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AM79C976 Datasheet(PDF) 295 Page - Advanced Micro Devices

Part # AM79C976
Description  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 Datasheet(HTML) 295 Page - Advanced Micro Devices

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8/01/00
Am79C976
A-10
P R E L I M INARY
)LJXUH$ /$33  %XIIHU*URXSLQJIRU7ZR,QWHUUXSW0HWKRG
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.
D-4



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