AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 295
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AM79C976
Manufacturer Part Number
AM79C976
Description
PCnet-PRO 10/100 Mbps PCI Ethernet Controller
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C976.pdf
(309 pages)
- Current page: 295 of 309
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8/01/00
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
#1
#2
#3
#4
#5
#6
#7
#8
#9
OWN = 1
SIZE = HEADER_SIZE (minimum 64 bytes)
OWN = 1
SIZE = S1+S2+S3+S4
OWN = 0
SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE)
OWN = 1
SIZE = HEADER_SIZE (minimum 64 bytes)
OWN = 1
SIZE = S1+S2+S3+S4
OWN = 0
SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE)
OWN = 1
SIZE = HEADER_SIZE (minimum 64 bytes)
OWN = 1
SIZE = S1+S2+S3+S4
OWN = 0
SIZE = 1518 - (S1+S2+S3+S4+HEADER_SIZE)
P R E L I M I N A R Y
STP = 0
STP = 0
STP = 1
STP = 0
STP = 0
STP = 1
STP = 0
STP = 0
Am79C976
STP = 1
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.
A = Expected message size in bytes
S1 = Interrupt latency
S2 = Application call latency
S3 = Time needed for driver to write
S4 = Time needed for driver to copy
S6 = Time needed for driver to copy
to third descriptor
data from buffer #1 to
application buffer space
data from buffer #2 to
application buffer space
A-10
D-4
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