GS1510-CQR データシートの表示（PDF） - Unspecified

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GS1510-CQR

HDTV Serial Digital Deformatter

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4. FLY WHEEL OPERATION

The flywheel logic will check the incoming video data for

valid video lines. If the incoming data represents a valid

line, the flywheel remains in sync with the incoming data. If

the incoming data represents an invalid line, the flywheel

will use the stored timing information for the past valid line

to generate the output HVF timing signals until three (3)

consecutive lines having identical timing are detected. In

this case, the new timing information will be saved and the

flywheel operation is updated to this new timing.

Mismatches between the HVF information decoded from

the data stream and that indicated by the flywheel will

trigger the EAV_ERR and SAV_ERR signals as shown in

Figure 3. HVF output timing is shown in Figure 2.

5. AUTOMATIC SWITCH LINE LOCK HANDLING

The automatic switch line lock is based on the assumption

that the switching of video sources will only cause the H

signal to be out of alignment whereas V and F signals

remain in sync; i.e. switching between video sources of the

same format. Therefore, when in the automatic switch line

lock mode (FAST_LOCK transitions for low to high), the

flywheel positive H signal transition will align with the

detected positive H signal transition. Timing for the

FAST_LOCK signal is shown in Figure 5.

TABLE 1: Source Format Parameters

Reference SMPTE

Standard

260m 260m 295m 274m 274m 274m 274m 274m 274m 274m 274m 296m 296m

Format ID

A

B

C

D

E

F

G

H

I

J

K

L

M

Lines/Frame

1125 1125 1250 1125 1125 1125 1125 1125 1125 1125 1125 750 750

Words/Active Line

(each channel Y,

Cb/Cr)

1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1280 1280

Total Active Lines

1035 1035 1080 1080 1080 1080 1080 1080 1080 1080 1080 720 720

Words/Total Line

(each channel Y,

Cb/Cr)

2200 2200 2376 2200 2200 2640 2200 2200 2640 2750 2750 1650 1650

Frame Rate (Hz)

30 30/M 25

30 30/M 25

30 30/M 25

24 24/M 60 60/M

Fields /Frame

2

2

2

2

2

2

1

1

1

1

1

1

1

Data Rate Divisor

1

M

1

1

M

1

1

M

1

1

M

1

M

NOTE: M=1.001 in the above table.

8

GENNUM CORPORATION

522 - 47 - 00

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