CPU vs DSP vs FPGA | Difference between CPU,DSP,FPGA
This page compares CPU vs DSP vs FPGA and describes difference between CPU,DSP and FPGA.
CPU-Central Processing Unit
The figure-1 depicts 8085 CPU architecture.
Refer CPU Architecture➤.
DSP-Digital Signal Processor
The figure-2 depicts DSP architecture.
Refer DSP Architecture➤.
FPGA-Field Programmable Gate Array
The figure-3 depicts FPGA Architecture.
Refer FPGA Architecture➤.
Following table-1 mentions difference between CPU and FPGA.
|Computation||Fixed arithmetic engines||User configurable logic|
|I/O||Fixed and dedicated I/O ports||User configurable I/O ports|
|Programmability||Program execution||Registers will determine modes and also defines operating parameters.|
|Ease of programming||C simplifies development tasks, not required to be worried about hardware.||HDL requires knowledge of hardware|
|Upgrades and maintenance||less difficult||more difficult|
|Complex algorithm implementation||Easy||Difficult|
|Peripherals||Equipped with peripherals with RS232, USB, Ethernet etc.||Significant HW and SW effort is needed to implement these on FPGA chip.|
|Appropriate tasks||• decision making
• complex analysis
• lower data rate computation
• block oriented tasks
|• compute intensive algorithms
• massively paralle operations
• high data rate computation
• streaming tasks
Following table-2 mentions difference between DSP and FPGA.
|Application as per sample rate||Standalone DSP chips provide cost effective solution at few KHz of sample rate.||FPGA is best suitable for sample rates are in few MHz.|
|Data rate||For low data rates extra cycles are available and hence DSP is not bandwidth limited.||FPGA is easier and efficient to implement when I/O rates are greater than few Mbytes/sec.|
|Data width/precision||No limitation if data width is same as bus width of processor. Moreover there is no room for bit growth in the DSP algorithms.||Suitable for high precision/high data width as it has uniform parallel structure.|
|Implementation of decision trees or conditional branches.||DSPs are ideal.||FPGAs are not suitable. These tasks can be done with the use of embedded cores or microBlaze.|
Refer our Page on what a microcontroller does.
Refer our Page on microcontroller programming using C language including example.
Refer our Page on microcontroller development kit manufacturers.
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