![](http://datasheet.mmic.net.cn/100000/ID80C32E-L16SHXXX_datasheet_3493627/ID80C32E-L16SHXXX_1257.png)
1257
SAM9X35 [DATASHEET]
11055E–ATARM–10-Mar-2014
47.16.2.3 Write Timings
Notes: 1. xxxhold length = total cycle duration - setup duration - pulse duration. “hold length” is for “ncs wr hold length” or “NWE
hold length”.
Table 47-35. 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)
SMC15
Data Out Valid before NWE High
nwe pulse
× tCPMCK - 3.9
nwe pulse
× tCPMCK - 3.9
ns
SMC16
NWE Pulse Width
nwe pulse
× tCPMCK - 3.2
nwe pulse
× tCPMCK - 3.2
ns
SMC17
NBS0/A0 NBS1, NBS2/A1, NBS3,
A2–A25 valid before NWE low
nwe setup
× tCPMCK - 4.2
nwe setup
× tCPMCK - 4.0
ns
SMC18
NCS low before NWE high
(nwe setup - ncs rd setup
+ nwe pulse)
× tCPMCK -
4.2
(nwe setup - ncs rd setup
+ nwe pulse)
× tCPMCK -
4.2
ns
HOLD SETTINGS (nwe hold
≠ 0)
SMC19
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2–A25
change
nwe hold
× tCPMCK - 4.8
nwe hold
× tCPMCK - 4.0
ns
SMC20
NWE High to NCS Inactive
(1)(nwe hold - ncs wr hold)
× tCPMCK - 4.0
(nwe hold - ncs wr hold)
× tCPMCK - 3.5
ns
NO HOLD SETTINGS (nwe hold = 0)
SMC21
NWE High to Data OUT, NBS0/A0
NBS1, NBS2/A1, NBS3, A2–A25,
1.9
1.5
ns
SMC21b
Min Period/Max Frequency with
No Hold settings
11.4
9.7
87
103
ns/
MHz
Table 47-36. SMC Write NCS Controlled (WRITE_MODE = 0)
Symbol
Parameter
Min
Unit
1.8V Supply
3.3V Supply
SMC22
Data Out Valid before NCS High
ncs wr pulse
× tCPMCK - 2.9
ncs wr pulse
× tCPMCK - 3.0
ns
SMC23
NCS Pulse Width
ncs wr pulse
× tCPMCK - 4.0
ncs wr pulse
× tCPMCK - 4.0
ns
SMC24
NBS0/A0 NBS1, NBS2/A1, NBS3, A2–
A25 valid before NCS low
ncs wr setup
× tCPMCK - 3.6
ncs wr setup
× tCPMCK - 3.5
ns
SMC25
NWE low before NCS high
(ncs wr setup - nwe setup + ncs
pulse)
× tCPMCK - 4.6
(ncs wr setup - nwe setup + ncs
pulse)
× tCPMCK - 4.6
ns
SMC26
NCS High to Data Out, NBS0/A0, NBS1,
NBS2/A1, NBS3, A2 - A25, change
ncs wr hold
× tCPMCK - 5.4
ncs wr hold
× tCPMCK - 4.5
ns
SMC27
NCS High to NWE Inactive
(ncs wr hold - nwe hold)
× tCPMCK
- 4.2
(ncs wr hold - nwe hold)
× tCPMCK
- 3.8
ns