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CS493122-CL Datasheet

  • CS493122-CL

  • Cirrus Logic [Multi-Standard Audio Decoder Family]

  • CIRRUS

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CS49300 Family DSP
0x00000
D olby D igital with
Pro Logic II C ode
or
another Full D ownload C ode
0x00000
0x0FF FF
0x07FFF
0x08000
D olb y D igital with
Pro Logic II with C irrus
Ex tra S urround
Figure 40. Non-Paged Memory
M PE G M ultichannel with
Pro Logic II
0x0FFFF
0x10000
D T S-ES Exte nded Surrou nd
external ROM, in order to have access to the single
application code stored in the 32 kilobyte non-
paged memory. The host is completely isolated
from memory accesses in this situation. Once the
hardware has been designed, the DSP itself will be
responsible for all communication with the ROM.
0x17FFF
0x18000
D T S-ES N eo:6
0x1FFFF
0x20000
HDCD
8.7.2. 32 Kilobyte Paged Autoboot Memory
An external memory architecture which is paged
on 32 Kilobyte boundaries offers the higher end
system the ability to store several full download or
IBA application codes in each 32 Kilobyte page.
Figure 41 shows an example of a 32 Kilobyte
paged memory image for a the premium 6.1/7.1
channel system describe in Table 12 above.
The flow diagram given in Figure 36 demonstrates
the interaction required by the microcontroller
during autoboot. After placing the decoder into a
reset state, the host selects the page in memory
containing first code by driving uC15 to a low state.
The host also drives ABOOT low and holds it in a
low state until the rising edge of RESET to initiate
autoboot. As noted in the autoboot section, the
ABOOT pin should be connected to an open-drain
output of the microcontroller so as to allow the
specified pull-up resistor to generate the high
value. The open-drain driver is required because
the DSP will begin using the pin as an output after
a successful download (INTREQ and ABOOT are
multiplexed on the same pin).
After waiting for 175 ms, the download should
have completed. During the wait period, the host
should ignore all INTREQ behavior (mask the
INTREQ interrupt). The host can then verify that
the code has successfully initialized itself by
reading a variable from the application and
64
0x27FFF
0x28000
LO G IC 7
0x2FFFF
0x30000
M P3
0x37FFF
0x38000
Virtu al D olby D ig ital with
VM A x V irtualT heater
0x3FFFF
Add ress line uC 15, uC 16, a nd
uC 17 us ed fo r paging
Figure 41. Example Contents of a Paged 32 Kilobytes
External Memory (Total 256 Kilobytes)
checking the returned value against the default
value. Any variable can be used for the verification
step, but a robust design will select a variable
whose value is neither all 0鈥檚 nor all 1鈥檚. If the first
read attempt returns an incorrect value, a 5 ms wait
should be inserted and the read should be repeated.
If a second invalid number is read, the entire boot
process should be repeated. When the number
returned matches the default value for the variable
read, the host knows that the application is resident
in the DSP and awaiting further instruction. Please
see Section 8.2, 鈥淎utoboot鈥?on page 56 for more
information.
For systems that would prefer to store all
application codes in an external parallel Flash
Memory (vs. a OTP EPROM) in order to realize a
鈥渇ield-upgradable鈥?system, please contact
dsp_support@crystal.cirrus.com for information
DS339PP4

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