CXD1812 View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

MFG CO.

CXD1812

ATAPI I/F CD-ROM DECODER

Sony Semiconductor 

CXD1812Q/R

bit 7:

bit 6:

bit 5:

bit 4, 3:

bit 2:

bit 1, 0:

C2PL1ST (C2PO lower byte first)

High: When 2 bytes of MDAT are input, C2PO inputs the lower byte first followed by the upper

byte.

Low: When 2 bytes of MDAT are input, C2PO inputs the upper byte first followed by the lower byte.

Here, "upper byte" means the upper 8 bits including MSB from the CD DSP and "lower byte"

means the lower 8 bits including LSB from the CD DSP. For example, the Header minute byte is

the lower byte and the second byte, the upper byte.

LCHLOW (Lch low)

High: When LRCK is low, determined to be the left channel data.

Low: When LRCK is high, determined to be the left channel data.

BCKRED (BCLK rising edge)

High: MDAT is strobed at the rising edge of BCLK.

Low: MDAT is strobed at the falling edge of BCLK.

BCKMD1, 0 (BCLK mode 1, 0)

These bits are set according to the number of clocks output for BCLK during one WCLK cycle by

the CD DSP.

BCKMD1

"L"

"L"

"H"

BCKMD0

"L"

"H"

"X"

16BCLKs/WCLK

24BCLKs/WCLK

32BCLKs/WCLK

LSB1ST (LSB first)

High: Connected with the CD DSP which outputs MDAT with LSB first.

Low: Connected with the CD DSP which outputs MDAT with MSB first.

RESERVED

2-6. XFRFMT0 (transfer format 0) register (address 05HEX)

The transfer format for automatic data transfer is determined by this register. This IC transfers the buffer

memory data to the host according to the Mode/Form value written by SCTINF register (address 1EHEX) into

the internal RAM by sector and the values of XFRFMT1 and 0 registers.

The Mode/Form of bits 3 to 1 depends on the values of bits 2 and 1 of SCTINF register.

Regarding Mode 2 in Yellow Book, don't care the Form2 (bit 2) of SCTINF register.

Set bits 3 to 1 of XFRFMT0 register high to transfer 2336 bytes of user data.

bit 7, 6:

bit 5:

bit 4:

bit 3:

RESERVED

SYNC

High: The Sync mark is transferred to the host.

Low: The Sync mark is not transferred to the host.

HEADER

High: The Header's 4 bytes are transferred to the host.

Low: The Header's 4 bytes are not transferred to the host.

SUBHEADER

High: Mode1: This bit has no meaning.

Mode 2: The Sub Header's 8 bytes are transferred to the host.

Low: The bytes above are not transferred to the host.

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