LC78624E Datasheet, PDF (19/27 Pages) Sanyo Semicon Device – Compact Disc Player DSP

LC78624E
11. Bilingual Function
Code
$28
$29
$2A
Command
STO CONT
Lch CONT
Rch CONT
RES = low
q
• Following a reset or when a stereo ($28) command has been issued, the left and right channel data is output to the
left and right channels respectively.
• When an Lch set ($29) command is issued, the left and right channels both output the left channel data.
• When an Rch set ($2A) command is issued, the left and right channels both output the right channel data.
12. De-Emphasis; Pin 29: EMPH
The preemphasis on/off bit in the subcode Q control information is output from the EMPH pin. When this pin is high,
the LC78624E internal de-emphasis circuit operates.
13. C2 Flag Output; Pin 30: C2F
C2F output flag information in 8-bit units to indicate data error.
14. Digital Output Circuit; Pin 31: DOUT
This is an output pin for use with a digital audio interface. Data is output in the EIAJ format. This signal has been
processed by the interpolation and muting circuits. This pin has a built-in driver circuit and can directly drive a
transformer.
Code
$42
$43
$40
$41
$88
$8B
Command
DOUT ON
DOUT OFF
UBIT ON
UBIT OFF
CDROM-XA
ROMXA-RST
RES = low
q
q
q
• The DOUT pin can be locked at the low level by issuing a DOUT OFF command.
• The UBIT information in the DOUT data can be locked at zero by issuing a UBIT OFF command.
• The DOUT data can be switched to data for which interpolation and muting processing have not been performed by
issuing a CD-ROM XA command. (At this time, the audio output (the ROMXA pin) enters the mute mode.) While
a ROMXA-RST command is used to switch to the audio output for which interpolation and muting have been
performed. (At this time, audio output (the ROMXA pin) is released from the mute mode.)
15. Mute Control Circuit
Code
$01
$03
Command
MUTE: 0 dB
MUTE: –∞ dB
RES = low
q
Inputting the above command mutes the audio level (MUTE -∞ dB). Since zero-cross muting is used, there is very
little noise associated with this operation. The IC defines zero cross to be the ranges where the upper 7 bits of the data
are all zeros or all ones.
No. 5811-19/27