CS49300 datasheet(53/86 Pages) CIRRUS

53 / 86 page

CS49300 Family DSP

DS339PP4

Figure 33. Typical Serial Boot and Download Procedure

Notes: 1. RESET must be held LOW for

trstl.

2. It should be noted that mode

pins are used to configure the

CS493XX serial communication

mode. These mode pins are

latched internally on the rising

edge of reset. The pins can be

set dynamically by a

microprocessor or can be

statically pulled HIGH or LOW.

If these pins are driven

dynamically, setup and hold

times must be satisfied as

stated in the

CS493XX Data

Sheet. More information about

the function of the mode pins

can be found in the CS493XX

Data Sheet and in Section 6,

“Control” on page 32.

3. Time-out values reflect worst

case response time for the

CS493XX. The values shown

may be used for the host’s time-

out control loop.

4. 5 ms is typical but this time is

application code specific and

may be as high as 10 ms. Wait

times should be verified by the

designer.

5. Hardware configuration

messages are covered in

Section 6, “Control” on page 32.

Application configuration

messages are covered in each

application code user’s manual.

INTREQ LOW?

WRITE_*(DOWNLOAD_

RESET(LOW) (NOTE 1)

RESET(HIGH) (NOTE 2)

WAIT

500

µs

BOOT, MSG_SIZE)

TIMEOUT AFTER

20MS (NOTE 3)

READ_*(MESSAGE)

MESSAGE ==

BOOTSTART?

INTREQ LOW?

WRITE_*(.LD FILE,

TIMEOUT AFTER

20MS (NOTE 3)

DOWNLOAD FILE SIZE)

READ_*(MESSAGE)

MESSAGE ==

EXIT(ERROR)

BOOT_SUCCESS?

WRITE_*(BOOT_

SUCCESS_RECEIVED,

MSG-SIZE)

WAIT 5 MS (NOTE 4)

DOWNLOAD COMPLETE

WRITE_*(SW_CONFIG_MSG,

SW_MSG_SIZE)

(NOTE 5)

WRITE_*(KICKSTART,

MSG_SIZE)

(NOTE 5)

WRITE_*(HW_CONFIG_MSG,

HW_MSG_SIZE)

(NOTE 5)

EXIT(ERROR)

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