| 摘要 |
<p>PURPOSE:To easily cope with the display of a large size, for example, by extracting data in parallel individually from plural parallel data registers so as to allow a selector to connect the data registers serially and extracting the data selectively. CONSTITUTION:A data selector consists of addresses A8, A9 added by high-order 2-bit to serial address buffers A0-A7 and a decoder and a selector section operated by decoding the added addresses. Then a control signal is fed selectively to gates of transfer gates 1, 2, 3, 4. Thus, the data is extracted in parallel individually from the plural parallel data registers in a video memory or the like and the connection of the data registers serially to extract a data, which are selected. That is, four sets of 256-bit serial registers and a 1,024-bit register are changed over and the circuit copes easily with a large sized display.</p> |
