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
External-Hardware Interrupt Signalling Mode
In this mode, up to eight ISA IRQ interrupts and two PCI interrupts are supported. Two pins (pin 205
functioning as ISLD and pin 206 functioning as ISDAT) interface with external hardware, which converts
the signals to appropriate ISA-type IRQ totem-pole interrupt outputs.
INTA# (203)
INTB#/RI_OUT* (204)
SOUT#/ISLD (205)
SIN#/ISDAT (206)
CL-PD6833
INTA#
INTB#/RI_OUT*
ISLD
ISDAT
CL-PD6701
IRQ3
IRQ4
IRQ5
IRQ7
IRQ11
IRQ12
IRQ14
IRQ15
PCI_CLK
Figure 3-6. External-Hardware Interrupt Signalling Mode
The interrupts are serially passed on the ISDAT pin to the external hardware. The interrupts are shifted
into the external serial-to-parallel converter using PCI_CLK. The interrupts are latched using the ISLD
signal.
In this mode, pin 203 functions as INTA#, and pin 204 functions as INTB#/RI_OUT*. Refer to application
note Interrupt Signalling Modes for the CL-PD6730 and CL-PD6832 (AN-PD8).
This is the only mode that supports pulse mode interrupts. The CL-PD6833 contains unique logic that
allows ISA-style, IRQ-type interrupts to be shared under software control. This is accomplished by
programming the CL-PD6833 to alternately pulse and then tristate the desired interrupt pin, which is
programmed as an IRQ-type output. This unique IRQ interrupt sharing technique requires additional
software to allow for the sharing of interrupts.
PCI/Way Interrupt Signalling Mode
This mode of operation uses the PCI/Way single-pin interrupt system. In this mode one pin (pin 205) inter-
faces with a PCI/Way–compliant motherboard chip set.
INTA# (203)
INTB#/RI_OUT* (204)
SOUT#/ISLD (205)
SIN#/ISDAT (206)
CL-PD6833
INTA#
INTB#/RI_OUT*
IRQSER
IRQSER
Motherboard
Chip Set
PCI_CLK
Figure 3-7. PCI/Way Serial Interrupt Signalling Mode
The SOUT#/ISLD/IRQSER pin on the CL-PD6833 is the bidirectional serial interrupt line. In this mode,
pin 203 works as INTA# and pin 204 works as INTB#/RI_OUT*. Pin 206 is not used.
32
INTRODUCTION TO THE CL-PD6833
ADVANCE DATA BOOK v0.3
June 1998
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