Rainbow Electronics AT91CAP9S250A User Manual
Page 970
970
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
47.10.4.3
Write Timings
Notes:
1. hold length = total cycle duration - setup duration - pulse duration. “hold length” is for “ncs wr hold length” or “NWE hold
length”.
SMC
12
NBS0/A0, NBS1, NBS2/A1, NBS3,
A2 - A25 valid before NCS High
(ncs rd setup + ncs rd pulse)*
t
CPMCK
+ TBD
(ncs rd setup + ncs rd pulse)*
t
CPMCK
+ TBD
ns
SMC
13
NRD low before NCS High
(ncs rd setup + ncs rd pulse - nrd
setup)* t
CPMCK
+ TBD
(ncs rd setup + ncs rd pulse - nrd
setup)* t
CPMCK
+ TBD
ns
SMC
14
NCS Pulse Width
ncs rd pulse length * t
CPMCK
+
TBD
ncs rd pulse length * t
CPMCK
+
TBD
ns
Table 47-24. SMC Write Signals - NWE controlled (WRITE_MODE = 1)
Symbol
Parameter
Min
Max
Units
1.8V Supply
3.3V Supply
1.8V Supply
3.3V Supply
HOLD or NO HOLD SETTINGS (nwe hold
≠
0, nwe hold = 0)
SMC
15
Data Out Valid before NWE High
nwe pulse *
t
CPMCK
+ TBD
nwe pulse *
t
CPMCK
+ TBD
ns
SMC
16
NWE Pulse Width
nwe pulse *
t
CPMCK
+ TBD
nwe pulse *
t
CPMCK
+ TBD
ns
SMC
17
NBS0/A0 NBS1, NBS2/A1, NBS3,
A2 - A25 valid before NWE low
nwe setup *
t
CPMCK
+ TBD
nwe setup *
t
CPMCK
+ TBD
ns
SMC
18
NCS low before NWE high
(nwe setup -
ncs rd setup +
nwe pulse) *
t
CPMCK
+ TBD
(nwe setup -
ncs rd setup +
nwe pulse) *
t
CPMCK
+ TBD
ns
HOLD SETTINGS (nwe hold
≠
0)
SMC
19
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2 - A25
change
nwe hold *
t
CPMCK
+ TBD
nwe hold *
t
CPMCK
+ TBD
ns
SMC
20
NWE High to NCS Inactive
(1)
(nwe hold - ncs
wr hold )*
t
CPMCK
+ TBD
(nwe hold - ncs
wr hold )*
t
CPMCK
+ TBD
ns
NO HOLD SETTINGS (nwe hold = 0)
SMC
21
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2 - A25,
NCS change
(1)
TBD
TBD
ns
Table 47-23. SMC Read Signals - NCS Controlled (READ_MODE= 0)
Table 47-25. SMC Write NCS Controlled (WRITE_MODE = 0)
Symbol
Parameter
Min
Units
1.8V Supply
3.3V Supply
SMC
22
Data Out Valid before NCS High
ncs wr pulse * t
CPMCK
+ TBD
ncs wr pulse * t
CPMCK
+ TBD
ns
SMC
23
NCS Pulse Width
ncs wr pulse * t
CPMCK
+ TBD
ncs wr pulse * t
CPMCK
+ TBD
ns
SMC
24
NBS0/A0 NBS1, NBS2/A1, NBS3, A2 -
A25 valid before NCS low
ncs wr setup * t
CPMCK
+ TBD
ncs wr setup * t
CPMCK
+ TBD
ns