Browse Prior Art Database

MIXED MEMORY CARD SIZE THROUGH ADDRESS GAP HANDLING

IP.com Disclosure Number: IPCOM000057096D
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14

Publishing Venue

IBM

Related People

Authors:
Borkenhagen, JM Finnes, SJ Geer, CP [+details]

Abstract

Different-sized main storage memory cards are handled by the use of an address formatter, a Primary Directory (PD), the use of a memory card which contains a Vital Product Data (VPD) RAM which can be accessed by the operating system and which contains data which uniquely defines the attributes of the memory card, and a configuration register which can be loaded by the operating system and used by the memory controller. All sizes and types of memory cards, which are supported by the memory controller, can be mixed in any order up to the maximum number of cards supported by the particular hardware implementation. All cards are treated as the same size and speed, and the configuration register is set for the largest card installed, and the memory timings are set so the slowest card will operate within its design limits.