cl-pd6833 Cirrus Logic, Inc., cl-pd6833 Datasheet - Page 33

• Manufacturer Part Number: cl-pd6833
• Description: Pci-to-cardbus Host Adapter
• Manufacturer: Cirrus Logic, Inc.

CL-PD6833
PCI-to-CardBus Host Adapter
PCI Interrupt Signalling Mode
This is the default mode, as per the power-on-reset condition of the Misc Control 3 register. It uses pins
203 and 204 directly as the PCI-type ‘INT#’ open-drain interrupts (refer to
is not programmed for Ring Indicate, INTA# is used for function 0 and INTB# is used for function 1. If the
CL-PD6833 is programmed for Ring Indicate, INTA# is used for both function 0 and 1. Ring-Indicate output
appears on INTB#. Programming PC Card interrupts (Interrupt and General Control register, index 3h)
or management interrupts (Management Interrupt Configuration register, index 5h) does not affect PCI
mode.
PC/PCI Serial Interrupt Signalling Mode
This mode supports the Mobile PC/PCI Extended Interrupt Programming Model. In this mode, two pins
(pin 205 functioning as SOUT# and 206 functioning as SIN#) interface with an SIC (serial interrupt con-
troller). The number of interrupts supported depends on the SIC configuration.
The SIN# pin on the CL-PD6833 is the serial interrupt input line from other devices in the interrupt loop,
and the SOUT# pin is the serial interrupt output line containing the logical ‘AND’ of the interrupt level in
the CL-PD6833, along with SIN# interrupts. The SIC is clocked by PCI_CLK, and CLKRUN# is used by
the CL-PD6833 to restart PCI_CLK if it has stopped.
In this mode, pin 204 is INTB#/RI_OUT* and pin 203 is INTA#. Program Misc Control 2 register bit 7 to
‘1’ for ring indicate function.
June 1998
ADVANCE DATA BOOK v0.3
Figure 3-9. PC/PCI Serial Interrupt Signalling Mode
Figure 3-8. PCI Interrupt Signalling Mode
CL-PD6833
INTB#/RI_OUT* (204)
SOUT#/ISLD (205)
SIN#/ISDAT (206)
(A Common Interrupt Mapping)
CL-PD6833
INTA# (203)
INTB#/RI_OUT* (204)
INTA# (203)
INTA#
INTB#/RI_OUT*
PCI_CLK
INTA#
INTB#/RI_OUT*
SIN#
SOUT#
SIC
INTRODUCTION TO THE CL-PD6833
PCI BUS
Figure
IRQ[X]
3-8). If the CL-PD6833
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