CS493295 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS493295

Multi-Standard Audio Decoder Family

Cirrus Logic 

CS49300 Family DSP

RESET(LOW) (NOTE 1)

RESET(HIGH) (NOTE 2)

WAIT 500 µs

WRITE_*(DOWNLOAD_

BOOT, MSG_SIZE)

N

INTREQ LOW?

Y

READ_*(MESSAGE)

MESSAGE ==

N

BOOTSTART?

Y

WRITE_*(.LD FILE,

DOWNLOAD FILE SIZE)

TIMEOUT AFTER

20MS (NOTE 3)

EXIT(ERROR)

N

INTREQ LOW?

Y

READ_*(MESSAGE)

MESSAGE ==

N

BOOT_SUCCESS?

Y

WRITE_*(BOOT_

SUCCESS_RECEIVED,

MSG-SIZE)

WAIT 5 MS (NOTE 4)

TIMEOUT AFTER

20MS (NOTE 3)

EXIT(ERROR)

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 36.

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 36.

Application configuration

messages are covered in each

application code user’s manual.

DOWNLOAD COMPLETE

WRITE_*(HW_CONFIG_MSG,

HW_MSG_SIZE)

(NOTE 5)

WRITE_*(SW_CONFIG_MSG,

SW_MSG_SIZE)

(NOTE 5)

WRITE_*(KICKSTART,

MSG_SIZE)

(NOTE 5)

Figure 33. Typical Serial Boot and Download Procedure

DS339F7

55

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