IPT-C2H-NIOS Altera, IPT-C2H-NIOS Datasheet - Page 79

• Manufacturer Part Number: IPT-C2H-NIOS
• Description: C2H COMPILER FOR NIOS II
• Manufacturer: Altera
• Series: Nios®IIr
• Type: Nios IIr

Specifications of IPT-C2H-NIOS

• Function: C to Hardware Compiler
• License: Initial License
• Software Application: IP CORE, NIOS Processor And Functions
• Core Architecture: FPGA
• Core Sub-architecture: Cyclone
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Figure 3–18. Early Scheduling of Read Operation with Latency
Altera Corporation
November 2009
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:
■
■
■
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.
Inner loop
Subfunction call
Memory transfer
9.1
C-to-Hardware Mapping Reference
Nios II C2H Compiler User Guide
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