YMF754-R datasheet(49/60 Pages) YAMAHA

49 / 60 page

YMF754

June 28, 1999

-49-

7. Zoomed Video Port

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

2S format.

15 14 13 12 11 10 9 876 543 210

15 14 13 12 11 10 987 65432 10

LEFT Channel

RIGHT Channel

SCLK

DATA

LRCK

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.

ZVBCLK

DS-1E

ZV Port

ZVLRCK

ZVSDI

MCLK

DATA

LRCK

SCLK

Open

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.

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