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DP83821 bảng dữ liệu(PDF) 64 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83821
Giải thích chi tiết về linh kiện  10/100/1000 Mb/s PCI Ethernet Network Interface Controller
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP83821 bảng dữ liệu(HTML) 64 Page - National Semiconductor (TI)

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4.0 Register Set (Continued)
4.2.26 Management Information Base Control Register
The MIBC register is used to control access to the statistics block and the warning bits and to control the collection of
management information statistics.
Tag: MIBC
Size: 32 bits
Hard Reset: 00000002h
Offset: 005ch
Access: Read Write
Soft Reset: 00000002h
bit
tag
description
usage
31-4
unused
3
MIBS
MIB Counter Strobe
Writing a 1 to this bit location causes the counters in all enabled blocks to
increment by 1, providing a single-step test function. The MIBS bit is
always read back as 0. This bit is used for test purposes only and
should be set to 0 for normal counter operation.
2
ACLR
Clear all counters
When set to a 1, this bit forces all counters to be reset to 0. This bit is
always read back as 0.
1
FRZ
Freeze all counters
When set to a 1, this bit forces count values to be frozen such that a read of
the statistic block will represent management statistics at a given instant in
time. When set to 0, the counters will increment normally and may be read
individually while counting.
0
WRN
Warning Test Indicator
This field is read only. This bit is set to 1 when all statistic counters have
reached their respective overflow warning condition. WRN will be cleared
after one or more of the statistic counters have been cleared.



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