Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
245 words
In a data processing system including a CPU, at least one external unit requiring data from or providing data to said CPU and an I/O bus for the transfer of said data between said CPU and external unit, said CPU comprising: means for executing a sequence of instructions including a first instruction; means connected to the executing means for transferring data to or from said external unit over said bus during synchronized CPU time cycles, means connected to the executing means for storing data in a plurality of registers within said CPU, means connected to the transferring means and storing means for internally transferring data within said CPU registers concurrently during the transfer of data to or from the external unit, and control means connected to the executing means, transferring means and storing means for controlling the transfer of data wherein the transfer of data between CPU registers coincides with the transfer of data to or from the external unit, said control means further including means for determining when data required for execution of a first of a sequence of instructions in said CPU has not been stored in one or more of the CPU registers as required by the first instruction and delaying the execution of the first instruction until such data is stored in the one or more registers while permitting the execution of other instructions of said sequence that do not require any data resulting from the execution of said first instruction.
Claim 2
Dependent Claim
245 words
In a data processing system including a CPU, at least one external unit requiring data from or providing data to said CPU and an I/O bus for the transfer of said data between said CPU and external unit, said CPU comprising: means for executing a sequence of instructions including a first instruction; means connected to the executing means for transferring data to or from said external unit over said bus during synchronized CPU time cycles, means connected to the executing means for storing data in a plurality of registers within said CPU, means connected to the transferring means and storing means for internally transferring data within said CPU registers concurrently during the transfer of data to or from the external unit, and control means connected to the executing means, transferring means and storing means for controlling the transfer of data wherein the transfer of data between CPU registers coincides with the transfer of data to or from the external unit, said control means further including means for determining when data required for execution of a first of a sequence of instructions in said CPU has not been stored in one or more of the CPU registers as required by the first instruction and delaying the execution of the first instruction until such data is stored in the one or more registers while permitting the execution of other instructions of said sequence that do not require any data resulting from the execution of said first instruction.
Claim 3
Dependent Claim
17 words
The data processing system of claim 1 wherein said external unit is an external data storage unit.
Claim 4
Dependent Claim
137 words
The data processing system of claim 2 wherein said control means includes means for generating data transfer commands to the external unit transfer means, means for assigning a register in said CPU storing means to which data is to be transferred, and means connected to said assigning means for storing a tag identifying said assigned register in a tag register in the control means, for comparing subsequent data transfer commands to the stored tags to determine if data for these subsequent data transfer commands includes data resulting from the external unit transfer command, for clearing said tag in the tag register when the external unit data transfer is complete, and for delaying the execution of any subsequent data transfer commands requiring data from the result of this external unit data transfer until the tag has been cleared.
Claim 5
Dependent Claim
46 words
The data processing system of claim 3 wherein said control means further includes means for cancelling a previous data transfer command in the event that a subsequent data transfer command assigns the same register assigned by the previous command before the previous command transfer is completed.
Claim 6
Dependent Claim
76 words
The data processing system of claim 4 wherein said storing means includes means for generating register to register transfer commands, and said control means further includes means for comparing said register to register transfer commands to said stored tags and for cancelling a previous data transfer command in the event that a subsequent register to register transfer command transfers data to the same register assigned by the previous command before the previous command transfer is completed.
Claim 7
Dependent Claim
31 words
The data processing system of claim 5 wherein said transfers to and from said external unit require a greater number of CPU time cycles than do said register to register transfers.