Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
1058
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
48.13.2.3 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”.
Table 48-28. SMC Write Signals - NWE Controlled (WRITE_MODE = 1)
Symbol
Parameter
Min
Units
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
- 4.1
nwe pulse * t
CPMCK
- 4.0
ns
SMC
16
NWE Pulse Width
nwe pulse * t
CPMCK
- 3.0
nwe pulse * t
CPMCK
- 3.1
ns
SMC
17
NBS0/A0 NBS1, NBS2/A1, NBS3, A2 -
A25 valid before NWE low
A25 valid before NWE low
nwe setup * t
CPMCK
- 4.2
nwe setup * t
CPMCK
- 4.1
ns
SMC
18
NCS low before NWE high
(nwe setup - ncs rd setup + nwe
pulse) * t
CPMCK
- 3.8
(nwe setup - ncs rd setup +
nwe pulse) * t
CPMCK
- 3.7
ns
HOLD SETTINGS (nwe hold
≠ 0)
SMC
19
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2 - A25
change
NBS1, NBS2/A1, NBS3, A2 - A25
change
nwe hold * t
CPMCK
- 4.0
nwe hold * t
CPMCK
- 3.1
ns
SMC
20
NWE High to NCS Inactive
(1)
(nwe hold - ncs wr hold)* t
CPMCK
-
2.8
(nwe hold - ncs wr hold)*
t
CPMCK
- 2.0
ns
NO HOLD SETTINGS (nwe hold = 0)
SMC
21
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2 - A25, NCS
change
NBS1, NBS2/A1, NBS3, A2 - A25, NCS
change
(1)
1.6
1.4
ns
Table 48-29. 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
- 4.3
ncs wr pulse * t
CPMCK
- 4.5
ns
SMC
23
NCS Pulse Width
ncs wr pulse * t
CPMCK
- 4.0
ncs wr pulse * t
CPMCK
- 4.0
ns
SMC
24
NBS0/A0 NBS1, NBS2/A1, NBS3,
A2 - A25 valid before NCS low
ncs wr setup * t
CPMCK
- 3.6
ncs wr setup * t
CPMCK
- 3.5
ns
SMC
25
NWE low before NCS high
(ncs wr setup - nwe setup + ncs
pulse)* t
CPMCK
- 3.9
(ncs wr setup - nwe setup +
ncs pulse)* t
CPMCK
- 3.9
ns
SMC
26
NCS High to Data Out, NBS0/A0, NBS1,
NBS2/A1, NBS3, A2 - A25, change
NBS2/A1, NBS3, A2 - A25, change
ncs wr hold * t
CPMCK
- 6.1
ncs wr hold * t
CPMCK
- 5.2
ns
SMC
27
NCS High to NWE Inactive
(ncs wr hold - nwe hold)* t
CPMCK
-
4.8
(ncs wr hold - nwe hold)*
t
CPMCK
- 4.4
ns