am79c961a Advanced Micro Devices, am79c961a Datasheet - Page 199
am79c961a
Manufacturer Part Number
am79c961a
Description
Pcnet?-isa Ii Jumperless, Full Duplex Single-chip Ethernet Controller For Isa
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C961A.pdf
(206 pages)
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Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
#1
#2
#3
#4
#5
#6
#7
#8
#9
Figure 4.
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)
LAPP 3 Buffer Grouping for TWO-INTERRUPT Method
STP = 0
STP = 0
STP = 1
STP = 0
STP = 0
STP = 1
STP = 0
STP = 0
Am79C961A
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
19364B-90
199
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