SAA7780 datasheet(54/70 Pages) PHILIPS

54 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

Interrupt PIN Register - INTPIN (RO)

MIN_GNT Register - MINGNT (RO)

MAX_LAT Register - MAXLAT (RO)

Bit

Name

R/W

Function

7:0

INTLINE

Interrupt Line. The Interrupt Line register is an eight bit register used to

communicate interrupt line routing information. The value in this register tells

which input of the system interrupt controller(s) the SAA7780 Device's

interrupt pin is connected to. It is set to 00h to use function 0’s interrupt line.

There is no legacy interrupt support for function 1.

PCI CFG 1

Offset 3Dh

INTPIN[7:0]

POR Value

Bit

Name

R/W

Function

7:0

INTPIN

Interrupt Pin. The interrupt pin register tells which interrupt the SAA7780

device uses. The read only value of 00h implies that the SAA7780 device

shares the INT A interrupt pin with function 0. There is no legacy interrupt

support for function 1.

PCI CFG 1

Offset 3Eh

MINGNT[7:0]

POR Value

Bit

Name

R/W

Function

7:0

MINGNT

Minimum grant specifies how long of a burst period the device needs

assuming a clock speed of 33MHz. Since the SAA7780, function 1, is a

target only, this register is read only and set to zero.

PCI CFG 1

Offset 3Fh

MAXLAT[7:0]

POR Value

SAA7780 Datasheet(PDF) 54 Page - NXP Semiconductors

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