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Section 23 CD-ROM Decoder
Page 1236 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
6 BITEND 0 R/W Specifies treatment of the bit order of the input data
from the serial sound interface.
When this bit is set to 1, the bits within each byte are
rearranged to place them in reverse order, bit 0 bit 7
to bit 7 bit 0.
5, 4 BUFEND0
[1:0]
01 R/W These bits select whether to change the order of 16-bit
units of data transferred from the serial sound interface
or suppress the stream data. In the serial sound
interface, either “padding mode” or “non-padding mode”
is selectable. In non-padding mode, each 32 bits of data
transferred from the serial sound interface are CD-ROM
data. Since the CD-ROM decoder has two 16-bit input
data registers, the order of the 16-bit data can be
swapped within the 32 bits. On the other hand, in
padding mode each 32 bits of data transferred from the
serial sound interface includes padding. Since the
padding is without meaning, it should be kept out of the
input stream to the decoder. This suppression can be
specified by the setting of this register.
The CD-ROM decoder handles data as a stream of 16-
bit data, and this register controls which 16-bit portion of
each 32 bits of data transferred from the serial sound
interface should be input first.
00: The 16 bits of stream data that would otherwise be
processed first is discarded.
01: The higher-order 16 bits of each 32 bits of data
received from the serial sound interface are placed
first in the stream to the decoder.
10: The lower-order 16 bits of each 32 bits of data
received from the serial sound interface are placed
first in the stream to the decoder.
11: Setting prohibited