8.45 Isochronous Receive Context Command Pointer Register

The isochronous receive context command pointer register contains a pointer to the address of the first descriptor block that the PCI7x21/PCI7x11 controller accesses when software enables an isochronous receive context by setting bit 15 (run) in the isochronous receive context control register (see Section 8.44) to 1. The n value in the following register addresses indicates the context number (n = 0, 1, 2, 3).

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

Isochronous receive context command pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

R

R

R

R

R

R

R

R

R

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Bit

15

 

14

13

12

 

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

Isochronous receive context command pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

 

R

R

R

 

R

R

R

R

R

R

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

X

 

X

X

X

 

X

X

X

X

X

X

X

X

X

X

X

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Isochronous receive context command pointer

 

 

 

 

 

 

 

Offset:

 

40Ch + (32 * n)

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

 

XXXX XXXXh

 

 

 

 

 

 

 

 

 

 

 

 

8−43

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Texas Instruments PCI7421, PCI7411, PCI7611, PCI7621 manual Isochronous Receive Context Command Pointer Register, 43