IPTR-C2H-NIOS Altera, IPTR-C2H-NIOS Datasheet - Page 108
IPTR-C2H-NIOS
Manufacturer Part Number
IPTR-C2H-NIOS
Description
IP CORE Renewal Of IPT-C2H-NIOS
Manufacturer
Altera
Datasheet
1.IPT-C2H-NIOS.pdf
(138 pages)
Specifications of IPTR-C2H-NIOS
Software Application
IP CORE, NIOS Processor And Functions
Core Architecture
Nios II
Features
ANSI C Compliance, Straightforward C-to-Hardware Mapping, Reporting Of Generated Results
Core Sub-architecture
Cyclone
Rohs Compliant
NA
Lead Free Status / RoHS Status
na
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Performance
Figure 4–6. CRC Critical Path Scheduling by Assignment
4–14
Nios II C2H Compiler User Guide
Iteration
Loop
0
1
2
Time
13:lut_addr=((crc&0xFF)^
0
State(0
2
*data++;
6)
4
soon as the previous execution is complete. Not surprisingly, the critical
path statement is what limits the speed of the loop, and hence what
determines CPLI.
Notice, also, that line 13 (lut_addr = (crc & 0xFF) ^ *data++)
appears to take more clock cycles than line 14 (crc = (crc >> 8) ^
table[lut_addr]). The C2H Compiler “stretches out” the calculation
of lut_addr so that it is available exactly when it is needed. The memory
access in line 14 is nonetheless the limiting operation.
Scheduling Information
There are two ways of presenting the loop scheduling information: per
assignment, and per state.
13:lut_addr=((crc&0xFF)^
6
14:crc=((crc>>8)^
table[lut_addr];
State(6
State(0
8
*data++;
11)
10
6)
9.1
13:lut_addr=((crc&0xFF)^
12
14:crc=((crc>>8)^
table[lut_addr];
State(6
14
State(0
*data++;
11)
16
6)
13:lut_addr=((crc&0xFF)^
18
14:crc=((crc>>8)^
table[lut_addr];
State(6
State(0
20
*data++;
Altera Corporation
11)
November 2009
6)
22
24
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