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1. 发明申请

WO9854643A3 TASK AND STACK MANAGER FOR DIGITAL VIDEO DECODING 审中-公开
标题翻译：用于数字视频解码的任务和堆栈管理器
公开(公告)号：WO9854643A3
公开(公告)日：1999-02-25
申请号：PCT/US9809138
申请日：1998-05-05
申请人： SONY ELECTRONICS INC
发明人： OZCELIK TANER , GADRE SHIRISH C
IPC分类号： G06F9/42 , G06F9/48 , G06F9/46
CPC分类号： G06F9/4812 , G06F9/4426 , G06F9/4881
摘要： A reduced instruction set CPU is programmed to provide software-controlled task management, a stack, and to manage virtual instruction memory. The CPU performs a task management procedure in which the CPU repeatedly checks task flags, and if a task flag is set, performs the task associated with the set task flag. If multiple task flags are set, the highest priority task of those associated with set task flags is performed. Whenever a subroutine call is needed, the subroutine call is implemented by calling a stack management routine. The stack management routine retrieves and stores a return address into a location in DRAM identified by a stack pointer, increments the stack pointer, and then executes a CALL instruction, causing program execution to sequence to the desired subroutine. At the end of each subroutine, a RETURN instruction is executed, in response to which, program execution returns to the stack management routine, and the stack management routine decrements the stack pointer, loads the previously-stored return address from a location in DRAM identified by the stack pointer register, and then causes program execution to sequence to the loaded return address. The stack management routine also provides virtual instruction memory management, by determining whether a routine is resident in the on-chip instruction memory available to the RISC CPU prior to calling or returning to the routine. If not, the virtual instruction memory management routine transfers the desired routine from off-chip DRAM into the on-chip instruction memory, and then executes the call or return.

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