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Número de pieza QT82C881
Descripción FireLink 1394 OHCI Link Controller
Fabricantes Opti 
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QT82C881 datasheet

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QT82C881 pdf
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
FireLink
82C881
1394
TriFire
82C842
PHY
1394
Port
1394
Port
1394
Port
912-2000-031
Revision: 1.0
Page 1

5 Page

QT82C881 arduino
FireLink 1394 OHCI
82C881
3.3 Strapping Options
3.3.1 Test Mode Selection (Pins 77, 78)
Pin 78, TMS#
Pin 77, TEST#
Pulled up
Pulled down
Don't care
Pulled down
Pulled down
Pulled up
3.3.2 Serial EEPROM Presence Detect (Pin 5)
Pin 5, SDA
Serial EEPROM
Pulled down
Pulled up
Not present
Present
Function
Normal Operation
Scan Chain Test mode
NAND Tree Test mode
Function
Load default values on PCI registers.
Load PCI values from EEPROM
Page 6
®
912-2000-031
Revision: 1.0

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