| 摘要 |
The present invention provides a method for temporarily storing and retrieving 8-bit character information data for a magnetic disk information storage system in a number of 4xn DRAM buffer memory configurations, characterised by the steps of: providing a virtual memory address for each item of 8-bit character information data, said character information data being organised into a 16-byte block, translating the virtual memory addresses into corresponding addresses of memory locations in said 4xn buffer memory for storage of 4-bit groups of said 16-byte block in said 4xn DRAM buffer memory, said translating step including: selecting a row address for storage of said 16-byte block, selecting a base column address for said 16-byte block, and successively incrementing said base column address to provide additional column addresses for successive 4-bit groups of said 16-byte block, and transferring each of said 4-bit groups of said 16-byte block through a 4-bit data bus to the various pre-determined address locations in one of said 4xn DRAM buffer memory configurations determined by said translating step. In addition, and 8-bit parity word for the 16-byte block is stored in a separate part of the DRAM buffer memory. <IMAGE> |
