at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 775

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 41-3. SMC Timings - NCS Controlled Read and Write
6384B–ATARM–15-Dec-08
A0/A1/NBS[3:0]/A2-A25
D0 - D15
NWE
NRD
NCS
Table 41-28. SMC Write NCS Controlled (WRITE_MODE = 0)
Symbol
SMC
SMC
SMC
SMC
SMC
SMC
SMC12
SMC13
NCS Controlled READ
22
23
24
25
26
27
with NO HOLD
SMC14
Parameter
Data Out Valid before NCS High
NCS Pulse Width
NBS0/A0 NBS1, NBS2/A1, NBS3, A2
- A25 valid before NCS low
NWE low before NCS high
NCS High to Data Out, NBS0/A0,
NBS1, NBS2/A1, NBS3, A2 - A25,
change
NCS High to NWE Inactive
SMC8
SMC9
SMC12
SMC13
NCS Controlled READ
SMC14
with HOLD
SMC10
SMC11
AT91SAM9G20 Preliminary
nwe setup + ncs
pulse)* t
(ncs wr setup -
ncs wr pulse *
ncs wr pulse *
ncs wr setup *
(ncs wr hold -
ncs wr hold *
1.8V Supply
t
t
t
CPMCK
t
t
nwe hold)*
CPMCK
CPMCK
CPMCK
CPMCK
0.4
SMC24
CPMCK
+ 0.1
-0.6
-0.2
-0.8
-0.2
SMC25
NCS Controlled WRITE
-
Min
SMC23
nwe setup + ncs
pulse)* t
(ncs wr setup -
ncs wr pulse *
ncs wr pulse *
ncs wr setup *
(ncs wr hold -
SMC22
ncs wr hold *
3.3V Supply
t
t
t
t
t
nwe hold)*
CPMCK
CPMCK
CPMCK
CPMCK
CPMCK
0.3
CPMCK
SMC27
-0.1
-0.6
-0.2
-0.7
-0.2
SMC26
SMC26
-
Units
ns
ns
ns
ns
ns
ns
775