CS49310 datasheet(55/86 Pages) CIRRUS

55 / 86 page

CS49300 Family DSP

DS339PP4

CS493XX

sends

out

the

boot

message

BOOT_START (0x01) and the host should

proceed to step 5.

4) If initialization fails, the CS493XX sends out

an INIT_FAILURE boot message byte (0xFD

or 0xFE), INVALID_MSG byte (0xFB), or

BOOT_ERROR byte (0xFA or 0xFC) and

spins waiting for a hard reset. The host should

re-try steps 1 through 3 and if failure is met

again, the serial communication timing and

protocol should be inspected.

5) After receiving the BOOT_START byte, the

host should write the downloadable image

(from the .LD file).

6) The end of the .LD file contains a three byte

checksum. If the checksum is good after

download,

the

CS493XX

will

send

BOOT_SUCCESS message (0x02) to the host.

If the checksum was bad, the CS493XX

responds

with

the

BAD_CHECKSUM

message byte (0xFF) and spins, waiting for

hard reset.

7) After reading out the BOOT_SUCCESS byte,

the

host

should

send

the

BOOT_SUCCESS_RECEIVED

message

(0x000005) which will cause an internal

application

code

reset

and

allow

the

downloaded application to run.

8) After waiting 5ms to allow the downloaded

application to initialize, the host can send

configuration messages for both hardware and

software configuration.

8.1.2. Parallel Download Sequence

The following is a detailed description of a parallel

download sequence for the CS493XX.

Note: When reading from the chip in a parallel

communication mode, the host must read the

HOSTCTL register and test the HOUTRDY bit

before starting the read cycle.

1) A download sequence is started when the host

issues a hard reset and holds the mode pins

appropriately (WR, RD, and PSEL).

2) The host should then send the boot message

DOWNLOAD_BOOT

(0x000004).

This

causes the CS493XX to initialize itself for

download.

3) If

the

initialization

was

successful

the

CS493XX

sends

out

the

boot

message

BOOT_START (0x01) and the host should

proceed to step 5.

4) If initialization fails, the CS493XX sends out

an INIT_FAILURE boot message byte (0xFD

or 0xFE), INVALID_MSG byte (0xFB), or

BOOT_ERROR byte (0xFA or 0xFC) and

spins waiting for a hard reset. The host should

re-try steps 1 through 3 and if failure is met

again, the serial communication timing and

protocol should be inspected.

5) After receiving the BOOT_START byte, the

host should write the downloadable image

(from the .LD file).

6) The end of the .LD file contains a three byte

checksum. If the checksum is good after

download,

the

CS493XX

will

send

BOOT_SUCCESS message (0x02) to the host.

If the checksum was bad, the CS493XX

responds

with

the

BAD_CHECKSUM

message byte (0xFF) and spins, waiting for

hard reset.

7) After reading out the BOOT_SUCCESS byte,

the

host

should

send

the

BOOT_SUCCESS_RECEIVED

message

(0x000005) which will cause an internal

application

code

reset

and

allow

the

downloaded application to run.

8) After waiting 5ms to allow the downloaded

application to initialize, the host can send

configuration messages for both hardware and

software configuration.

CS49310 数据表(PDF) 55 Page - Cirrus Logic

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CS49310 数据表(PDF) 55 Page - Cirrus Logic

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