USBB17AP77016-XXX-B11 NEC Electronics, USBB17AP77016-XXX-B11 Datasheet - Page 23

• Manufacturer Part Number: USBB17AP77016-XXX-B11
• Description: DSP middleware(WMA (Windows Media Audio)decoder)
• Manufacturer: NEC Electronics

[Function request specifications]
• Store data of the requested size (argument: R0 bytes) in the user-defined input buffer in
• The value of the R0 argument is between 1 and 128 (inclusive) when acquiring the data
• The value of the R1 argument is always higher than the value of R1 when the
• When the value of the R1 argument is equal to or lower than the terminal position (value
• When the value of the R1 argument is higher than the terminal position (value of
the X memory starting from the position of the offset from the start of the bit stream data
(argument: R1 byte number), and set the size of the acquired data to the R0 register and
the start address of the input buffer to the R2L register (refer to Figure 2-2 Setting
Data in Input Buffer). The input buffer that stores the bit stream data must have a
capacity of at least 64 words (128 bytes) (refer to 2.5 Memory Configuration).
required for decoding. When this value exceeds 128, bit stream data not required for
decoding is skipped, so data does not need to be set in the input buffer. Be sure,
however, to set the acquired data size for the R0 return value.
wmad_FileCBGetData function was previously called.
wmad_FileCBGetData function is first called is 0. Therefore bit stream data up to the
value of R1 when the wmad_FileCBGetData function was previously called is always
completely decoded.
of previous argument R1 + R0) of the bit stream data read when the
wmad_FileCBGetData function was previously called (case A), it is necessary to keep all
but the first byte of the data previously set in the input buffer
save all but the first byte of the data set in the input buffer when the
wmad_FileCBGetData function was previously called until that function is next called.
Note that if the µ SAP77016-B11 is operating normally, the contents of the input buffer
set by the user are never changed.
Note If the previous value of the R0 argument exceeded 128, case A will not occur.
previous argument R1 + R0) of the bit stream data read when the wmad_FileCBGetData
function was previously called, data in which the offset is less than the value of R1 is
never used.
CHAPTER 2 LIBRARY SPECIFICATIONS
User’s Manual U15683EJ1V0UM
The R1 value when the
Note
. Therefore, be sure to
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