CS47L85 datasheet(201/370 Pages) CIRRUS

201 / 370 page

CS47L85

Rev 4.3

201

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 auto-

incremented as described in Table 64.

Note that, 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 65.

(< 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 64 SLIMbus Register Write Sequence - 16-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

Table 65 SLIMbus Register Write Sequence - 32-bit Register Space (

≥ 0x3000)

are implemented using the “CHANGE_VALUE” and “REQUEST_VALUE” messages. A maximum

of two messages may be required, depending on circumstances:

the “CHANGE_VALUE” message selects the register page

(bits [23:8] of the Control Register address); the “REQUEST_VALUE” message contains bits [7:0] of the register address.

The first message may be omitted if the register page is unchanged from the previous Read or Write operation.

The required SLIMbus parameters are described in Table 66 and Table 67, for the generic case of reading the contents of

control register address 0xYYYYZZ.

The CS47L85 SLIMbus interface supports Register Read operations of 2-bytes (i.e., one 16-bit data word) only. Register

addresses from R12288 (0x3000) upwards are formatted as 32-bit words; when reading from these addresses, the 2-byte

data slice will represent the 2 lower bytes of the selected 32-bit word. The 2 upper bytes of the respective register can be

accessed by adding ‘2’ to the Byte Address value described in Table 67.

Read 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 CS47L85 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

Table 66 Register Read Message (1)

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