SH7261 datasheet(1038/1348 Pages) RENESAS

1038 / 1348 page

Section 21 CD-ROM Decoder (ROM-DEC)

Rev. 2.00 Sep. 07, 2007 Page 1006 of 1312

REJ09B0320-0200

21.5

Interrupt Sources

21.5.1

Interrupt and DMA Transfer Request Signals

Table 21.3 lists the interrupt signals and DMA transfer request signal generated by the CD-ROM

decoder, along with the meanings and the modules to which the signals are connected.

Table 21.3

Interrupt and DMA Transfer Request Signals

Name

Description

Connected To

ISEC

Transitions from sector to sector

INTC

ITARG

Access to a CD-ROM sector that is not the expected target

sector

INTC

ISY

A sync code from the CD-ROM with abnormal timing

INTC

IERR

An error that was not correctable by ECC correction or an error

indicated by EDC checking after ECC correction

INTC

IBUF

State changes in data transfer to the buffer

INTC

IREADY

Request for data transfer to the buffer for CD-ROM

INTC

DMA transfer

request

Request for data transfer to the buffer for CD-ROM

DMAC

The above interrupt signals are generated by the following sources

(1)

ISEC

This interrupt is generated when the sync code indicates a transition from sector to sector.

(2)

ITARG

This interrupt reports that the stream data transferred from the CD-DSP is not the data of the target

sector. The CD-ROM decoder checks the time data in the subcode. In correct operation, data

transfer is expected to start slightly before the target sector. An ITARG interrupt is generated in

the following cases.

• When data of a sector preceding the target sector by quite a few sectors have been transferred

• When data of a sector that comes after the target sector have been transferred

For the generation of this interrupt, ITARG is detected from the subcode. However, this interrupt

has no meaning in this LSI because CD-ROM data are transferred from the SSI module.

SH7261 Datasheet(PDF) 1038 Page - Renesas Technology Corp

SH7261 Datasheet(HTML) 1038 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL