1. Introduction
19
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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