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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C971VCW датащи(PDF) 246 Page - Advanced Micro Devices |
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AM79C971VCW датащи(HTML) 246 Page - Advanced Micro Devices |
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246 / 265 page  D-10 Am79C971 Figure D4. LAPP 3 Buffer Grouping for Two-interrupt Method Note: This document demonstrates a 3-buffer per packet implementation of LAPP. For PCnet-FAST application with external SRAMs enabled, a 2-buffer per packet implementation can be used. Descriptor #1 Descriptor #2 Descriptor #3 Descriptor #4 Descriptor #5 Descriptor #6 Descriptor #7 Descriptor #8 Descriptor #9 OWN = 1 STP = 1 SIZE = HEADER_SIZE (minimum 64 bytes) OWN = 1 STP = 0 SIZE = S1+S2+S3+S4 OWN = 0 STP = 0 SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE) OWN = 1 STP = 1 SIZE = HEADER_SIZE (minimum 64 bytes) OWN = 1 STP = 0 SIZE = S1+S2+S3+S4 OWN = 0 STP = 0 SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE) OWN = 1 STP = 1 SIZE = HEADER_SIZE (minimum 64 bytes) OWN = 1 STP = 0 SIZE = S1+S2+S3+S4 OWN = 0 STP = 0 SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE) A = Expected message size in bytes S1 = Interrupt latency S2 = Application call latency S3 = Time needed for driver to write to third descriptor S4 = Time needed for driver to copy data from buffer #1 to application buffer space S6 = Time needed for driver to copy data from buffer #2 to application buffer space Note that the times needed for tasks S1, S2, S3, S4, and S6 should be divided by 0.8 microseconds to yield an equivalent number of network byte times before subtracting these quantities from the expected message size A. 19364D-D4 |
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