參數(shù)資料
型號: RX30000
英文描述: RX4000 Installation | User's Manual[10/2001]
中文描述: RX4000安裝|用戶手冊[10/2001]
文件頁數(shù): 47/111頁
文件大?。?/td> 391K
代理商: RX30000
User's Manual U13687EJ1V2UM
47
CHAPTER 6 REQUIRED MEMORY SPACE ESTIMATES
This chapter provides information to help you to estimate the total memory space required for the RX4000
management region (system memory region and user memory region).
6.1 OUTLINE
The RX4000 management region is divided into two regions: system memory and user memory.
System memory region
The system memory region consists of System Memory Pool. The management objects, the stack area for
tasks, and the stack area for interrupt handlers are allocated to this region.
User memory region
The user memory region consists of User Memory Pool, to which memory pools are allocated.
6.2 REQUIRED MEMORY SPACE CALCULATION FORMULAS
6.2.1 Management Objects
The formulas provided in this section are used to calculate the memory space (in units of bytes) required for the
management objects.
The whole management object area, which should be allocated to the system memory, is estimated as the sum
of the values calculated using these formulas.
System base table (SBT)
SBT_SIZ = align4(320 + align32(pri_lvl + 4)/8) + {(pri_lvl + 4) x 4)}
Remarks 1.
pri_lvl corresponds to the value assigned when you define the task priority range in the system
maximum value information as one of the RX4000 configuration settings.
SBT_SIZ corresponds to the memory size of the system base table (SBT).
2.
Task management block
TSK_SIZ = tsk_cntx 80
Remark
tsk_cntcorresponds to the value assigned when you define the maximum number of tasks that can
be created in the system maximum value information as one of the RX4000 configuration settings.
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