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AM79C971VCW bảng dữ liệu(PDF) 246 Page - Advanced Micro Devices

tên linh kiện AM79C971VCW
Giải thích chi tiết về linh kiện  PCnet??FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
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D-10
Am79C971
Figure D4.
LAPP 3 Buffer Grouping for Two-interrupt Method
Note:
This document demonstrates a 3-buffer per packet implementation of LAPP. For PCnet-FAST application with external SRAMs
enabled, a 2-buffer per packet implementation can be used.
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.
19364D-D4



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