YMF754-V ETC, YMF754-V Datasheet - Page 49
YMF754-V
Manufacturer Part Number
YMF754-V
Description
DS-1E
Manufacturer
ETC
Datasheet
1.YMF754-V.pdf
(60 pages)
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7. Zoomed Video Port
YMF754
Zoomed Video Port is defined in the PC Card Standard (PCMCIA) applicable to the notebook PC or other
systems. This port is used to directly output video and/or audio signals onto the PCMCIA bus for D/A
conversion process, and connect them directly to the video and/or audio signal processing chips on the PC
system. Its major applications include MPEG decoder card and video capture card, etc.
Because the video and/or audio signals on the Zoomed Video Port have been output in synchronized
condition, DS-1E mixes it with the other audio signals, and outputs to AC’97 or SPDIF.
Audio signals to be transferred on the Zoomed Video Port include bit clock (SCLK), L/R clock (LRCK) and
serial data (DATA), and they are provided as outputs in the format defined below. This is generally called
I
In the Zoomed Video Port, synchronization with a master clock supplied from the bus is inherently required.
However, DS-1E can asynchronously process audio signal input via the Zoomed Video Port, eliminating the
need for master clock.
Sampling rate of the audio signals input via the Zoomed Video Port is resampled to 96.0kHz sampling
frequency at the stage followed by the SRC block, then converted to 48.0kHz sampling rate in the SRC block
stage. Sampling rates to be supported on the Zoomed Video Port include 22.05kHz, 32.0kHz, 44.1kHz and
48.0kHz.
Interface connection arrangement between the DS-1E and the Zoomed Video Port is as illustrated below.
The Zoomed Video Port is used to be selected between SPDIF input on YMF744B (DS-1S). However, on
DS-1E, the both functions can be used at the same time.
SCLK
DATA
LRCK
2
S format.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
LEFT Channel
ZVLRCK
ZVBCLK
ZVSDI
DS-1E
-49-
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Open
ZV Port
SCLK
LRCK
DATA
MCLK
RIGHT Channel
June 28, 1999
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