SPCA711A データシートの表示（PDF） - Unspecified

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SPCA711A

DIGITAL VIDEO ENCODER FOR VIDEOCD

Unspecified 

SPCA711A

! MASTER MODE

Horizontal sync (HSYNC*) and vertical sync (VSYNC*) are generated from internal timing and optional software

bits. HSYNC*, and VSYNC* are output following the rising edge of CLK. The horizontal counter is

incremented on every other rising edge of CLK. After reaching the appropriate value (determined by the mode

of operation), it is reset to one, indicating the start of a new line. The vertical counter is incremented at the start

of each new line. After reaching the appropriate value, determined by the mode of operation, it is reset to one,

indicating the start of a new field. VSYNC* is asserted for 3 or 2.5 scan lines for the 262/525 line and the

312/625 line, respectively.

! SLAVE MODE

Horizontal sync (HSYNC*) and vertical sync (VSYNC*) are inputs that are registered on the rising edge of the

CLOCK. The horizontal counter is incremented on the rising edge of the CLOCK. Two clock cycles after

falling edge of HSYNC*, the counter is reset to one, indicating the start of a new line. The vertical counter is

incremented on the falling edge of HSYNC*. A falling edge of VSYNC* resets it to one, indicating the start of a

new field. A falling edge of VSYNC* occurring within ±1/4 of a scan line from the falling edge of HSYNC* cycle

time (line time) indicates the beginning of Field 1. A falling edge of VSYNC* occurring within ±1/4 scan line

from the mid-point of the line indicates the beginning of Field 2.

The operating mode (NTSC/PAL) can be programmed with the MODEA and MODEB bits when the SETMODE

(MASTER pin) bit is set high. Alternatively, when the SETMODE bit is set low, the mode is automatically

changed to the slave mode. For example, 525-line operation is assumed, 625-line operation is detected by

the number of HSYNC* edges between VSYNC* edges. The frequency of operation (CCIR-601) for both PAL

and NTSC is detected by counting the number of clocks per line. The pixel rate is assumed to be 13.5 MHz, ±1

count and is between two successive falling edges of HSYNC*.

! BURST BLANKING

For NTSC, color burst information is automatically disabled on scan lines 1-9 and 264-272, inclusive(SMPTE line

numbering convention). For PAL-B, D, G, H, I, Nc color burst information is automatically disabled on scan

lines 1-6, 310-318, and 623-625, inclusive, for fields 1, 2, 5, and 6. During fields 3, 4, 7, and 8, color burst

information is disabled on scan lines 1-5, 311-319, and 622-625, inclusive.

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