参数资料
型号: IPT-C2H-NIOS
厂商: Altera
文件页数: 79/138页
文件大小: 0K
描述: C2H COMPILER FOR NIOS II
标准包装: 1
系列: Nios®II
类型: Nios II
功能: C 到硬件编译器
许可证: 初始许可证
C-to-Hardware Mapping Reference
Figure 3–18. Early Scheduling of Read Operation with Latency
The C2H Compiler optimizes the dependency graph for this function by
moving the read operation for ptr_in up to state 0. This optimization
allows the calculation of xy and xy_plus_z to occur during the two
cycles of latency required to fetch data for ptr_in .
Stalling
A state machine stalls when data needed for an operation is not available.
A state machine might stall while waiting for one or more of the following
actions to complete:
Inner loop
Subfunction call
Memory transfer
The state machine does not proceed until all reasons for stalling are
resolved.
Inner Loops
Each loop is implemented as a state machine, and an inner loop translates
to a particular state within the state machine for its containing function or
outer loop. In other words, an inner loop translates to a state machine
within a state machine. As the state machine for an inner loop executes,
the outer state machine stalls until the inner loop has completed.
Altera Corporation
November 2009
9.1
3–39
Nios II C2H Compiler User Guide
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