CS47L35 datasheet(133/300 Pages) CIRRUS

133 / 300 page

DS1085F3

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CS47L35

4.10 SLIMbus Interface Control

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 4-59 and Table 4-60, for the generic case of reading the

contents of control register address 0xYYYYZZ.

The CS47L35 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 represents 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 4-60.

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

sent to the CS47L35.

The CS47L35 responds to the register read commands in accordance with the normal SLIMbus protocols.

Note that the CS47L35 assumes that sufficient control space slots are available in which to provide its response before

the next REQUEST_VALUE message is received. The CS47L35 response is made using a REPLY_VALUE message; the

SLIMbus manager should wait until the REPLY_VALUE message has been received before sending the next REQUEST_

VALUE message. If additional REQUEST_VALUE messages are received before the CS47L35 response has been made,

the earlier REQUEST_VALUE messages are ignored (i.e., only the last REQUEST_VALUE message is serviced).

4.10.7 SLIMbus Clocking Control

The clock frequency of the SLIMbus interface is not fixed, and may be set according to the application requirements. The

clock frequency can be reconfigured dynamically as required.

The CS47L35 SLIMbus interface does not include a framer device. Accordingly, the SLIMCLK pin is always an input pin

on the CS47L35. The framer function can be transferred from one device to another; this is known as framer handover,

and is controlled by the manager device.

The supported root frequencies are as defined in the MIPI Alliance specification for SLIMbus.

Table 4-59. Register 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 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 4-60. Register Read Message (2)—REQUEST_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

Transaction ID

0xTTTT TTTT is the 16-bit transaction ID for the message. The value is assigned by the SLIMbus manager device.

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