CS47L85 datasheet(200/370 Pages) CIRRUS

200 / 370 page

CS47L85

200

Rev 4.3

SLIMBUS CONTROL REGISTER ACCESS

Control register access is supported via the SLIMbus interface. Full read/write access to all registers is possible, via the

“User Value Elements” portion of the Value Map.

If the SLIMbus interface is used to access the DSP firmware memory registers, then a system clocking constraint must be

observed: the DSPCLK frequency, if enabled, must be greater than 1.3 x RF, where RF is the SLIMbus Root Frequency.

Note that, if DSPCLK is disabled (DSP_CLK_ENA=0), or if accessing other areas of the Register Map, the timing constraint

is not applicable. See “DSP Firmware Control” for details of the DSP Firmware memory. See “Clocking and Sample Rates”

for details of the DSPCLK signal.

required, depending on circumstances: the first “CHANGE_VALUE” message selects the register page (bits [23:8] of the

Control Register address); the second message contains the data and 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 62 and Table 63, for the generic case of writing the value 0xVVVV

to control register address 0xYYYYZZ. Note that it is also possible to write blocks of up to 16 bytes (to consecutive register

addresses), as described below.

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 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 62 Register Write Message (1)

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 CS47L85 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 63 Register Write Message (2)

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

sent to the CS47L85.

Write transfers of up to 16 bytes can be configured using the ‘Slice Size’ parameter in the second message (see Table 63).

Additional ‘Value Update’ words can be appended to the message in this case, with the applicable data contents. For

compatibility with the CS47L85 register map, the selected number of bytes must always be an even number.

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