| 摘要 |
<p>PURPOSE:To accomplish a high transfer rate by composing corresponding respective column outputs of a random access memory corresponding to respective steps of a shift register, and composing an input output device of plural bits to access in parallel plural columns corresponding to plural steps adjacent to the shift register. CONSTITUTION:A RAM composed of a 16K word X 4 bits is assembled with a serial shift register of 256 bits as a reading means. Data of a CPU data bus access simultaneously through an I/O1-I/O4 and the contents of RAM are transferred between shift registers and the shift register serially outputs data from a terminal SOUT with high speed by a shift clock SCLK. By such a composition, non-synchronously with a high speed reading by the shift register, a RAM side can access at randomly as an independent memory. Consequently, like a picture memory between CPU and a video display, the memory is used when a high speed serial data output and independent picture data processing from the output are necessary.</p> |
