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A high speed bus structure and data transfer method to provide data transfer capability between a central processing device and a plurality of electrical modules coupled to the bus. In the preferred embodiment, a central processing unit is coupled to a plurality of electrical modules for data recept

A high speed bus structure and data transfer method to provide data transfer capability between a central processing device and a plurality of electrical modules coupled to the bus. In the preferred embodiment, a central processing unit is coupled to a plurality of electrical modules for data reception and transmission. In a module “listen”cycle, the central processor (CP) device generates a function code which is transmitted on a command bus coupled to each electrical module. The CP device asserts data required by the particular module function on the data bus coupled to each electrical module. The CP device transmits an enable signal (ES) on an enable bus to enable the particular electrical module which is to receive data and asserts a clock signal on a clock line coupled to each module. The enabled electrical module receives valid data from the CP device upon sensing a deasserted clock line denoting the end of a clock cycle. In a module “talk”cycle, an enabled electrical module transmits data to the CP device after transmitting a service request (SRQ) signal to the awaiting CP device which has previously requested a data transmission. Upon receiving the SRQ signal, the CP device asserts an appropriate function code and clock signal. The transmitting module provides its data on the data bus which is received by the CP device as valid data once the clock line is deasserted. Other features include independent module to module communication and a power up bus poll routine for module-slot identification.

대표청구항 ▼

A system for high speed, address independent data and command transferral between a computer and a plurality of instrument modules, comprising: a high speed bus comprised of a plurality of multipurpose lines and buses; a data bus and a command bus in said high speed bus coupled to said computer and

A system for high speed, address independent data and command transferral between a computer and a plurality of instrument modules, comprising: a high speed bus comprised of a plurality of multipurpose lines and buses; a data bus and a command bus in said high speed bus coupled to said computer and to each of said instrument modules; a module polling means coupled to said computer wherein, after power up of said computer, said polling means sequentially polls each of said instrument modules by issuing a model identification number on said command bus to which each of said instrument modules may be coupled; a data transmission and reception means respectively coupled to said computer, to said data bus, to said command bus and to each of said instrument modules for transmitting and receiving data over said data bus and said command bus in accordance with a desired instrument operation defined by a function code; a first storage means in each of said instrument modules for storing instrument means identification numbers, wherein said data transmission and reception means transmits said module identification number to said computer upon receipt of said model identification number by said reception means; a second storage means in said computer for storing said instrument module identification number received from said instrument modules in a poll table wherein said poll table associates an address slot in said poll table with said identified module thereby allowing any module to be associated with any slot; function code generation means coupled to said computer for generating a function code (#0 . . . N) corresponding to a desired instrument operation and transmitting to said instrument modules said code on said command bus; a plurality of enable lines coupled to said computer and each of said instrument modules; module enabling means coupled to said computer and each of said enabling lines for sequentially generating an enable signal and transmitting said enable signal on an enable line connected to a selected instrument module, such that said selected instrument module is enabled for data transfer and function code reception; a function code receiving means coupled to each of said instrument modules, said enable line and said command bus for decoding said function code provided to said enabled instrument module into a unique operation for execution by said instrument module on receipt of said enable signal; whereby a high speed data transfer occurs as a result of associating said instrument identification number in said poll table with an associated address slot and an associated function code such that said instrument modules can be coupled to any slot. A method for transferring data and commands at high speed between a computer and a plurality of instrument modules comprising the steps of: said computer, upon power-up, sequentially generating model identification code signals to each of said instrument modules; said instrument module transmitting an instrument module identification number onto a data bus coupled to said computer and each of said instrument modules; said computer storing said instrument module identification number received from each of said instrument modules in a poll table; said computer associating an address slot in said poll table with each of said module identification numbers; said computer generating a digital function code (#0 . . . N) corresponding to a desired instrument operation and transmitting said function code on a command bus coupled to said computer and to each of said instrument modules; said computer generating a module enable signal and transmitting said signal on one of a plurality of enable lines coupled to said computer and to each of said instrument modules such that said selected instrument module is enabled for data transfer and function code reception; said enabled instrument module decoding said function code into a unique operation to be executed by said instrument module upon receipt of said enabled signal; said enabled instrument module transmitting and receiving data on a data bus coupled to said computer and to each of said instrument modules in accordance with a desired instrument operation defined by said function code; whereby said enabled instrument module executes said desired operation corresponding to said function code and associates said instrument module with an address slot such that said instrument module can be coupled to any slot.