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參數資料
| 型號： | AM79C850KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SUPERNET-R 3 |
| 中文描述： | 1 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP208 |
| 封裝： | PLASTIC, QFP-208 |
| 文件頁數： | 53/97頁 |
| 文件大小： | 358K |
| 代理商： | AM79C850KCW |
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P R E L I M I N A R Y
AMD
53
SUPERNET 3
Status Register (AFSTAT)
The status register is a 16-bit register that may be read
and written through the node processor interface. This
register contains the status of the AF. All bits of the
status register are static; they are not cleared after a
read operation.
LSB
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
19574A-20
RESERVED
RESERVED
REV. NUMBER 0
REV. NUMBER 1
REV. NUMBER 2
BISTDONE
EMPTY
ERROR
MULT
EXACT
FOUND
FULL
DONE
RESERVED
RESERVED
RESERVED
Reserved bits are read as zero unless otherwise stated.
Figure 19. Status Register
DONE (bit 15)
Done Indicator
The DONE bit indicates to the node processor that the
AF is finished performing a previously commanded
operation. The node processor must not issue any
command to the AF when this bit is not set. This bit may
be used to generate an interrupt to the node processor
indicating the completion of an operation.
FULL (bit 14)
CAM Full
This bit indicates the state of the CAM array. When this
bit is set, there are no invalid CAM entries, i.e., all CAM
entries have their VALID bit set. When this is reset, there
is at least one invalid entry in the CAM. If this bit is set,
the AF should not be commanded to “Write CAM.” If that
instruction is issued when this bit is set, the operation
will not be performed.
Note:
The ERROR bit in the status register will not be
set if a “Write CAM” instruction is issued when this bit is
set. The user has to read this bit status before attempt-
ing to write an entry into the CAM.
FOUND (bit 13)
Comparand Found in CAM
This bit indicates the result of a “Find” operation. When
set, this bit indicates that the data in the comparand
register matches at least one entry in the CAM (as
masked by the mask entries). If this bit is reset, this bit
indicates that no entry in the CAM matches the data in
the comparand register. This bit is cleared as a result of
a “Skip” or “Invalidate” operation.
EXACT (bit 12)
Exact Match
This bit reflects the result of a “Find” operation. When
set, this bit indicates that at least one matching CAM
entry (as masked by its mask entry) has the DAX bit set
in its personality byte. If this bit is reset, no matching
CAM entries have the DAX bit set in the corresponding
personality bytes. This bit is cleared as a result of a
“Skip” or “Invalidate” operation.
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