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Section 23 CD-ROM Decoder
Page 1196 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Figure 23.5 is a schematic diagram of the stream-data output control block.
On recognizing that one sector of CD-ROM data is ready in the core of the CD-ROM decoder, this
block ensures that the output stream-data register in the bus bridge section is empty and then starts
to acquire the data for output from the core of the CD-ROM decoder.
Output
stream data
Output stream-data
control signal
Core of CD-ROM decoder
Output stream-data
protocol controller
Figure 23.5 Schematic Diagram of the Stream-Data Output Control Block
This block has functions related to interrupts and direct memory access controller activation
control such as suspending and masking of interrupts, turning interrupt flags off after they are
read, asserting the activation signal to the direct memory access controller, and negating the
activation signal according to the detected amount of data that has been transferred.