FLASH
AS29F010
Austin Semiconductor, Inc.
Undeꢂ ahiꢃ cpndiaipn, ahe device hrlaꢃ ahe pꢁeꢂraipn, rnd ohen
ahe pꢁeꢂraipn hrꢃ exceeded ahe aiming limiaꢃ, DQ5 ꢁꢂpdsceꢃ r
“±.”
Undeꢂ bpah aheꢃe cpndiaipnꢃ, ahe ꢃꢄꢃaem msꢃa iꢃꢃse ahe
ꢂeꢃea cpmmrnd ap ꢂeasꢂn ahe device ap ꢂerding rꢂꢂrꢄ drar.
ꢃelecaed fpꢂ eꢂrꢃing rꢂe ꢁꢂpaecaed, DQ6 apggleꢃ fpꢂ
rꢁꢁꢂpximraelꢄ ±00µꢃ, ahen ꢂeasꢂnꢃ ap ꢂerding rꢂꢂrꢄ drar. If npa
rll ꢃelecaed ꢃecapꢂꢃ rꢂe ꢁꢂpaecaed, ahe Embedded Eꢂrꢃe
rlgpꢂiahm eꢂrꢃeꢃ ahe snꢁꢂpaecaed ꢃecapꢂꢃ, rnd ignpꢂeꢃ ahe
ꢃelecaed ꢃecapꢂꢃ ahra rꢂe ꢁꢂpaecaed.
If r ꢁꢂpgꢂrm rddꢂeꢃꢃ frllꢃ oiahin r ꢁꢂpaecaed ꢃecapꢂ, DQ6
apggleꢃ fpꢂ rꢁꢁꢂpximraelꢄ 2µꢃ rfaeꢂ ahe ꢁꢂpgꢂrm cpmmrnd
ꢃeqsence iꢃ oꢂiaaen, ahen ꢂeasꢂnꢃ ap ꢂerding rꢂꢂrꢄ drar.
The Wꢂiae Oꢁeꢂraipn Sarasꢃ arble ꢃhpoꢃ ahe psaꢁsaꢃ fpꢂ
Tpggle Bia I pn DQ6. Refeꢂ ap Figsꢂe 4 fpꢂ ahe apggle bia
rlgpꢂiahm, rnd ap ahe Tpggle Bia Timingꢃ figsꢂe in ahe “AC
Chrꢂrcaeꢂiꢃaicꢃ” ꢃecaipn fpꢂ ahe aiming dirgꢂrm.
FIGURE 4: TOGGLE BIT ALGORITHM
Reading Toggle Bit DQ6
Refeꢂ ap Figsꢂe 4 fpꢂ ahe fpllpoing diꢃcsꢃꢃipn. Wheneveꢂ
ahe ꢃꢄꢃaem iniairllꢄ beginꢃ ꢂerding apggle bia ꢃarasꢃ, ia msꢃa
ꢂerd DQ7-DQ0 ra lerꢃa aoice in r ꢂpo ap deaeꢂmine oheaheꢂ r
apggle bia iꢃ apggling. Tꢄꢁicrllꢄ, r ꢃꢄꢃaem opsld npae rnd ꢃapꢂe
ahe vrlse pf ahe apggle bia rfaeꢂ ahe fiꢂꢃa ꢂerd. Afaeꢂ ahe ꢃecpnd
ꢂerd, ahe ꢃꢄꢃaem opsld cpmꢁrꢂe ahe neo vrlse pf ahe apggle bia
oiah ahe fiꢂꢃa. If ahe apggle bia iꢃ npa apggling, ahe device hrꢃ
cpmꢁleaed ahe ꢁꢂpgꢂrm pꢂ eꢂrꢃe pꢁeꢂraipn. The ꢃꢄꢃaem crn
ꢂerd rꢂꢂrꢄ drar pn DQ7-DQ0 pn ahe fpllpoing ꢂerd cꢄcle.
Hpoeveꢂ, if rfaeꢂ ahe iniairl aop ꢂerd cꢄcleꢃ, ahe ꢃꢄꢃaem
deaeꢂmineꢃ ahra ahe apggle bia iꢃ ꢃaill apggling, ahe ꢃꢄꢃaem rlꢃp
ꢃhpsld npae oheaheꢂ ahe vrlse pf DQ5 iꢃ high (ꢃee ahe ꢃecaipn
pn DQ5). If ia iꢃ, ahe ꢃꢄꢃaem ꢃhpsld ahen deaeꢂmine rgrin oheaheꢂ
ahe apggle bia iꢃ apggling, ꢃince ahe apggle bia mrꢄ hrve ꢃapꢁꢁed
apggling jsꢃa rꢃ DQ5 oena high. If ahe apggle bia iꢃ np lpngeꢂ
apggling, ahe device hrꢃ ꢃscceꢃꢃfsllꢄ cpmꢁleaed ahe ꢁꢂpgꢂrm
pꢂ eꢂrꢃe pꢁeꢂraipn. If ia iꢃ ꢃaill apggling, ahe device did npa
cpmꢁleae ahe pꢁeꢂraipn ꢃscceꢃꢃfsllꢄ, rnd ahe ꢃꢄꢃaem msꢃa oꢂiae
ahe ꢂeꢃea cpmmrnd ap ꢂeasꢂn ap ꢂerding rꢂꢂrꢄ drar.
The ꢂemrining ꢃcenrꢂip iꢃ ahra ahe ꢃꢄꢃaem iniairllꢄ
deaeꢂmineꢃ ahra ahe apggle bia ia apggling rnd DQ5 hrꢃ npa gpne
high. The ꢃꢄꢃaem mrꢄ cpnainse ap mpniapꢂ ahe apggle bia rnd
DQ5 ahꢂpsgh ꢃscceꢃꢃive ꢂerd cꢄcleꢃ, deaeꢂmining ahe ꢃarasꢃ rꢃ
deꢃcꢂibed in ahe ꢁꢂevipsꢃ ꢁrꢂrgꢂrꢁh. Alaeꢂnraivelꢄ, ia mrꢄ
chppꢃe ap ꢁeꢂfpꢂm paheꢂ ꢃꢄꢃaem arꢃkꢃ. In ahiꢃ crꢃe, ahe ꢃꢄꢃaem
msꢃa ꢃarꢂa ra ahe beginning pf ahe rlgpꢂiahm ohen ia ꢂeasꢂnꢃ ap
deaeꢂmine ahe ꢃarasꢃ pf ahe pꢁeꢂraipn (apꢁ pf Figsꢂe 4).
DQ5: Exceeded Timing Limits
DQ5 indicraeꢃ oheaheꢂ ahe ꢁꢂpgꢂrm pꢂ eꢂrꢃe aime hrꢃ
exceeded r ꢃꢁecified inaeꢂnrl ꢁslꢃe cpsna limia. Undeꢂ aheꢃe
cpndiaipnꢃ DQ5 ꢁꢂpdsceꢃ r “±.” Thiꢃ iꢃ r frilsꢂe cpndiaipn ahra
indicraeꢃ ahe ꢁꢂpgꢂrm pꢂ eꢂrꢃe cꢄcle orꢃ npa ꢃscceꢃꢃfsllꢄ
cpmꢁleaed.
The DQ5 frilsꢂe cpndiaipn mrꢄ rꢁꢁerꢂ if ahe ꢃꢄꢃaem aꢂieꢃ ap
ꢁꢂpgꢂrm r “±” ap r lpcraipn ahra iꢃ ꢁꢂevipsꢃlꢄ ꢁꢂpgꢂrmmed ap
“0.” Onlꢄ rn eꢂrꢃe pꢁeꢂraipn crn chrnge r “0” brck ap r “±.”
NOTE:
±) Rerd apggle bia aoice ap deaeꢂmine oheaheꢂ pꢂ npa ia iꢃ apggling. See
aexa.
2) Recheck apggle bia becrsꢃe ia mrꢄ ꢃapꢁ apggling rꢃ DQ5 chrngeꢃ ap
“±”. See aexa.
AS29F010
AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.
Rev. 2.3 12/08
11
AUSTIN [ AUSTIN SEMICONDUCTOR ]
