CS47L35 datasheet(126/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.9 SLIMbus Control Sequences

Once a device has been successfully connected to the bus, the logical address (LA) parameter can be changed at any

time using the CHANGE_LOGICAL_ADDRESS (LA) message.

The RESET_DEVICE message commands an individual SLIMbus device to perform its reset procedure. As part of the

reset, all associated ports are reset, and any associated data channels are canceled. Note that, if the RESET_DEVICE

command is issued to an interface device, it causes a component reset (i.e., all devices within the associated component

are reset). Under a component reset, every associated device releases its logical address, and the component becomes

disconnected from the bus.

4.9.2

Information Management

A memory map of information elements is defined for each device. This is arranged in 3 x 1-kB blocks, comprising core

value elements, device class-specific value elements, and user value elements respectively, as described in the MIPI

specification. Note that the contents of the user information portion for each CS47L35 SLIMbus device are reserved.

Read/write access is implemented using the messages described as follows. Specific elements within the information map

are identified using the element code (EC) parameter. In the case of read access, a unique transaction ID (TID) is assigned

to each message relating to a particular read/write request.

• The REQUEST_INFORMATION (TID, EC) message is used to instruct a device to respond with the indicated

information. The payload of this message contains the transaction ID (TID) and the element code (EC).

• The REQUEST_CLEAR_INFORMATION (TID, EC, CM) message is used to instruct a device to respond with the

indicated information, and also to clear all, or parts, of the same information slice. The payload of this message

contains the transaction ID (TID), element code (EC), and clear mask (CM). The clear mask field is used to select

which elements are to be cleared as part of the instruction.

• The REPLY_INFORMATION (TID, IS) message is used to provide output of a requested parameter. The payload

of this message contains the transaction ID (TID) and the information slice (IS). The information slice bytes contain

the value of the requested parameter.

• The CLEAR_INFORMATION (EC, CM) message is used to clear all, or parts, of the indicated information slice. The

payload of this message contains the element code (EC) and clear mask (CM). The clear mask field is used to select

which elements are to be cleared as part of the instruction.

• The REPORT_INFORMATION (EC, IS) message is used to inform other devices about a change in a specified

element in the information map. The payload of this message contains the element code (EC) and the information

slice (IS). The information slice bytes contain the new value of the applicable parameter.

4.9.3

Value Management (Including Register Access)

A memory map of value elements is defined for each device. This is arranged in 3 x 1-kB blocks, comprising core value

elements, device class-specific value elements, and user value elements respectively, as described in the MIPI

specification. These elements are typically parameters used to configure device behavior.

The user value elements of the interface device are used on CS47L35 to support read/write access to the register map.

Details of how to access specific registers are described in Section 4.10.

Note that, with the exception of the user value elements of the interface device, the contents of the user value portion for

each CS47L35 SLIMbus device are reserved.

Read/write access is implemented using the messages described as follows. Specific elements within the value map are

identified using the element code (EC) parameter. In the case of read access, a unique transaction ID (TID) is assigned

to each message relating to a particular read/write request.

• The REQUEST_VALUE (TID, EC) message is used to instruct a device to respond with the indicated information.

The payload of this message contains the transaction ID (TID) and the element code (EC).

• The REPLY_VALUE (TID, VS) message is used to provide output of a requested parameter. The payload of this

message contains the transaction ID (TID) and the value slice (VS). The value slice bytes contain the value of the

requested parameter.

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