
• 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.