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AM79C975VCW датащи(PDF) 293 Page - Advanced Micro Devices

номер детали AM79C975VCW
подробное описание детали  PCnet??FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
PDF  304 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C975VCW датащи(HTML) 293 Page - Advanced Micro Devices

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Am79C973/Am79C975
293
P R E L I M INARY
Figure 91. LAPP 3 Buffer Grouping for Two-interrupt Method
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.
21510B-B4



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