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CS493122-CL Datasheet

  • CS493122-CL

  • Cirrus Logic [Multi-Standard Audio Decoder Family]

  • CIRRUS

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CS49300 Family DSP
Host Message (HOSTMSG) Register, A[1:0] = 00b
7
HOSTMSG7
6
HOSTMSG6
5
HOSTMSG5
4
HOSTMSG4
3
HOSTMSG3
2
HOSTMSG2
1
HOSTMSG1
0
HOSTMSG0
HOSTMSG7鈥?
Host data to and from the DSP. A read or write of this register operates handshake bits between
the internal DSP and the external host. This register typically passes multibyte messages car-
rying microcode, control, and configuration data. HOSTMSG is physically implemented as two
independent registers for input and output (read and write).
Host Control (CONTROL) Register, A[1:0] = 01b
7
Reserved
6
CMPRST
5
PCMRST
4
MFC
3
MFB
2
HINBSY
1
HOUTRDY
0
Reserved
Reserved
CMPRST
Always write a 0 for future compatibility.
When set, initializes the CMPDATA compressed data input channel. Writing a one to this bit
holds the port in reset. Writing zero enables the port. This bit must be low for normal operation.
(Write only)
When set, initializes the PCMDATA linear PCM input channel. Writing a one to this bit holds the
port in reset. Writing zero enables the port. This bit must be low for normal operation. (Write
only)
When high, indicates that the PCMDATA input buffer is almost full. (read only)
When high, indicates that the CMPDATA input buffer is almost full. (read only)
Set when the host writes to HOSTMSG. Cleared when the DSP reads data from the HOSTMSG
register. The host reads this bit to determine if the last host byte written has been read by the
DSP. (Read only)
Set when the DSP writes to the HOSTMSG register. Cleared when the host reads data from
the HOSTMSG register. The DSP reads this bit to determine if the last DSP output byte has
been read by the host. (read only)
Always write a 0 for future compatibility.
PCMRST
MFC
MFB
HINBSY
HOUTRDY
Reserved
PCM Data Input (PCMDATA) Register, A[1:0] = 10b
7
PCMDATA7
6
PCMDATA6
5
PCMDATA5
4
PCMDATA4
3
PCMDATA3
2
PCMDATA2
1
PCMDATA1
0
PCMDATA0
PCMDATA7鈥?
The host writes PCM data to the DSP input buffer at this address. (Write only)
Compressed Data Input (CMPDATA) Register, A[1:0] = 11b
7
CMPDATA7
6
CMPDATA6
5
CMPDATA5
4
CMPDATA4
3
CMPDATA3
2
CMPDATA2
1
CMPDATA1
0
CMPDATA0
CMPDATA7鈥?
The host writes compressed data to the DSP input buffer at this address. (Write only)
Table 5. Parallel Input/Output Registers
42
DS339PP4

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