8272
Description
Hand-shaking signals are provided in the 8272 which make DMA operation easy to incorporate with the aid of an external DMA controller chip, such as the 8237. The FDC will operate in either DMA or Non-DMA mode.
Key Features
- The relationship between the Status/Data registers and the signals /RD,/WR and A0 is shown below. A0 /RD /WR 0 0 0 1 1 0 FUNCTION Read Main Status Register Illegal 0 1 1 1 0 0 0 1 0 0 1 0 Illegal Illegal Read from Data Register Write into Data Register The bits in the Main Status Register are defined as follows: Bit Number DB0 Name Symbol
