CL-PD6833-QC-A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CL-PD6833-QC-A' PDF : 216 Pages View PDF
CL-PD6833
PCI-to-CardBus Host Adapter
TV
LCD
CRT
DRAM
ANALOG ENCODER
SPEAKERS
AMP
CL-GD7XXX
AUDIO
CODEC
19
ZV PORT
(Video)
4
PCM
AUDIO
INPUT
4 AUDIO
PCM CONVERTER
AUDIO
CL-PD6833
MOTHERBOARD
PC CARD
INTERFACE
VIDEO DECODER
VIDEO
NTSC/PAL RF SIGNAL
19 VIDEO & CONTROL
PC CARD
Figure 3-5. A Typical ZV Port Implementation
3.1.4
Interrupts
The I/O-type PC Cards usually have interrupts that need to be serviced by host software. For example, for a
modem card accessed as if at COM1, the software would expect the modem to generate interrupts on the
IRQ4 line. To be sure all interrupts are routed as expected, the CL-PD6833 can steer the interrupt from the
PC Card to one of the four PCI-bus-defined interrupts or to one of several standard PC interrupts. The
CL-PD6833 supports four interrupt schemes: PCI Interrupt, Intel’s PC/PCI Serial Interrupt, PCI/Way
Interrupt, and External-Hardware Interrupt.
The CL-PD6833 allows sharing of interrupts under software control. This is accomplished by programming
the CL-PD6833 to alternately pulse and then tristate the desired interrupt pin. In addition, the CL-PD6833
allows two I/O devices to share one interrupt line in systems that have only one interrupt line and all interrupt
requests are routed to that one interrupt line. For example, if two fax/modem cards are inserted into the dual-
socket PC Card controller, and both are active and share the only interrupt line provided by the host system,
then the application software can still identify the requester and the type of the pending interrupt.
30
INTRODUCTION TO THE CL-PD6833
ADVANCE DATA BOOK v0.3
June 1998
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