Tips for 5KK53

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Tips for 5KK53
Sun Wei
Silicon Hive
16-03-2006
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Outline

• 1. Directory structure
• 2. Synchronization
• 3. Cycle count

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Silicon Hive Sun Wei 16-03-2006
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Directory Structure

• 1. Silicon Hive Adalia release 20060222-2100
• 2. Main directory /home/hive/releases/20060222-210
  0
• 3. Examples /applications
• 4. Documents /doc/index.html
• 5. Executables /bin
• 6. Header files and libraries /include, /lib
• 7. Processor Cores Definition /cores -gt
• 8. Top Level Definition /systems -gt
• 9. Others /share, /eclipse

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Silicon Hive Sun Wei 16-03-2006
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Cores

• 1. avispa_demo_1
• a big VLIW DSP
• avispa is the name of some interesting insect,
  which probably can fly.
• 2. BasicMI
• 1 Logic slot 1 DSP slot 1 Master DTL
  interface 1 Slave DTL interface
• 3. BasicOnly
• BasicMI without Master DTL interface

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Silicon Hive Sun Wei 16-03-2006
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Systems

• avispa_demo_1, BasicMI, BasicOnly
• System with 1 Host and one processor, infinitive
  memory
• BasicMI_rtl
• BasicMI system with given memory
• Noc_jpeg
• 1 Host 3 BasicMI processors 1 external
  shared memory
• bus communication
• See sdk/include/.hsd for detailed system
  definition

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Silicon Hive Sun Wei 16-03-2006
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Synchronization

• For concurrent processors,
• We need synchronization.

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Silicon Hive Sun Wei 16-03-2006
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How to Synchronize

• 1. FIFO
• hardware implemented
• efficient
• fixed connection, inflexible
• 2. Software polling
• software poll a bit in shared memory
• less efficient
• flexible
• Software polling is employed in JPEG example
• More approaches are possible

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Silicon Hive Sun Wei 16-03-2006
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Code fraction from JPEG

• Wait for a semaphore
• while (idct_sem10) OP___schedule()
• Post a semaphore
• idct_sem11
• Take a semaphore
• Nothing need to do now
• Potential Risk
• Concurrent access to the semaphore
• Lock it or make access atomic

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Silicon Hive Sun Wei 16-03-2006
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Cycle count

• Evaluate the performance and gain from
• 1. sched\listing.gz
• what does the processor do in every cycle
• 2. sched\statistics.txt
• detailed cycles list
• 3. sched\html\.html
• summary in graphics

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Silicon Hive Sun Wei 16-03-2006
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Questions are welcome

• Questions are welcome
• Email wei.sun.0116_at_gmail.com
• Thanks

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Silicon Hive Sun Wei 16-03-2006