11.12 Interrupt Line Register

The interrupt line register is programmed by the system and indicates to the software which interrupt line the flash media interface has assigned to it. The default value of this register is FFh, indicating that an interrupt line has not yet been assigned to the function.

Bit

7

6

5

4

 

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

Interrupt line

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RW

RW

RW

RW

 

RW

RW

RW

RW

 

 

 

 

 

 

 

 

 

 

Default

1

1

1

1

 

1

1

1

1

 

 

 

 

 

 

 

 

 

 

Register: Interrupt line

Offset: 3Ch

Type: Read/Write

Default: FFh

11.13 Interrupt Pin Register

This register decodes the interrupt select inputs and returns the proper interrupt value based on Table 11−8, indicating that the flash media interface uses an interrupt. If one of the USE_INTx terminals is asserted, the interrupt select bits are ignored, and this register returns the interrupt value for the highest priority USE_INTx terminal that is asserted. If bit 28, the tie-all bit (TIEALL), in the system control register (PCI offset 80h, see Section 4.29) is set to 1, then the PCI7x21/PCI7x11 controller asserts the USE_INTA input to the flash media controller core. If bit 28 (TIEALL) in the system control register (PCI offset 80h, see Section 4.29) is set to 0, then none of the USE_INTx inputs are asserted and the interrupt for the flash media function is selected by the INT_SEL bits in the flash media general control register.

Bit

7

6

5

4

 

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

Interrupt pin

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

R

R

R

 

R

R

R

R

 

 

 

 

 

 

 

 

 

 

Default

0

0

0

0

 

0

X

X

X

Register: Interrupt pin

Offset: 3Dh

Type: Read-only

Default: 0Xh

Table 11−8. PCI Interrupt Pin Register

INT_SEL BITS

USE_INTA

INTPIN

 

 

 

 

 

 

 

00

0

01h

 

 

 

 

(INTA)

 

 

 

 

 

 

 

 

01

0

02h

 

 

 

 

 

(INTB)

 

 

 

 

 

10

0

03h

 

 

 

 

 

 

(INTC)

 

 

 

 

11

0

04h

 

 

 

 

 

 

(INTD)

 

 

 

 

XX

1

01h

 

 

 

 

(INTA)

 

11−8

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Texas Instruments PCI7621, PCI7411, PCI7611, PCI7421 manual 8. PCI Interrupt Pin Register, Intsel Bits Useinta Intpin, 11−8