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CS493122-CL Datasheet

  • CS493122-CL

  • Cirrus Logic [Multi-Standard Audio Decoder Family]

  • CIRRUS

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CS49300 Family DSP
RESET(LOW)
(NOTE 1)
RESET(HIGH)
(NOTE 2)
WAIT
500
碌s
WRITE_*(DOWNLOAD_
BOOT, MSG_SIZE)
Notes: 1. RESET must be held LOW for
t
rstl
.
INTREQ
LOW?
Y
READ_*(MESSAGE)
N
TIMEOUT AFTER
20MS
(NOTE 3)
MESSAGE ==
BOOTSTART?
Y
WRITE_*(.LD FILE,
DOWNLOAD FILE SIZE)
N
EXIT(ERROR)
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,
鈥淐ontrol鈥?on page 32.
3. Time-out values reflect worst
case response time for the
CS493XX. The values shown
may be used for the host鈥檚 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.
INTREQ
LOW?
Y
READ_*(MESSAGE)
N
TIMEOUT AFTER
20MS
(NOTE 3)
MESSAGE ==
BOOT_SUCCESS?
Y
WRITE_*(BOOT_
SUCCESS_RECEIVED,
MSG-SIZE)
N
EXIT(ERROR)
5. Hardware configuration
messages are covered in
Section 6, 鈥淐ontrol鈥?on page 32.
Application configuration
messages are covered in each
application code user鈥檚 manual.
WAIT 5 MS
(NOTE 4)
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
DS339PP4
53

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