CXD1196 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD1196

CD-ROM DECODER

Sony Semiconductor 

CXD1196AR

2.2 Read register

In the descriptions of the registers STS, HDRFLG, HDR, SHDR and CMADR, what is referred to as the

current sector refers to the sector where registers are valid for a decoder interrupt (DECINT). In the monitor

only and write only modes, the sector from the DSP for CD just before a decoder interrupt is called the

current sector. In the real time correction mode and repeat correction mode, the sector that has gone

through error detection and correction is referred to as the current sector.

2.2.1 Register Address (REGADR) Register

2.2.2 DMADATA Register

When data transfer (buffer read) is to be made in the I/O mode, the CPU reads data from this register.

2.2.3 Interrupt Status (INTSTS) Register

The values of the individual bits of this register indicate the respective associated values of interrupt status.

These bits are not affected by the values of the individual bits of the INTMSK register.

Bit7 ADPEND (ADPCM End)

Bit6 DECTOUT (DECODER Time Out)

Bit5 DMACMP (DMA Complete)

Bit4 DECINT (DECODER Interrupt)

Bit3 CIERR (Coding Information Error)

2.2.4 Status (STS) Register

Bit7 DRQ (Data Request)

This bit indicates the value of the DRQ pin.

Bit6 ADPBSY (ADPCM BUSY)

This bit goes ‘H’ during ADPCM playback.

Bit5 ERINBLK (Erasure in Block)

On all the bytes of the current sector except the SYNC byte, this bit goes ‘H’ if there is one or more

bytes from the DSP for CD whose C2 pointer is ON.

Bit4 CORINH (Correction Inhibit)

When the DECCTL register is set AUTODIST bit = ‘H’, this bit goes ‘H’ if the error flag is ON in the

MODE (and FORM) byte.

Bit3 EDCOK

Indicates EDC check showed there were no errors in the current sector.

Bit2 ECCOK

Indicates there are no more errors from the Header to P parity bytes in the current sector. (In the

MODE2, FORM2 sector, this bit is treated as a DON’T CARE bit.)

Bit1 SHRTSCT (Short Sector)

Indicates the Sync Mark interval was less than 2351 bytes. On this sector, neither ECC nor EDC is

executed.

Bit0 NOSYNC

Indicates that the SYNC Mark, not detected in the predetermined position, is one internally inserted.

2.2.5 Header Flag (HDRFLG) Register

Indicates the value of the error pointer of the Header and Sub Header registers.

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