CS47L35 datasheet(132/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.10 SLIMbus Interface Control

Note: The first message may be omitted if its contents are unchanged from the previous CHANGE_VALUE message

sent to the CS47L35.

Write transfers of up to 16 bytes can be configured using the slice size parameter in the second message (see Table 4-56).

Additional value update words can be appended to the message in this case, with the applicable data contents. For

compatibility with the CS47L35 register map, the selected number of bytes must always be an even number.

When a 2-byte transfer is selected, these bytes are written to the register address 0xYYYYZZ (using the same naming

conventions as above). When more than 2 bytes are written in a single transfer, the destination register address is

automatically incremented as described in Table 4-57.

Note: Register addresses from R12288 (0x3000) upwards are formatted as 32-bit words. When writing to these

addresses, the slice size should be a multiple of 4 bytes and the byte address should be aligned with the 32-bit

data word boundaries (i.e., an even number). The byte ordering for these register addresses is described in

Table 4-58.

Table 4-55. Register Write Message (1)—CHANGE_VALUE

Parameter

Value

Description

Source Address

0xSS

SS is the 8-bit logical address of the message source. This could be any active device on the bus,

but is typically the manager device (0xFF).

Destination Address

0xLL

LL is the 8-bit logical address of the message destination (i.e., the CS47L35 SLIMbus interface

device). The value is assigned by the SLIMbus manager device.

Access Mode

0b1

Selects byte-based access mode.

Byte Address

0x800

Identifies the user value element for selecting the control register page address.

Slice Size

0b001

Selects 2-byte slice size

Value Update

0xYYYY

YYYY is bits [23:8] of the applicable control register address.

Table 4-56. Register Write Message (2)—CHANGE_VALUE

Parameter

Value

Description

Source Address

0xSS

SS is the 8-bit logical address of the message source. This could be any active device on the bus,

but is typically the manager device (0xFF).

Destination Address

0xLL

LL is the 8-bit logical address of the message destination (i.e., the CS47L35 SLIMbus interface

device). The value is assigned by the SLIMbus manager device.

Access Mode

0b1

Selects byte-based access mode.

Byte Address

0xUUU

Specifies the value map address, calculated as

0xA00 + (2 x 0xZZ), where ZZ is bits [7:0] of the applicable control register address.

Slice Size

0b001

Selects 2-byte slice size

Value Update

0xVVVV

VVVV is the 16-bit data to be written.

Table 4-57. SLIMbus Register Write Sequence—16-Bit Register Space (< 0x3000)

(<0x3000)

Byte Sequence

Base Address (0xYYYYZZ)

Bytes 2 and 1 (0xVVVV)

Base address + 1

Bytes 4 and 3

Base address + 2

Bytes 6 and 5

Base address + 3

Bytes 8 and 7

Base address + 4

Bytes 10 and 9

Base address + 5

Bytes 12 and 11

Base address + 6

Bytes 14 and 13

Base address + 7

Bytes 16 and 15

Table 4-58. SLIMbus Register Write Sequence—32-Bit Register Space (

 0x3000)

(

0x3000)

Byte Sequence

Base Address (0xYYYYZZ)

Bytes 4, 3, 2, 1

Base address + 2

Bytes 8, 7, 6, 5

Base Address + 4

Bytes 12, 11, 10, 9

Base Address + 6

Bytes 16, 15, 14, 13

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