Host Controller Data Manual

4–7

4.5 CSR Compare Register

The CSR compare register is used to access 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

Type: Read-only

Offset: 10h

Default: XXXX XXXXh

4.6 CSR Control Register

The CSR control register is used to access the bus management CSR registers from the host through compare-swap

operations. This register is used to control the compare-swap operation and to select the CSR resource. See

Table 4–5 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 R/W R/W

Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X X

Type: Read/Write, Read/Update, Read-only

Offset: 14h

Default: 8000 000Xh

Table 4–5. CSR Control Register Description

BIT FIELD NAME TYPE DESCRIPTION

31 csrDone RU

This bit is set by the TSB12LV26 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 R/W

This field selects the CSR resource as follows:

00 = BUS_MANAGER_ID

01 = BANDWIDTH_AVAILABLE

10 = CHANNELS_AVAILABLE_HI

11 = CHANNELS_AVAILABLE_LO