SPCA701A 查看數據表（PDF） - Unspecified

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SPCA701A

DIGITAL VIDEO ENCODER FOR VIDEOCD

Unspecified 

Preliminary

SPCA701A

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 262/525 line and 312/625 line,

respectively.

SLAVE MODE

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

CLOCK. The horizontal counter is incremented on the rising edge of 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 MODE[3:2] bits when the SETMODE (MASTER

pin) bit is set high. Alternatively, when SETMODE is low, the mode is automatically detected in 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 which is detected in

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 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.

Sunplus Technology Co., Ltd.

6

Rev.: 0.2 1999.12.07

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