AM29F002BT-70JC Spansion Inc., AM29F002BT-70JC Datasheet - Page 15

• Manufacturer Part Number: AM29F002BT-70JC
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.

Specifications of AM29F002BT-70JC

• Memory Size: 2Mbit
• Memory Configuration: 256K X 8
• Ic Interface Type: Parallel
• Access Time: 70ns
• Memory Case Style: PLCC
• No. Of Pins: 32
• Operating Temperature Range: 0°C To +70°C
• Termination Type: SMD

COMMAND DEFINITIONS
W r it in g s p ec i fi c a d d re s s a n d d a ta c o m m a n d s or
s eq ue nc es into th e co m m an d reg is te r i nitia te s dev ic e
o pera tions . T he C om m a nd D efinitio ns table de fin es the
v alid re gis ter c om m a nd s equ en ce s . W riting in co r r ect
a d d r e s s a n d d a t a va l u e s or w ri ti n g t h em i n th e
im p r o p er s eq u en c e r es ets the dev ic e to r ead ing ar ray
d ata.
A ll a ddr es s es a re latc hed o n the fa llin g e dg e o f W E# or
C E #, w hic h eve r ha pp en s la te r. Al l d ata is latc he d on
th e ris i ng e d ge o f W E # o r C E# , w hic h ev e r ha pp en s
fir s t. R efer to the a pp ro pr ia te ti m in g dia gr am s in the
“A C C h ara cter is tic s”
Read ing Array Data
T h e d ev ic e is au to m atic a lly s et to re ad ing a rray da ta
a fter d ev ic e p ow e r-u p. N o c om m a nds are r equ ire d to
re tri eve d a ta . T h e dev i c e is a ls o re ad y to r ea d arr ay
d a ta a ft e r c o m p l e ti n g a n E m b e d d e d P r og r a m or
E m bed de d Era s e alg orith m .
A fter the d ev ic e ac c epts a n Era s e Sus p end c o m m an d,
th e d ev ic e e n te r s th e E r a s e S u s p e nd m o de . T h e
s y s tem c an r ea d ar ray da ta u s in g th e s tan da rd re ad
tim in gs , ex c e p t th at if it re a ds a t a n a dd re s s w ith in
e ra s e- s us p en de d s e c to rs , the d ev ic e o u tp u ts s tatu s
d ata. Afte r c om p leting a pro gra m m ing ope ratio n in the
E ras e Su sp en d m o de, the s y s te m c an on c e a gai n r ead
a rray d ata w ith th e s a m e exc e ption . S ee
p end /E ras e R e su m e C om m a nd s”
in for m atio n on this m od e.
T h e s y s te m
e nab le th e dev ic e for rea di ng ar ray d ata if D Q 5 goe s
h ig h , o r w h ile in th e a uto s e le c t m od e . S e e
C o m m
S ee a ls o
“ D ev i c e B us O pe ra tio n
R e ad Op era tio ns ta ble pro vi des th e r ead p aram eters ,
a nd R e ad Op era ti on Ti m ing s dia gram s how s the tim ing
d iagra m .
Reset Co mmand
W r iti ng th e re s et c om m an d to the dev i c e re s ets the
d ev ic e to r ea di ng a rr ay d a ta . A d dr es s bi ts a re d on ’t
c ar e for thi s c om m and .
T h e r e s e t c o m m a n d c a n b e w r i tte n b e tw e e n th e
s e q u en c e c y c le s in a n e r as e c o m m a nd s e q u en c e
b efo re e ras in g be gin s. T h is res ets the d ev ic e to r ead ing
a rray d ata. On c e e ras u re b eg ins , how ev er, the dev ic e
i g n o r e s r e s e t c o m m a n d s u n ti l th e o p e r a t i o n i s
c om p lete.
T h e r e s e t c o m m a n d c a n b e w r i tte n b e tw e e n th e
s e qu e nc e c y c le s i n a p ro gr am c o m m an d s e qu e nc e
b efo re pro gram m ing be gin s. T h is re se ts th e dev ic e to
r ea di n g ar ra y d a ta (a ls o ap pl ie s to pr og ra m m in g in
and.”
“R e qu ir em e n ts for R e a din g A rr ay D ata
m u st
is s ue th e r e s e t c o m m a n d t o r e-
o n pa ge 26.
s” for m or e in for m a tio n. T h e
o n p ag e 16 fo r m ore
“Er as e Su s-
A m 29 F 002 B /A m 29 F 00 2N B
“ R e s e t
” in
E r as e Su s p en d m o d e) . O n c e p ro gr am m i ng b e gi ns ,
h ow ev er, th e de vi ce ign ore s res e t c o m m and s until th e
o pe ration i s c om p lete.
T h e re s e t c o m m a n d c a n b e w r i tt en b e tw e e n t h e
s e que nc e c yc le s in an au tos ele c t co m m an d s e que nc e.
O nc e in the auto se lec t m o de, th e re s et c om m and
b e w r itten to re tu rn to rea ding arr ay d ata ( als o a ppl ies
to a utos ele c t du rin g Era s e Su s pen d).
If D Q 5 go es hig h dur ing a p rog ram or e ras e op era ti on,
w r i tin g th e r e s e t c o m m a n d r e tu r n s th e d ev ic e t o
r e a d i n g a r r a y d a ta ( a l s o a p p li e s d u r i n g E r a s e
S us p end ).
Au to select Com man d Sequence
T he a uto s el ec t c om m an d s e qu en c e a llo w s th e h os t
s y s tem to ac c es s the m a nufac ture r a nd dev ic es co de s,
a n d de ter m in e w h ethe r or n ot a s ec to r is pro tec te d.
T he C om m an d D e fin itio n s ta ble s ho w s the a dd r es s
a nd da ta req uir em en ts . T hi s m ethod is a n al te rn ative to
th a t s h ow n in th e Au to s e le c t C o d es ( H i gh Vo lta g e
M etho d) ta ble , w hic h is inten de d for P R OM pro gra m -
m ers and req uire s V
T he a uto s e l ec t c om m a n d s e q u en c e is i n iti ate d by
w ritin g tw o un loc k c y c les , fol low e d by th e au tos e lec t
c o m m an d . T h e d ev i c e th e n e n te rs t he a u to s e le c t
m od e, a n d th e s y s tem c a n rea d a t an y a dd re s s a ny
n um b er o f tim es , w itho ut in itia ti ng a noth er c om m an d
s e que nc e.
A rea d c y c le a t a dd res s XX 00 h or r etriev es the m anu -
fac ture r c o de. A re ad cy c le at a dd res s X X0 1h retur ns
th e de v i c e c o d e . A re a d c y c le c o n tai n in g a s e c to r
a dd res s (S A) an d th e a ddr es s 02 h in r etur ns 0 1h if that
s e c to r is pro te c te d, or 0 0h if it is un pro te c te d. R efe r to
th e Sec tor A dd res s ta bles fo r va lid s ec tor a ddr es s es .
T h e s y s tem m u s t w rite th e r es et c om m and to e xi t th e
a utos e lec t m o de a nd re tu rn to re ad ing a rray data.
Byte Program Com mand Sequence
P r o g r a m m i n g is a fo u r - b u s - c y c l e o p er a ti o n . T h e
p rog ram c om m a nd s eq ue nc e is i nitiate d by w r iti ng tw o
u n lo ck w r ite c y c l es , fo ll ow e d by the p ro g ram s e t-u p
c o m m an d. T he pro gra m ad dre s s and da ta ar e w r itte n
n e x t, w hi c h i n tu rn in iti ate the Em be d de d P r og ra m
a lgo rithm . T h e s y s tem i s
c o ntrol s or tim in gs . T he dev ic e au to m atic ally prov id es
i nter nall y ge nera ted pro gram pu ls es a nd ve rify the pro -
g ram m e d ce ll m arg in. T he C o m m an d D e fi nition s tak e
s h ow s th e ad dre s s a nd d ata re qu irem e nts for th e by te
p rog ram c om m a nd s e que nc e.
W hen the E m be dde d Pro gra m al gor ithm is c om p lete,
t he d ev i c e the n re tu r ns to r ea d in g ar r ay d a ta a n d
a d d re s s e s a re no lo n ge r l a tc h ed . T h e s y s te m c a n
d eter m ine the s tatus o f th e p ro gram op eratio n b y us in g
ID
o n add res s bit A9 .
not
r equ ire d to pro vi de fu rthe r
must
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