參數(shù)資料
型號(hào)： KS9245
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Automated CD-ROM Controller(光盤驅(qū)動(dòng)器控制器器)
中文描述： 自動(dòng)CD - ROM控制器（光盤驅(qū)動(dòng)器控制器器）
文件頁數(shù)： 102/102頁
文件大小： 419K
代理商： KS9245
SAMSUNG
Version: TM 2.4
KS9245 ATAPI Automated CD-ROM Controller
Preliminary Technical Manual
_____________________________________________________________
Do Not Copy or Release
12-9
5.
Select the appropriate Audio Word Clock Length in the
Audio Clock Control Register
(Reg4E).
6.
Set the Address Pointer in the
DAC Block Address Registers
(Reg4A) to point to the
start of Audio Data in DRAM to be played.
7.
Set the
SPA
(Start Play Audio) bit to “1” in the
DAC Control Register
(Reg4D) to
start outputting the audio data pointed to by the
DAC Block Address Register
.
IEC-958 Digital Audio Support
Digital Audio support has traditionally been provided by the CD-DSP controllers and not the CD-
Decoders. However, since Decoders such as the KS9245 now provide support for CAV mode
playback by buffering the Audio data, Digital Audio on the DSP controllers cannot be used while
the Decoders are in CAV mode. Thus, to take advantage of both CAV and Digital Audio, the
KS9245 implements on-board Digital Audio support (EIAJ IEC-958 standard) using the
Sony/Philips Digital Signal format. This implementation comprises an DAUO pin (output pin 4) and
an DAUIN pin (input pin 16), as well as an DAUE (enable) bit in the
Audio Clock Control
Register
(Reg4Eh, bit5).
IEC-958 Digital Audio Configuration
To configure the Digital Audio channel for outputting audio data, CAV mode and the DAC interface
must first be properly configured (refer to CAV Mode Configuration described above and note that
a 33.8MHz system clock must be used). Once CAV mode and the DAC interface are configured,
setting both the
DAUE
bit (Reg4Eh) and the
SPA
bit (Reg4Dh) to “1” will allow IEC-958
Sony/Phillips Digital Audio formatted data to be output on the DAUO pin.
Note that the
ABPS
bit
(Reg4Eh) must be reset to “0”.
Additionally, when the Audio Bypass mode is selected, the
KS9245 allows the Digital Audio data to come from an outside source such as the CD-DSP. In this
case, the CD-DSP’ s DAUO pin would be connected to the KS9245’ s DAUIN pin, and the audio
data would be directly bypassed to the DAUO pin of the KS9245. The benefit of the feature is that
it allows for the same board design to support both CAV and CLV mode playback
. Note that in the
Digital Audio (DAU) Bypass mode, all audio channel mode controls such as channel muting,
channel swapping, and mono left and right channels have no affect on the Digital Audio data being
output on the DAUO. Thus, this data is always played back in stereo on the DAUO pin in DAU
Bypass mode.
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