PC circuits, systems and methods

• US 5,987,590 A
• Filed: 03/24/1997
• Issued: 11/16/1999
• Est. Priority Date: 04/02/1996
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Wing So, John Ling
• Primary Examiner(s): Pan, Daniel H.
• Application Number:
  US08/823,257
• Time in Patent Office: 967 Days
• Field of Search: 395/750.05, 395/290, 395/653, 395/652, 395/800.35, 395/500, 395/110, 395/685, 395/677, 395/670, 395/285, 395/182.08, 395/182.02, 340/310.8, 340/825.54, 340/510.02, 345/168, 345/1, 707/2, 707/3, 707/5, 712/35, 712/36, 709/212, 710/24, 710/39, 710/129
• US Class Current: 712/35
• CPC Class Codes: G06F 13/28 using burst mode transfer, e.g. direct memory access DMA, cycle steal G06F13/32 takes precedence
• CPC Class Codes: G06F 13/4018 with data-width conversion
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence
• CPC Class Codes: G06F 15/7864 on more than one IC chip
• CPC Class Codes: G06F 2209/509 Offload
• CPC Class Codes: G06F 9/3879 for non-native instruction execution, e.g. executing a command; for Java instruction set
• CPC Class Codes: G06F 9/50 Allocation of resources, e.g. of the central processing unit [CPU]
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes

Abstract

An improved PC system that includes a main CPU microprocessor, a file-based operating system, and a DSP microprocessor arranged so that the DSP can execute main CPU operations during time intervals in which the main CPU is otherwise occupied, thereby increasing the bandwidth of the system is provided. This PC system may include multiple CPUs and/or multiple DSPs.

Claims

1. A computing system, comprising:

a main CPU microprocessor;

a DSP microprocessor having a different instruction set from said main CPU microprocessor;

storage coupled to said main CPU microprocessor and said DSP microprocessor;

a file-based operating system in said storage, arranged so that the DSP executes main CPU operations during time intervals in which the main CPU is otherwise occupied, thereby increasing the performance of the system, said computing system capable of executing at least a software portion of a software application, said file-based operating system including software defining handles that tell where in virtual memory such software portion starts and ends;

a DSP kernel software defining operations to enable said DSP microprocessor to do a main CPU microprocessor function;

said main CPU microprocessor defining where the source handle and destination handle are;

said file-based operating system defining operations that send information to a location defined by a destination handle; and

said DSP kernel software defining operations based on where the source handle and destination handle are to enable said DSP microprocessor to execute a function in lieu of said main CPU microprocessor.

2. A computing system as claimed in claim 1 further comprising a video integrated circuit coupled to said DSP microprocessor and said main CPU microprocessor, said storage comprising disk and DRAM, said DRAM coupled in a unified memory architecture for said DSP microprocessor, said main CPU microprocessor, and said video integrated circuit.

3. A computing system as claimed in claim 1 further comprising at least one application apparatus to support an application of the system, said application apparatus including hardware reduced substantially to a physical layer only and coupled to said DSP microprocessor, so that said DSP microprocessor virtualizes and performs the rest of the application utilizing signals mediated by said physical layer.

4. A computing system as claimed in claim 1 further comprising kernel software in said storage for execution by said DSP microprocessor.

5. A computing system as claimed in claim 4 further having an I/O port coupled to said DSP microprocessor and wherein said kernel software defines DSP microprocessor operations cooperative with said file-based operating system wherein if said main CPU microprocessor is too occupied to execute a given function representing virtual hardware, said DSP microprocessor executes the function;

and if both said main CPU microprocessor and said DSP microprocessor are free, either of said main CPU microprocessor and said DSP microprocessor is selected to execute the function as determined by said file-based operating system, whereby virtual hardware has a mobility to sit on said main CPU microprocessor and on said I/O port.

6. A computing system as claimed in claim 4 wherein said kernel software defines DSP microprocessor operations on a preemptive basis with said file-based operating system wherein priorities for given functions are calculated in real-time and functions are dynamically executed, and said kernel software feeds said file-based operating system, whereby real-time priorities can be calculated.

7. A computing system as claimed in claim 1 wherein said file-based operating system includes software to provide said DSP microprocessor with pointer addresses to said storage for program space for said DSP microprocessor, and further for read data source space and write data destination space as a shared memory model for said main CPU microprocessor and said DSP microprocessor, whereby the arrangement tightly couples the DSP microprocessor to the main CPU microprocessor using the file-based operating system.

8. A computing system as claimed in claim 1 wherein said main CPU microprocessor utilizes virtual addresses and said file-based operating system includes a virtual memory manager to provide physical addresses corresponding to the virtual addresses, and the computing system further comprises a DSP kernel defining operations to utilize the physical addresses for DSP microprocessor functions.

9. A computing system as claimed in claim 1 wherein said file-based operating system includes software defining virtual device drivers (VXD) to communicate with applications through a callback function for 16-bit applications and through a semaphore for 32-bit applications.

10. A computing system as claimed in claim 1 wherein said file-based operating system defines operations that virtualize an interrupt used to communicate between said DSP microprocessor and said main CPU microprocessor.

11. A process for operating a computer system that has a main CPU microprocessor, a DSP microprocessor having a different instruction set from said main CPU microprocessor, and storage coupled to said main CPU microprocessor and said DSP microprocessor, an I/O port coupled to the DSP microprocessor, the process comprising:

running a file-based operating system on the main CPU microprocessor;

executing main CPU operations in the DSP using a shared-file memory model during time intervals in which the main CPU is otherwise occupied;

running DSP microprocessor operations cooperating with operations of the file-based operating system wherein if the main CPU microprocessor is too occupied to execute a given function representing virtual hardware, the DSP microprocessor executes the function; and

if both the main CPU microprocessor and DSP microprocessor are free, using the file-based operating system to determine which of either of the main CPU microprocessor and the DSP microprocessor shall do the function, whereby virtual hardware has a mobility to sit on the main CPU microprocessor and on the I/O port.

12. A process as claimed in claim 11 further comprising:

running DSP kernel software on the DSP microprocessor concurrently with said running step on the main CPU to coordinate their operations.

13. A process as claimed in claim 11 further comprising:

providing at least one application apparatus to support an application of the system, said application apparatus including hardware reduced substantially to a physical layer only; and

virtualizing the rest of the application utilizing signals mediated by said physical layer.

14. A process as claimed in claim 11 further comprising:

running a DSP kernel to feed said file-based operating system with information about operations of the DSP microprocessor; and

calculating priorities for given functions of the system in real-time and dynamically executing the functions, based on the information fed to the operating system.

15. A process as claimed in claim 11 further comprising:

running the file-based operating system to provide the DSP microprocessor with pointer addresses to storage for program space for the DSP microprocessor, and further for read data source space and write data destination space as a shared memory model for the main CPU microprocessor and the DSP microprocessor,

whereby the arrangement tightly couples the DSP microprocessor and the main CPU microprocessor using the file-based operating system.

16. A process as claimed in claim 11 further comprising:

defining handles, with the file-based operating system running on the main CPU microprocessor, that tell where in virtual memory space that software portions start and end; and

using DSP kernel software to enable the DSP microprocessor to do a function in lieu of the main CPU microprocessor based on where the source handle and destination handle are.

17. A process as claimed in claim 11 wherein the main CPU microprocessor utilizes virtual addresses, the process further comprising:

running a virtual memory manager to provide physical addresses corresponding to the virtual addresses; and

utilizing the physical addresses for functions run on the DSP microprocessor.

18. A process as claimed in claim 11 further comprising:

running a virtual device driver (VXD) on the main microprocessor and a DSP kernel on the DSP microprocessor to communicate with software applications of 16-bit and 32-bit types through a callback function for 16-bit software applications and through a semaphore for 32-bit software applications running on the DSP microprocessor.

19. A process as claimed in claim 11 further comprising:

virtualizing an interrupt to communicate between the DSP microprocessor and the main CPU microprocessor.

20. A computing system comprising:

a main CPU microprocessor;

storage coupled to said main CPU microprocessor;

a DSP microprocessor having a different instruction set from said main CPU microprocessor coupled to said storage;

a file-based operating system and at least one application program in said storage, arranged so that the DSP executes main CPU operations in the DSP using a shared-file memory model during time intervals in which the main CPU is otherwise occupied;

a video integrated circuit coupled to said DSP microprocessor and said main CPU microprocessor;

said computing system capable of executing at least a software portion of a software application;

said file-based operating system including software defining handles that tell where in virtual memory such software portion starts and ends;

a DSP kernel software defining operations to enable said DSP microprocessor to do a main CPU microprocessor function;

said main CPU microprocessor defining where the source handle and destination handle are;

said file-based operating system defining operations that send information to a location defined by a destination handle; and

said DSP kernel software defining operations based on where the source handle and destination handle are to enable said DSP microprocessor to execute a function in lieu of said main CPU microprocessor.

21. The computing system of claim 20 further comprising a main bus, and wherein said video integrated circuit is coupled to said DSP microprocessor via a video private bus and coupled to said main CPU microprocessor via said main bus, said DSP microprocessor also coupled to said main CPU microprocessor via said main bus.

22. The computing system of claim 20 further comprising at least one physical layer I/O interface coupled to said DSP microprocessor.

23. A computing system, comprising:

a main CPU microprocessor;

a DSP microprocessor having a different instruction set from said main CPU microprocessor;

an I/O port coupled to said DSP microprocessor;

storage coupled to said main CPU microprocessor and said DSP microprocessor, said storage storing kernel software for execution by said DSP microprocessor;

a file-based operating system in said storage, arranged so that the DSP executes main CPU operations during time intervals in which the main CPU is otherwise occupied, thereby increasing the performance of the system;

a kernel software for executing by said DSP microprocessor defining DSP microprocessor operations cooperative with said file-based operating system wherein if said main CPU microprocessor is too occupied to execute a given function representing virtual hardware, said DSP microprocessor executes the function; and

if both said main CPU microprocessor and said DSP microprocessor are free, either of said main CPU microprocessor and said DSP microprocessor is selected to execute the function as determined by the file-based operating system, whereby virtual hardware has a mobility to sit on the CPU and on said I/O port.

24. A process for operating a computer system that has a main CPU microprocessor, a DSP microprocessor having a different instruction set from said main CPU microprocessor, and storage coupled to said main CPU microprocessor and said DSP microprocessor, the process comprising:

running a file-based operating system on the main CPU microprocessor;

executing main CPU operations in the DSP using a shared-file memory model during time intervals in which the main CPU is otherwise occupied;

executing at least a software portion of a software application;

defining handles that tell where in virtual memory such software portion starts and ends via said file-based operating system;

defining operations to enable said DSP microprocessor to do a main CPU microprocessor function via a DSP kernel software;

defining where the source handle and destination handle are via said main CPU microprocessor;

defining operations that send information to a location defined by a destination handle via said file-based operating system via said file-based operating system; and

defining operations based on where the source handle and destination handle are to enable said DSP microprocessor to execute a function in lieu of said main CPU microprocessor via said DSP kernel software.

25. A computing system comprising:

a main CPU microprocessor;

storage coupled to said main CPU microprocessor, said storage storing kernel software for execution by said DSP microprocessor;

a DSP microprocessor having a different instruction set from said main CPU microprocessor coupled to said storage;

an I/O port coupled to said DSP microprocessor;

a file-based operating system and at least one application program in said storage, arranged so that the DSP executes main CPU operations in the DSP using a shared-file memory model during time intervals in which the main CPU is otherwise occupied;

a kernel software for execution by said DSP microprocessor defining DSP microprocessor operations cooperative with said file-based operating system wherein if said main CPU microprocessor is too occupied to execute a given function representing virtual hardware, said DSP microprocessor executes the function; and

if both said main CPU microprocessor and said DSP microprocessor are free, either of said main CPU microprocessor and said DSP microprocessor is selected to execute the function as determined by the file-based operating system, whereby virtual hardware has a mobility to sit on said main CPU microprocessor and on said I/O port; and

a video integrated circuit coupled to said DSP microprocessor and said main CPU microprocessor.