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YGV628B

Advanced Video Display Processor 7

Yamaha Corporation 

YGV628B

2) Clock

To AVDP7, a clock (dot clock) for a scan timing of monitor display, and for passing a display data, a clock (capture

clock) for capturing a digital image input, and a clock (system clock) which is used for other process are supplied

separately.

Please input a dot clock and a capture clock into GCK1IN pin and GCK2IN pin, and input a system clock into

SYCKIN pin.

Since there is no function of XTAL oscillation, be sure to input the clock which carried out the external oscillation.

● GCK1IN (Input Pin No.172)

● GCK2IN (Input Pin No.146)

- These are input pins of a dot clock and a capture clock.

- Be sure to input the 5MHz to 40MHz clock oscillated externally into these pins.

● SYCKIN (Input Pin No. 173)

- It is a system clock input pin. The reference clock for the built-in PLL is input.

- Be sure to input the 5MHz to 40MHz clock into SYCKIN.

● FILTER (Analog Pin No.176)

- It is the filter connection pin for built-in PLL used for a system clock oscillation.

- Please connect a resistor and a capacitor externally between PLLVSS pin and FILTER pin.

3) CPU Interface

● D15-0 (Input/Output Pin No. 39-42, 44, 45, 47-52, 54-57)

- It is a CPU data bus pin. It connects with an external data bus of CPU.

- Since these pins do not internally have a pull-up resistor, please make the pull-up outside of the device.

● A23-1(Input Pin No. 1-4, 6, 8-18, 21-27)

- It is a CPU address bus pin. It connects with an external address bus of CPU.

- Since these pins do not internally have a pull-up resistor, please make the pull-up outside of the device if

necessary.

● CS_N (Input Pin No.33)

- It is a chip select input pin.

- The chip select signals from CPU to register space or video memory space are input.

- Since this pin does not internally have a pull-up resistor, please make the pull-up outside of the device if

necessary.

- This signal is low active.

● RD_N (Input Pin No.30)

- It is a READ pulse input pin.

- The strobe signal for data read-out from CPU is input.

- Since this pin does not internally have a pull-up resistor, please make the pull-up outside of the device if

necessary.

- This signal is low active.

● WRH_N (Input Pin No.28)

● WRL_N (Input Pin No. 29)

- It is a WRITE pulse input pin. The strobe signal for data writing from CPU is input.

- Since these pins do not internally have a pull-up resistor, please make the pull-up outside of the device if

necessary.

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