Device for simultaneous data input/output and execution support in digital processors

A device for use with a digital processor for providing data input/output transfers simultaneously with execution support in said digital processor, wherein said execution support includes program execution support for directly transferring data between an external device and an execution unit of a digital processor and Z delay execution support, said device comprising:

• a plurality of input/output interfaces, each of said plurality of input/output interfaces being independently and simultaneously couplable to a different data source, said plurality of input/output interfaces provided a plurality of input/output ports, each of said input/output interfaces being individually controllable, each of said plurality of input/output ports being capable of inputting and/or outputting data simultaneously in time with program execution in said digital processor, said plurality of input/output interfaces including an interface to said execution unit of said digital processor for direct program execution support;
• at least one of said plurality of data input/output interfaces being selected from the group consisting of host central processing unit input and output interfaces, a serial input and output interface, and external memory input and output interfaces;
• a data cache memory, said memory being selectively coupled to said plurality of input/output interfaces and having at least two ports, a first one of said ports being employed only for said data input/output transfers, and a second one of said ports being employed for said data input/output transfers, said direct execution support and said Z delay execution support;
• means comprising a plurality of internal busses for coupling said plurality of input and output interfaces, said data cache memory, and said digital processor, said means for coupling providing for said interfaces, said memory, and said digital processor to receive data directly from or output data directly to any other one of said plurality of input/output interfaces, said memory, or said digital processor;
• said plurality of input/output interfaces, said data cache memory, and said digital processor being directly connected to at least one of said busses;
• means for controlling said plurality of input and output interfaces, said data cache memory, and said digital processor for effecting data transfer between any of said plurality of input/output interfaces, said memory, or said digital processor attached to a first of said plurality of internal busses while simultaneously effecting a transfer between any other of said plurality of input/output interfaces, said memory, or said digital processor which are attached to a second of said plurality of said internal busses, so that data transfer may be effected simultaneously with program execution in said digital processor,
• said means for controlling comprising means for prioritizing data transfer requests, and said means for controlling operating in the absence of signals originating external to said device.

In a data processor, a novel memory circuit for implementing Z delay operation, said circuit comprising:

• a data cache memory having at least two ports;
• a means for storing Z data;
• a means for storing Z addresses;
• a first address means for inputting addresses into a first port of said cache memory or said means for storing Z addresses from a first source of address pointers;
• a second address means for inputting addresses into a second port of said cache memory from said means for storing Z addresses or a source of external memory addresses;
• a first means for inputting and outputting data from said first port of said cache memory in response to said first address means;
• and
• a second means for inputting and outputting data from said second port of said cache memory in response to said second address means;
• wherein said first one of said ports outputs an operand for said Z delay operation, and said second one of said ports receives as an input a result of said Z delay operation thereby allowing for the simultaneous calculation of a y(i) filter result based on the formula y(i)=C(k)*x(i), while allowing for the shifting of x(i) samples in memory in preparation of calculating a y(i+1) next result.

A device for simultaneous data input and output and execution support in digital processors, wherein said execution support includes program execution support and Z delay execution support, said device comprising:

• a plurality of input/output interfaces for providing a plurality of controllable input/output ports for inputting and outputting data, each of said plurality of input/output interfaces being individually controllable and operable without control signals from sources external to said device;
• a plurality of internal busses;
• a data cache memory selectively couplable to each of said plurality of input/output interfaces via at least one of said plurality of busses, said data cache memory further comprising:
• at least two ports, a first one of said ports being employed for said data input and output, and a second one of said ports being employed for said data input and output and said execution support;
• a means for storing data;
• a means for storing addresses;
• a first address means for inputting addresses into said first port of said data cache memory or said means for storing addresses from a first source of address pointers;
• a second address means for inputting addresses into said second port of said data cache memory from said means for storing addresses or a source of external memory addresses;
• one of said busses comprising a first means for inputting and outputting data from said first port of said data cache memory;
• and
• another of said busses comprising a second means for inputting and outputting data from said second port of said data cache memory;
• and a means for controlling said plurality of input/output interfaces and said data cache memory for effecting a transfer of said data between any of said plurality of input/output devices or said data cache memory;
• whereby data transfer is via at least one of said plurality of internal busses and is effected simultaneously with program execution in a digital processor;
• said means for storing data further comprising:
• a first data storage means for storing said data at an address defined by said first or second address means;
• a second data storage means for storing data outputted from said first means for inputting and outputting data;
• a third data storage means for storing said data from said second data storage means, an output of said third data storage means being a selectable input to said second port of the data cache memory;
• and said means for storing addresses further comprising:
• a first address storage means for storing said address pointers;
• a second address storage means coupled to said first address storage means for storing said addresses from said first address storage means;
• whereby said storage of data from said second data storage means constitutes an intermediate step in said Z delay execution support, the first step including said storage of data outputted from said first means for inputting and outputting data;
• and said first and second address storage means cooperate to retain during the process of said Z delay execution support the address of said data stored in said second and said third data storage means;
• the final step in said Z delay execution support including selection of said data stored in said third data storage means and said address stored in said second address storage means for writing to said second port of the data cache memory, it being possible for said writing to be simultaneous with said data input and output at said first port of the data cache memory.