CS47L35 datasheet(127/300 Pages) CIRRUS

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DS1085F3

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CS47L35

4.9 SLIMbus Control Sequences

• The CHANGE_VALUE (EC, VU) message is used to write data to a specified element in the value map. The payload

of this message contains the element code (EC) and the value update (VU). The value update bytes contain the

new value of the applicable parameter.

4.9.4

Frame and Clocking Management

This section describes the SLIMbus messages associated with changing the frame or clocking configuration. One or more

configuration messages may be issued as part of a reconfiguration sequence; all of the updated parameters become

active at once, when the reconfiguration boundary is reached.

• The BEGIN_RECONFIGURATION message is issued to define a reconfiguration boundary point: subsequent

NEXT_* messages become active at the first valid superframe boundary following receipt of the RECONFIGURE_

NOW message. (A valid boundary must be at least two slots after the end of the RECONFIGURE_NOW message.)

Both of these messages have no payload content.

• The NEXT_ACTIVE_FRAMER (LAIF, NCo, NCi) message is used to select a new device as the active framer. The

payload of this message includes the logical address, incoming framer (LAIF). Two other fields (NCo, NCi) define

the number of clock cycles for which the CLK line shall be inactive during the handover.

• The NEXT_SUBFRAME_MODE (SM) and NEXT_CLOCK_GEAR (CG) messages are used to reconfigure the

SLIMbus clocking or framing definition. The payload of each is the respective subframe mode (SM) or clock gear

(CG) respectively.

• The NEXT_PAUSE_CLOCK (RT) message instructs the active framer to pause the bus. The payload of the

message contains the restart time (RT), which indicates whether the interruption is to be of a specified time and/or

phase duration.

• The NEXT_RESET_BUS message instructs all components on the bus to be reset. In this case, all devices on the

bus are reset and are disconnected from the bus. Subsequent reconnection to the bus follows the same process as

when the bus is first initialized.

• The NEXT_SHUTDOWN_BUS message instructs all devices that the bus is to be shut down.

4.9.5

Data Channel Configuration

This section describes the SLIMbus messages associated with configuring a SLIMbus data channel. Note that the

manager device is responsible for allocating the available bandwidth as required for each data channel.

• The CONNECT_SOURCE (PN, CN) and CONNECT_SINK (PN, CN) messages are issued to the respective

devices, defining the ports between which a data channel is to be established. Note that multiple destinations (sinks)

can be configured for a channel, if required. The payload of each message contains the port number (PN) and the

channel number (CN) parameters.

• The BEGIN_RECONFIGURATION message is issued to define a Reconfiguration Boundary point: subsequent

NEXT_* messages become active at the first valid superframe boundary following receipt of the RECONFIGURE_

NOW message. A valid boundary must be at least two slots after the end of the RECONFIGURE_NOW message.

• The NEXT_DEFINE_CHANNEL (CN, TP, SD, SL) message informs the associated devices of the structure of the

data channel. The payload of this message contains the channel number (CN), TP, SD, and SL parameters for the

data channel.

• The NEXT_DEFINE_CONTENT (CN, FL, PR, AF, DT, CL, DL), or CHANGE_CONTENT (CN, FL, PR, AF, DT, CL,

DL) message provides more detailed information about the data channel contents. The payload of this message

contains the channel number (CN), frequency locked (FL), presence rate (PR), auxiliary bits format (AF), data type

(DT), channel link (CL), and data length (DL) parameters.

• The NEXT_ACTIVATE_CHANNEL (CN) message instructs the channel to be activated at the next reconfiguration

boundary. The payload of this message contains the channel number (CN) only.

• The RECONFIGURE_NOW message completes the reconfiguration sequence, causing all of the NEXT_

messages since the BEGIN_RECONFIGURATION to become active at the next valid superframe boundary. (A

valid boundary must be at least two slots after the end of the RECONFIGURE_NOW message.)

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