8.25 Isochronous Receive Interrupt Event Register

The isochronous receive interrupt event set/clear register reflects the interrupt state of the isochronous receive contexts. An interrupt is generated on behalf of an isochronous receive context if an INPUT_* command completes and its interrupt bits are set to 1. Upon determining that the isochRx (bit 7) interrupt in the interrupt event register at OHCI offset 80h/84h (see Section 8.21) has occurred, software can check this register to determine which context(s) caused the interrupt. The interrupt bits are set to 1 by an asserting edge of the corresponding interrupt signal or by writing a 1 in the corresponding bit in the set register. The only mechanism to clear a bit in this register is to write a 1 to the corresponding bit in the clear register. See Table 8−18 for a complete description of the register contents.

Bit

31

30

29

28

27

26

 

25

24

23

22

 

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

Isochronous receive interrupt event

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

R

R

R

R

R

 

R

R

R

R

 

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

0

0

0

0

0

 

0

0

0

0

 

0

0

0

0

0

0

Bit

15

 

14

13

12

 

11

 

10

 

9

8

 

7

6

 

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

 

Isochronous receive interrupt event

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

 

R

R

R

 

R

 

R

 

R

R

 

R

R

 

R

R

RSC

RSC

RSC

RSC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

0

0

 

0

 

0

 

0

0

 

0

0

 

0

0

X

X

X

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Isochronous receive interrupt event

 

 

 

 

 

 

 

 

 

 

Offset:

 

A0h

set register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A4h

clear register [returns the contents of isochronous receive interrupt event register

 

 

 

 

 

bit-wise ANDed with the isochronous receive mask register when read]

 

 

Type:

 

Read/Set/Clear, Read-only

 

 

 

 

 

 

 

 

 

 

 

 

Default:

 

0000 000Xh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 8−18. Isochronous Receive Interrupt Event Register Description

BIT

FIELD NAME

TYPE

DESCRIPTION

 

 

 

 

31−4

RSVD

R

Reserved. Bits 31−4 return 0s when read.

 

 

 

 

3

isoRecv3

RSC

Isochronous receive channel 3 caused the interrupt event register bit 7 (isochRx) interrupt.

 

 

 

 

2

isoRecv2

RSC

Isochronous receive channel 2 caused the interrupt event register bit 7 (isochRx) interrupt.

 

 

 

 

1

isoRecv1

RSC

Isochronous receive channel 1 caused the interrupt event register bit 7 (isochRx) interrupt.

 

 

 

 

0

isoRecv0

RSC

Isochronous receive channel 0 caused the interrupt event register bit 7 (isochRx) interrupt.

 

 

 

 

8−24

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Texas Instruments PCI7411, PCI7611 manual Isochronous Receive Interrupt Event Register, Isochronous receive interrupt event