CS494002 datasheet(74/100 Pages) CIRRUS

74 / 100 page

in the Section 10 “Hardware Configuration” on

page 78.

Note:

The software configuration messages

are specific to each application. The application

code user’s guide for each application provides

a list of all pertinent configuration messages.

Writing the KICKSTART message to DSPAB

begins the audio decode process.

8.2 Host Boot Via DSPC

A host controlled boot via DSPC is a sequence

where the host boots DSPAB and DSPC through

DSPC with two separate images (.ULD files).

Figure 53, "Host Boot Via DSPC" on page 75

demonstrates the interaction required by the

microcontroller.

1) A download sequence is started when the host

holds the mode pins appropriately (UHS[2:0]

and FHS[1:0]) and toggles RESET.

2) The

host

must

then

send

the

C_SLAVE_MODE boot message to DSPC.

This causes DSPC to initialize itself.

3) If the initialization was successful DSPC sends

out a C_BOOT_START message. The host

should proceed to step 4. If initialization fails,

the host should re-try steps 1 through 3 and if

failure is met again, the communication timing

and protocol should be inspected.

4) After

receiving

the

C_BOOT_START

message,

the

host

should

write

the

downloadable image for DSPAB(.ULD file) to

DSPC.

5) The host must wait for INTREQ to go low and

read the message from DSPC.

6) After reading out the C_BOOT_SUCCESS

message,

the

host

must

then

send

the

C_SLAVE_MODE message to DSPC once

more. This causes DSPC to initialize itself and

get ready to accept a stream.

7) If the initialization was successful DSPC sends

out a C_BOOT_START message. The host

should proceed to step 8. If initialization fails,

the host should re-try step 6. If failure is met

again, the communication timing and protocol

should be inspected.

8) After

receiving

the

C_BOOT_START

message,

the

host

should

write

the

downloadable image for DSPC.

9) The host must wait for INTREQ to go low and

read the message from DSPC.

10) After reading out the C_BOOT_SUCCESS

message.

The

host

must

send

the

C_SOFT_RESET message which will cause

the application code to reset and allow the

downloaded application to run.

11) If the soft reset was successful, DSPC sends out

a C_APP_START message the host can

proceed to step 8. If DSPC does not send an the

application start message, the host must re-try

the whole procedure again.

12) Next the host can send hardware and software

configuration messages for DSPC.

13) At this point the application code on DSPC is

running and the host needs to configure

DSPAB.

14) The host must read the AB_APP_START

message from DSPAB. If DSPAB does not

send an the application start message the host

must re-try

the whole

procedure again,

beginning at setp 1.

15) The host must send hardware and software

configuration messages for DSPAB.

16) At this point the application code on DSPAB is

running.

Note:

Hardware configuration messages are

used to define the behavior of the DSP’s audio

ports. A more detailed description of the

different hardware configurations can be found

in the Section 10 “Hardware Configuration” on

page 78.

Note:

The software configuration messages

are specific to each application. The application

code user’s guide for each application provides

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