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AM79C978VC/W 数据表(PDF) 250 Page - Advanced Micro Devices

部件名 AM79C978VC/W
功能描述  Single-Chip 1/10 Mbps PCI Home Networking Controller
PDF  261 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C978VC/W 数据表(HTML) 250 Page - Advanced Micro Devices

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B-10
Am79C978
Figure B-4.
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.
22206B-B4



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