AM79C850 datasheet(52/97 Pages) AMD

52 / 97 page

AMD

P R E L I M I N A R Y

SUPERNET 3

INST 2:0

Function

000

Invalidate CAM: This function invalidates all entries in the CAM. The DONE, FULL, FOUND,

MULT, ERROR, BISTDONE and EXACT bits in the status register will be cleared when this com-

mand is issued. The DONE and EMPTY bits in the status register will be set upon completion of this

operation.

001

Write CAM: This function writes the contents of the comparand, mask and personality registers into

an empty location in the CAM. The DONE, FULL, FOUND, MULT, BISTDONE and EXACT bits in

the status register will be cleared when this command is issued. The DONE bit in the status register

will be set upon completion of this operation. The FULL bit in the status register will be set if the CAM

is full when this operation is completed. If the FULL bit is set when this command is issued, the write

operation will not be performed and the ERROR bit in the status register will be set. Otherwise, the

ERROR bit will be cleared.

010

Read CAM: This function causes the contents of the CAM entry matching the comparand (indi-

cated by the FOUND bit in the status register after a FIND command) to be written to the comparand,

mask and personality registers in the node processor interface. If more than one entry matches the

comparand (indicated by the MULT bit in the status register), one of the entries will be chosen arbi-

trarily. The DONE, FOUND, MULT, ERROR, BISTDONE and EXACT bits in the status register will

be cleared when this command is issued. Upon completion of this operation, the DONE bit in the

status register will be set. The ERROR bit will be set if this operation is attempted while the CAM is

empty or if the FOUND bit is not set.

011

Run BIST: This function causes the AF to initiate its built-in self test. The contents of the CAM, in-

cluding all of its registers, may be modified by the operation of this self test. The DONE, FOUND,

MULT, ERROR, BISTDONE and EXACT bits in the status register will be cleared when this com-

mand is issued. Upon completion of this operation, the DONE and BISTDONE bits in the status reg-

ister will be set. Other status bits may be in arbitrary states. The AF must be reset after BIST is com-

pleted to return it to a known state before performing any other operations on the AF.

100

Find: This function causes the AF to perform a parallel comparison of the comparand registers with

the contents of the CAM. CAM entries that have the SKIP bit set will not match the comparand. The

node processor mask registers do not participate in this operation. The DONE, FOUND, MULT, ER-

ROR, BISTDONE and EXACT bits in the status register will be cleared when this command is is-

sued. Upon completion of this operation, the DONE bit in the status register will be set and the

FOUND, MULT and EXACT bits will be updated with the appropriate status of the operation.

101

Invalidate: This function operates on the result of the last “Find” instruction, above, and sets the

INVALID bit in the personality of the first matching entry in the CAM. The DONE, FOUND, MULT,

ERROR, BISTDONE and EXACT bits in the status register will be cleared when this command is

issued. Upon completion of this operation, the DONE bit in the status register will be set. The

EMPTY bit will be updated with the appropriate status after the operation. The ERROR bit will be set

if this operation is attempted while the FOUND bit is not set. Otherwise, the ERROR bit will remain

cleared.

110

Skip: This function operates on the result of the latest “Find” operation and causes the AF to set the

SKIP bit in the personality of the first matching CAM entry. The SKIP bit will be set in the same entry

that will be read by issuing a “Read CAM” instruction. The DONE, FOUND, MULT, ERROR,

BISTDONE and EXACT bits in the status register will be cleared when this command is issued.

Upon completion of this operation, the DONE bit in the status register will be set. The ERROR bit will

be set if this operation is attempted while the FOUND bit is not set. Otherwise, the ERROR bit will

remain cleared.

111

Clear all SKIP bits: This function causes the CAM to clear all SKIP bits. The DONE, FOUND,

MULT, ERROR, BISTDONE and EXACT bits in the status register will be cleared when this com-

mand is issued. Upon completion of this operation, the DONE bit in the status register will be set.

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