SH7263 Datasheet, PDF (1181/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 21 CD-ROM Decoder (ROM-DEC)
21.6 Usage Notes
21.6.1 Stopping and Resuming Buffering Alone During Decoding
When the data of the output stream are being not read out but operation of the CD-ROM decoder
has continued until the buffers are full, the BUF_NG bit in the CBUFST2 register is set to 1; after
that, the CD-ROM decoder becomes incapable of operation.
To stop buffering alone, clear the CBUF_EN bit in the CBUFCTL0 register to 0. If the automatic
buffering function is in use, clear the CBUF_AUT in the CBUFCTL0 register to 0 at the same
time. In this case, the sectors currently in the buffers must be read out.
To resume automatic buffering, set the CBUF_AUT and CBUF_EN bits in the CBUFCTL0
register at the same time.
21.6.2 When CROMST0 Status Register Bits are Set
1. When the ST_SECS bit in the CROMST0 register becomes set, stop decoding immediately
and retry from one sector before the sector that was being decoded.
2. When the ST_SECL bit in the CROMST0 register becomes set, stop decoding immediately
and retry from two sectors before the sector that was being decoded.
Rev. 2.00 Mar. 14, 2008 Page 1147 of 1824
REJ09B0290-0200