Digital data apparatus having a plurality of selecting...

Details Digital data apparatus having a plurality of selecting... Digital data apparatus having a plurality of selecting...

Category

G - Physics

Subcategory

06

Subsubcategory

F

CPC

354/233, 354/239

IPC codes

G06F 13/42 (2006.01) G06F 12/06 (2006.01)

Type

Patent

Patent number

CA 1193749

Description

- 24 - ABSTRACT: "Digital data apparatus with memory selection." Digital data apparatus comprising a processing unit which can have access to different numbers of memory units over a common data bus. The processing unit can address the memory units with select signals over individual leads of an address bus. Address codes containing select signals are valid when they select only a single memory unit. The validity of an address code is determined in the processing unit by comparing it with a corresponding iden- tification code read over the data bus from a memory unit addressed by the code. Because an address code containing more than one select signal may select more than one memory unit, each address code has associated with it a number of flag bits which signify how many select signals the address code contains, and the corresponding identification code includes these flag bits. When an address code selects more than one memory unit there will be conflict on the data bus between the address code portions of the read identification codes. However, the flag bit portions of these read identification codes are not in conflict and can be compared with the flag bits associated with the address code being used to determine whether or not this address code is valid. Figure 4 shows certain logic elements in the processing unit for the performance of the invention

Application Number

408438

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