AM79C850KC datasheet(53/97 Pages) AMD

53 / 97 page

P R E L I M I N A R Y

AMD

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

status register are static; they are not cleared after a

read operation.

LSB

MSB

19574A-20

RESERVED

REV. NUMBER 0

REV. NUMBER 1

REV. NUMBER 2

BISTDONE

EMPTY

ERROR

MULT

EXACT

FOUND

FULL

DONE

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

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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