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Section 23 CD-ROM Decoder
R01UH0134EJ0400 Rev. 4.00 Page 1195 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Figure 23.4 is a schematic diagram of the stream-data input control block. The stream-data input
controller contains logic that controls the stream of input data and a register that is used to change
the control mode of the CD-ROM decoder.
The serial sound interface mode used to transfer the stream data may affect the order (through the
endian setting) or lead to padding before the data is transferred. To handle the different
arrangements of data appropriately, the stream-data input control block includes a register for
changing the operating mode and generates signals to control the core of the CD-ROM decoder.
The data holding registers for the input stream consists of two 16-bit registers. The data holding
registers are controlled according to the mode set in the control register. For example, controlling
the order in which 16-bit data is supplied to the core of the CD-ROM decoder (sending the second
16-bytes first or vice versa). It is also possible to stop the supply of padding data to the core of the
CD-ROM decoder.
Input stream data
Input stream controller
Core of CD-ROM decoder
Register data
Register access controller
Select
16 bits
16 bits
Figure 23.4 Schematic Diagram of the Stream-Data Input Control Block