82378ZB

Features:

Provides the Bridge Between the PCI Bus and ISA Bus
100% PCI and ISA Compatible
   - PCI and ISA Master/Slave Interface
   - Directly Drives 10 PCI Loads and 6 ISA Slots
   - PCI at 25 MHz and 33 MHz
   - ISA from 6 MHz to 8.33 MHz
Enhanced DMA Functions
   - Scatter/Gather (S/G) (82378ZB)
   - Fast DMA Type A, B and F (82378ZB
   - Compatible DMA Transfers
   - 32-bit Addressability(82378ZB)
   - 27-bit Addressability(82379AB)
   - Seven Independently Programmabl Channels
   - Functionality of Two 82C37A DMA Controllers
Data Buffers to Improve Performance
   - 8-Byte DMA/ISA Master Line Buffer
   - 32-bit Posted Memory Write Buffer tISA
Integrated 16-bit BIOS Timer
Non-Maskable Interrupts (NMI)
   - PCI System Errors
   - ISA Parity Errors
Arbitration for ISA Devices
   - ISA Masters
   -DMA and Refresh
Four Dedicated PCI Interrupts
   - Level Sensitive
   - Mapped to Any Unused Interrupt
Arbitration for PCI Devices
   - Six PCI Masters Supported
   - Fixed, Rotating, or a Combination
Utility Bus (X-Bus) Peripheral Support
   - Provides Chip Select Decode
   - Controls Lower X-Bus Data Byte Transceiver
Functionality of One 82C54 Timer
   - System Timer
   -Refresh Request
   - Speaker Tone Output
Functionality of Two 82C59 Interrupt Controllers
   -14 Interrupts Supported
   -Edge/Level Selectable Interrupts
I/O APIC (Advanced Programmable Interrupt Controller (82379AB)
   -Support for Multi-Processor Systems
System Power Management (Intel SMM Support)
   - Programmable System Management Interrupt (SMI)aeaeHardware Events, Software Events, EXTSMI#
   - Programmable CPU Clock Control (STPCLK#)
   - Fast-On/Off Mode
208-Pin QFP Package


Pinout




Specifications

Case Temperature Under Bias.......................................... -65 to 110.
Storage Temperature .......................................................-65 to 150.
Supply Voltages with Respect to Ground .................-0.5V to V_CC  + 0.5V
Voltage On Any Pin ..................................................-0.5V to V_CC  + 0.5V

                                                                WARNING
Stressing the device beyond the "Absolute Maximum Ratings" may cause permanent damage. These are stress ratings only. Operation beyond the "Operating Conditions" is not recommended and extended exposure beyond the "Operating Conditions" may affect reliability.


Description

The 82378ZB System I/O (SIO) and 82379AB System I/O APIC (SIO.A) components are PCI-to-ISA Bus Bridge devices. These devices integrate many of the common I/O functions found in today's ISA-based PC systemsaea seven channel DMA controller, two 82C59 interrupt controllers, an 8254 timer/counter, a BIOS timer, Intel SMM power management support, and logic for NMI generation. In addition, the SIO and SIO.A each support a total of six PCI Masters, and four PCI Interrupts. Decode is provided for peripheral devices such as the flash BIOS, real time clock, keyboard/mouse controller, floppy controller, two serial ports, one parallel port, and IDE hard disk drive.

For both the SIO and SIO.A, each DMA channel supports compatibility transfers. The SIO also supports types A, B, and F transfers and scatter/gather. In addtion to the standard ISA-compatible interrupt controller that is in both the SIO and SIO.A, the SIO.A contains an Advance Programmable Interrupt Controller (IO APIC) for use in multi-processing systems.

This document describes both the 82378ZB (SIO) and 82379AB (SIO.A) components. Unshaded areas describe the 82378ZB. Shaded areas, like this one, describe differences between the 82379AB and  82378ZB.