Texas Instruments PCI7421 CSR Compare Register, CSR Control Register, CSR compare, CSR control

8.5 CSR Compare Register

The CSR compare register accesses the bus management CSR registers from the host through compare-swap operations. This register contains the data to be compared with the existing value of the CSR resource.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

Name

CSR compare

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

CSR compare

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:

CSR compare

Offset:

10h

Type:

Read-only

Default:

XXXX XXXXh

8.6 CSR Control Register

The CSR control register accesses the bus management CSR registers from the host through compare-swap operations. This register controls the compare-swap operation and selects the CSR resource. See Table 8−5 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								CSR control
Type	RU	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R
Default	1	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								CSR control
Type	R	R	R	R	R	R	R	R	R	R	R	R	R	R	RW	RW
Default	0	0	0	0	0	0	0	0	0	0	0	0	0	0	X	X
	Register:		CSR control
	Offset:		14h
	Type:		Read/Write, Read/Update, Read-only
	Default:		8000 000Xh

			Table 8−5. CSR Control Register Description
BIT	FIELD NAME	TYPE		DESCRIPTION
31	csrDone	RU	Bit 31 is set to 1 by the PCI7x21/PCI7x11 controller when a compare-swap operation is complete. It
			is cleared whenever this register is written.
30−2	RSVD	R	Reserved. Bits 30−2 return 0s when read.
1−0	csrSel	RW	This field selects the CSR resource as follows:
			00	= BUS_MANAGER_ID
			01	= BANDWIDTH_AVAILABLE
			10	= CHANNELS_AVAILABLE_HI
			11 = CHANNELS_AVAILABLE_LO

8−7