CS4630 datasheet(19/38 Pages) CIRRUS

19 / 38 page

CS4630

DS445PP1

4.3

Subsystem Vendor ID Fields

The Subsystem ID and Subsystem Vendor ID con-

figuration fields can be loaded in two different

ways. For systems using an EEPROM, typically

add-in cards, the EEPROM auto loads the data. For

a system using BIOS, typically mother boards, the

Configuration Space is loaded at offset FCh (see

Table 2). Once these values are loaded they will ap-

pear in the Configuration Space offset 2Ch. The

Subsystem ID and Subsystem Vendor ID fields in

the PCI Configuration Space default to value

0000h unless an external EEPROM device is de-

tected or unless the host has written to the appropri-

ate internal register to program the values.

4.4

Dynamic Config Register

The Dynamic Configuration Register is primarily

used to configure the hardware to support the gen-

eration of the PME# signal to the PCI bus and store

the particular hardware configuration. Bit 31,

PME_Support Shadow, shadows bits 14-11 of the

configuration space PMC Register at offset 42h.

Bits 29-27 will shadow bits 8-6 of the PMC Regis-

ter if the Vaux_Sense pin is high indicating auxil-

lary power is available. Otherwise, bits 8-6 will be

set to ‘000’b. Bits 23-0 are general purpose

Read/Write bits and the definitions will be deter-

mined by the driver.

The Dynamic Configuration Register bits can be

loaded in two different ways. For systems using an

EEPROM typically add-in cards, the EEPROM

auto loads the data. For a system using BIOS, typi-

cally mother boards, the Dynamic Configuration

Dynamic Configuration Register bits will default to

value 0000h unless an external EEPROM device is

detected or unless the host has written to the appro-

priate internal register to program the values.

4.5

Interrupt Signal

The CS4630 PCI Interface includes an interrupt

controller function which receives interrupt re-

quests from multiple sources within the CS4630

device, and presents a single interrupt line (INTA)

to the host system. Interrupt control registers in the

CS4630 provide the host interrupt service routine

with the ability to identify the source of the inter-

rupt and to clear the interrupt sources. In the

CS4630, the single external interrupt is expanded

by the use of “virtual channels”. Each data stream

which is read from or written to a modular buffer is

assigned a virtual channel number. This virtual

channel number is signalled by the DMA sub-

system anytime the associated modular buffer

pointer passes the mid-point or wraps around. Vir-

tual channels are also used for message passing be-

tween the CS4630 and the host.

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