| 摘要 |
<p>PURPOSE: To prevent the delay time from increasing by setting the number of memory blocks in a memory array sectioned into a plurality of memory blocks having a parity bit equal to a multiple of 3 thereby making uniform the number of bits constituting a memory block even if the organization of I/O bits of the memory array is switched. CONSTITUTION: In a semiconductor memory chip 10, a memory array is divided into six memory blocks 100 each of which is subdivided into eight memory mats. The chip 10 is divided by a multiple of 3, i.e., 6, and the number of I/O to be served by each memory block can be divided uniformly into 12, 6 and 3 bits, respectively, for each organization of×72,×36 and×18 bits added with a parity bit. A peripheral circuit 2000 is provided in the center of the chip 10 in order to prevent the signal propagation delay from increasing. With such constitution, a fast semiconductor memory of variable bit constitution having a parity bit can be obtained without increasing the wiring delay time.</p> |
