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): 49/111頁
文件大?。?/td> 391K
代理商: RX30000
CHAPTER 6 REQUIRED MEMORY SPACE ESTIMATES
User's Manual U13687EJ1V2UM
49
6.2.2 Stack Area for Tasks
The formula of calculating the memory space (in units of bytes) required for the stack area per task is given
below.
The entire stack area for tasks, which should be allocated to the system memory, is estimated as the sum of the
stack areas for all tasks, each of which is calculated by using the following formula:
STK_SIZ = align4(stk_siz+ 108)
Caution
The 108 bytes shown in the above formula correspond to the task context size plus the stack
management table size. Therefore, stk_sizmust include the size of the register in which data
is saved in the event of an interrupt. The frame size of the register in which data is saved if an
OS interrupt occurs is 80 bytes.
stk_sizcorresponds to the value assigned when you define the stack data for a task in the task
information, or the value assigned when you define the stack size as the task generation data
at cre_tsksystem call issue.
6.2.3 Stack Area for Interrupt Handlers
The following formula should be used to calculate the memory space (in units of bytes) required for the stack
area for interrupt handlers:
INTSTK_SIZ = align4(intstk_siz)
Caution
intstk_sizcorresponds to the value assigned when you define the stack data for interrupt
handler in the system information as one of the RX4000 configuration settings.
6.2.4 Memory Pools
The formula of calculating the memory space (in units of bytes) required for each memory pool is given below.
The entire memory pool area, which should be allocated to the user memory, is estimated as the sum of the
memory pool areas, each of which is calculated by using the following formula:
MPL_SIZ = align4(mpl_siz)
Caution
mpl_sizcorresponds to the value assigned when you define the memory pool information as
one of the RX4000 configuration settings, or the value assigned when you define the memory
pool size in the memory pool information at cre_mpl system call issue.
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