Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet
Product codes
AT91SAM9G25-EK
1116
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
46.16.2.3 Write Timings
Note:
1. hold length = total cycle duration - setup duration - pulse duration. “hold length” is for “ncs wr hold length” or “NWE
hold length”.
Table 46-34. SMC Write Signals - NWE Controlled (WRITE_MODE = 1)
Symbol
Parameter
Min
Max
Unit
1.8V Supply
3.3V Supply
1.8 V
Supply
3.3 V
Supply
HOLD or NO HOLD SETTINGS (nwe hold
≠ 0, nwe hold = 0)
SMC
15
Data Out Valid before NWE High
nwe pulse
× t
CPMCK
- 3.9
nwe pulse
× t
CPMCK
- 3.9
ns
SMC
16
NWE Pulse Width
nwe pulse
× t
CPMCK
- 3.2
nwe pulse
× t
CPMCK
- 3.2
ns
SMC
17
NBS0/A0 NBS1, NBS2/A1, NBS3,
A2–A25 valid before NWE low
A2–A25 valid before NWE low
nwe setup
× t
CPMCK
- 4.2
nwe setup
× t
CPMCK
- 4.0
ns
SMC
18
NCS low before NWE high
(nwe setup - ncs rd setup
+ nwe pulse)
× t
CPMCK
-
4.2
(nwe setup - ncs rd setup
+ nwe pulse)
× t
CPMCK
-
4.2
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
- 4.8
nwe hold
× t
CPMCK
- 4.0
ns
SMC
20
NWE High to NCS Inactive
(nwe hold - ncs wr hold)
×
t
CPMCK
- 4.0
(nwe hold - ncs wr hold)
×
t
CPMCK
- 3.5
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
1.9
1.5
ns
SMC
21b
Min Period/Max Frequency with
No Hold settings
No Hold settings
11.4
9.7
87
103
ns/
MHz
Table 46-35. SMC Write NCS Controlled (WRITE_MODE = 0)
Symbol
Parameter
Min
Unit
1.8V Supply
3.3V Supply
SMC
22
Data Out Valid before NCS High
ncs wr pulse
× t
CPMCK
- 2.9
ncs wr pulse
× t
CPMCK
- 3.0
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
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
- 4.6
(ncs wr setup - nwe setup + ncs
pulse)
× t
CPMCK
- 4.6
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
- 5.4
ncs wr hold
× t
CPMCK
- 4.5
ns
SMC
27
NCS High to NWE Inactive
(ncs wr hold - nwe hold)
× t
CPMCK
- 4.2
(ncs wr hold - nwe hold)
× t
CPMCK
- 3.8
ns