YGV628B Datasheet, PDF (12/26 Pages) YAMAHA CORPORATION – AVDP7 Advanced Video Display Processor 7

YGV628B






- These signals are low active.
● WAIT_N (3-state Output Pin No.38)
- It is a CPU bus WAIT pin.
- The bus WAIT demand signal to CPU is output.
- Since this pin does not internally have a pull-up resistor, please make the pull-up outside of the device.
- This signal is low active.
● READY_N (3-state Output Pin No.37)
- It is a CPU bus READY pin.
- The bus READY signal to CPU is output.
- Since this pin does not internally have a pull-up resistor, please make the pull-up outside of the device.
- This signal is low active.
● INT_N (Output Pin No.36)
- It is an interrupt signal output pin.
- The interrupt request signal to CPU is output.
- This signal is low active.
● DREQ_N (Output Pin No.35)
- It is a DMA request signal output pin.
- The DMA request signal to CPU is output.
- This signal is low active.
4) Video Memory Interface
● SDQ15-0 (Input/Output Pin No. 59, 60, 62-66, 68, 70-73, 75-78)
- It is a data input/output bus pin for video memories.
- It connects with the data bus of a video memory.
- Since these pins do not internally have a pull-up resistor, please make the pull-up outside of the device.
● SA13-0 (Output Pin No. 89, 91-96, 98-100, 102-105)
- It is an address bus output pin for video memories.
- It connects with the address bus of a video memory.
- The signal attribute output from SA13-0 pin differs according to the kind of external SDRAM.
● SCS_N (Output Pin No.88)
- It is a tip select output pin for video memories.
- The tip select signal to a video memory is output.
- This signal is low active.
● RAS_N (Output Pin No.86)
- It is a low address strobe output pin for video memories.
- The low address strobe signal to a video memory is output.
- This signal is low active.
● CAS_N (Output Pin No.84)
- It is a column address strobe output pin for video memories.
- The column address strobe signal to a video memory is output.
- This signal is low active.
● WE_N (Output Pin No.82)
- It is a WRITE strobe output pin for video memories.
- The WRITE strobe signal to a video memory is output.
- This signal is low active.
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