Table of Contents
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1. Introduction
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The ZT 5504's serial controller resides in the National Semiconductor
PC87309 SuperI/O
device. The "SuperI/O" topic in Appendix E provides a link to the datasheet for this device.
Interrupts
Two enhanced, 8259-style interrupt controllers provide the ZT 5504 with a total of 15 interrupt
inputs. Interrupt controller features include support for:
• Level-triggered and edge-triggered inputs
• Individual input masking
• Fixed and rotating priorities
Interrupt sources include:
• Counter/Timers
• Serial I/O
• Keyboard
• Printer Port
• Floppy disk
• IDE interface
• Real-Time Clock
• CompactPCI backplane (21154)
• On-board PCI devices
Enhanced capabilities include the ability to configure each interrupt level for active high-going
edge or active low-level inputs.
The ZT 5504's interrupt controllers reside in the Intel® 82371EB (PIIX4E) device. The
"Intel
440GX
AGPset" topic in Appendix E provides a link to the datasheet for this device.
Counter/Timers
Three 8254-style counter/timers, as defined for the PC/AT, are included on the ZT 5504.
Operating modes supported by the counter/timers include:
• Interrupt on count
• Frequency divider
• Square wave generator
• Software triggered
• Hardware triggered
• One shot
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