AM79C850KCW AMD [Advanced Micro Devices], AM79C850KCW Datasheet - Page 56
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AM79C850KCW
Manufacturer Part Number
AM79C850KCW
Description
SUPERNET-R 3
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79C850KCW.pdf
(97 pages)
- Current page: 56 of 97
- Download datasheet (346Kb)
Mask Registers (AFMASK2:0)
The mask registers are 16-bit registers that may be read
and written by the node processor. AFMASK0 corre-
sponds to bits 15:0 of the CAM mask entry. AFMASK1
corresponds to bits 31:16 of the CAM mask entry.
AFMASK2 corresponds to bits 47:32 of the CAM mask
entry. A “1” written to a bit position in the mask register
will enable the corresponding bit in the comparand to
participate in the comparison operation. A “0” written to
56
MSB
AMD
15
14
13
Figure 22. Node Processor Comparand Register (AFCOMP0)
12
11
10
P R E L I M I N A R Y
9
SUPERNET 3
8
7
a bit in the mask register will disable, or mask, the
corresponding bit in the comparand. A bit that is masked
will always match the corresponding bit in a comparison
operation. This register will be cleared (filled with
zeroes) on a reset and will retain its data after each time
it is written until the next reset. This register will be
updated with the contents of the first matching entry in
the CAM if a “Read CAM” instruction is issued to the
command register while the FOUND bit is set.
6
5
4
3
2
1
0
AFCOMP(10)
AFCOMP(11)
AFCOMP(12)
AFCOMP(13)
AFCOMP(14)
AFCOMP(15)
AFCOMP(0)
AFCOMP(1)
AFCOMP(2)
AFCOMP(3)
AFCOMP(4)
AFCOMP(5)
AFCOMP(6)
AFCOMP(7)
AFCOMP(8)
AFCOMP(9)
LSB
19574A-23
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