CS47L85 datasheet(193/370 Pages) CIRRUS

193 / 370 page

CS47L85

Rev 4.3

193

SLIMBUS CONTROL SEQUENCES

This section describes the messages and general protocol associated with most aspects of the SLIMbus system.

Note that the SLIMbus specification permits some flexibility in Core Message support for different components. See

“SLIMbus Interface Control” for details of which message(s) are supported on each of the SLIMbus devices that are present

on the CS47L85.

DEVICE MANAGEMENT & CONFIGURATION

This section describes the SLIMbus messages associated with configuring all devices on the SLIMbus interface.

When the SLIMbus interface starts up, it is required that one (and only one) of the components provides the Manager and

Framer Device functions. Other devices can request connection to the bus after they have gained synchronisation.

The REPORT_PRESENT (DC, DCV) message may be issued by devices attempting to connect to the bus. The payload of

this message contains the Device Class (DC) and Device Class Version (DCV) parameters, describing the type of device

that is attempting to connect. This message may be issued autonomously by the connecting device, or else in response to

a REQUEST_SELF_ANNOUNCEMENT message from the Manager Device.

After positively acknowledging the REPORT_PRESENT message, the Manager Device will then issue the

ASSIGN_LOGICAL_ADDRESS (LA) message to allow the other device to connect to the bus. The payload of this message

contains the Logical Address (LA) parameter only; this is the unique address by which the connected device will send and

receive SLIMbus messages. The device is then said to be ‘enumerated’.

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 will be reset, and any associated Data Channels will be cancelled. Note that, if the RESET_DEVICE

command is issued to an Interface Device, it will cause a Component Reset (i.e., all Devices within the associated

component are reset). Under a Component Reset, every associated Device will release its Logical Address, and the

Component will become disconnected from the bus.

INFORMATION MANAGEMENT

A memory map of Information Elements is defined for each Device. This is arranged in 3 x 1kByte 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 CS47L85 SLIMbus Device are reserved.

Read/Write access is implemented using the messages described below. 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 element(s)

are to be cleared as part of the instruction.

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

message contains the Transaction ID (TID) and the Information Slice (IS). The Information Slice byte(s) 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

element(s) 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 byte(s) contain the new value of the applicable parameter.

CS47L85 Datasheet(PDF) 193 Page - Cirrus Logic

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