WM8281ECSSLASHR datasheet(170/392 Pages) CIRRUS

170 / 392 page

WM8281

170

Rev 4.0

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 re-connection to the

bus follows the same process as when the bus is first initialised.

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

DATA CHANNEL CONFIGURATION

This section describes the procedure for 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 Port(s) 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 will 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),

Transport Protocol (TP), Segment Distribution (SD), and the Segment Length (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.)

Active channels can be reconfigured using the CHANGE_CONTENT, NEXT_DEFINE_CONTENT, or

NEXT_DEFINE_CHANNEL messages. Note that these changes can be effected without interrupting

the data channel; the NEXT_DEFINE_CHANNEL, for example, may be used to change a Segment

Distribution, in order to reallocate the SLIMbus bandwidth.

An active channel can be paused using the NEXT_DEACTIVATE_CHANNEL message, and re-

instated using the NEXT_ACTIVATE_CHANNEL message.

Data channels can be disconnected using the DISCONNECT_PORT or NEXT_REMOVE_CHANNEL

messages. These messages provide equivalent functionality, but use different parameters (PN or CN

respectively) to identify the affected signal path.

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