FM25Q64ꢀ
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11.2.32ꢀSetꢀBurstꢀwithꢀWrapꢀ(77h)ꢀ ꢀ
TheꢀSetꢀBurstꢀwithꢀWrapꢀ(77h)ꢀinstructionꢀisꢀusedꢀinꢀconjunctionꢀwithꢀ“FastꢀReadꢀQuadꢀI/O”ꢀandꢀ
“Wordꢀ Readꢀ Quadꢀ I/O”ꢀ instructionsꢀ toꢀ accessꢀ aꢀfixedꢀ lengthꢀ ofꢀ8/16/32/64ꢁbyteꢀsectionꢀwithinꢀ aꢀ
256ꢁbyteꢀpage.ꢀCertainꢀapplicationsꢀcanꢀbenefitꢀfromꢀthisꢀfeatureꢀandꢀimproveꢀtheꢀoverallꢀsystemꢀ ꢀ
codeꢀexecutionꢀperformance.ꢀ ꢀ
SimilarꢀtoꢀaꢀQuadꢀI/Oꢀinstruction,ꢀtheꢀSetꢀBurstꢀwithꢀWrapꢀinstructionꢀisꢀinitiatedꢀbyꢀdrivingꢀtheꢀ/CSꢀ
pinꢀlowꢀandꢀthenꢀshiftingꢀtheꢀinstructionꢀcodeꢀ“77h”ꢀfollowedꢀbyꢀ24ꢀdummyꢀbitsꢀandꢀ8ꢀ“WrapꢀBits”,ꢀ ꢀ
W7ꢁ0.ꢀTheꢀinstructionꢀsequenceꢀisꢀshownꢀinꢀSetꢀBurstꢀwithꢀWrapꢀInstructionꢀSequence.ꢀ
WrapꢀbitꢀW7ꢀandꢀtheꢀlowerꢀnibbleꢀW3ꢁ0ꢀareꢀnotꢀused.ꢀ
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W4ꢀ=ꢀ0ꢀ
WrapꢀAroundꢀ ꢀ
W4ꢀ=ꢀ1(Default)ꢀ
W6,ꢀW5ꢀ
WrapꢀLengthꢀ
8ꢁbyteꢀ
WrapꢀAroundꢀ
WrapꢀLengthꢀ
N/Aꢀ
0ꢀ ꢀ ꢀ 0ꢀ
0ꢀ ꢀ ꢀ 1ꢀ
1ꢀ ꢀ ꢀ 0ꢀ
1ꢀ ꢀ ꢀ 1ꢀ
Yesꢀ
Yesꢀ
Yesꢀ
Yesꢀ
Noꢀ
Noꢀ
Noꢀ
Noꢀ
16ꢁbyteꢀ
N/Aꢀ
32ꢁbyteꢀ
N/Aꢀ
64ꢁbyteꢀ
N/Aꢀ
ꢀ
OnceꢀW6ꢁ4ꢀisꢀsetꢀbyꢀaꢀSetꢀBurstꢀwithꢀWrapꢀinstruction,ꢀallꢀtheꢀfollowingꢀ“FastꢀReadꢀQuadꢀI/O”ꢀandꢀ
instructionsꢀwillꢀuseꢀtheꢀW6ꢁ4ꢀsettingꢀtoꢀaccessꢀtheꢀ8/16/32/64ꢁbyteꢀsectionꢀwithinꢀanyꢀpage.ꢀToꢀexitꢀ
theꢀ “Wrapꢀ Around”ꢀ functionꢀ andꢀ returnꢀ toꢀ normalꢀ readꢀoperation,ꢀ anotherꢀ ꢀ Setꢀ Burstꢀ withꢀWrapꢀ
instructionꢀshouldꢀbeꢀissuedꢀtoꢀsetꢀW4ꢀ=ꢀ1.ꢀTheꢀdefaultꢀvalueꢀofꢀW4ꢀuponꢀpowerꢀonꢀisꢀ1.ꢀInꢀtheꢀ
caseꢀofꢀaꢀsystemꢀResetꢀwhileꢀW4ꢀ=ꢀ0,ꢀitꢀisꢀrecommendedꢀthatꢀtheꢀ ꢀ controllerꢀ ꢀ issuesꢀaꢀSetꢀBurstꢀ
withꢀWrapꢀinstructionꢀtoꢀresetꢀW4ꢀ=ꢀ1ꢀpriorꢀtoꢀanyꢀnormalꢀReadꢀinstructionsꢀ ꢀ sinceꢀFM25Q32ꢀdoesꢀ
notꢀhaveꢀaꢀhardwareꢀResetꢀPin.ꢀ
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SetꢀBurstꢀwithꢀWrapꢀInstructionꢀSequenceꢀ
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preliminary(Aug.18.2010)ꢀ ꢀ ꢀ ꢀ
48ꢀ