Datasheet
2017 Microchip Technology Inc. DS60001516A-page 751
SAM9G20
40.10.2 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 40-28: SMC Read Signals - NCS Controlled (READ_MODE = 0)
Symbol Parameter
Min
Unit1.8V VDDIOM Supply 3.3V VDDIOM Supply
NO HOLD SETTINGS (ncs rd hold = 0)
SMC
8
Data Setup before NCS High 12.6 11.0 ns
SMC
9
Data Hold after NCS High 0 0 ns
HOLD SETTINGS (ncs rd hold ≠ 0)
SMC
10
Data Setup before NCS High 9.2 7.6 ns
SMC
11
Data Hold after NCS High 0 0 ns
HOLD or NO HOLD SETTINGS (ncs rd hold ≠ 0, ncs rd hold = 0)
SMC
12
NBS0/A0, NBS1, NBS2/A1, NBS3,
A2–A25 valid before NCS High
(ncs rd setup + ncs rd pulse) * t
CPMCK
- 0.8
(ncs rd setup + ncs rd pulse) * t
CPMCK
- 0.6
ns
SMC
13
NRD low before NCS High
(ncs rd setup + ncs rd pulse - nrd
setup) * t
CPMCK
-0.2
(ncs rd setup + ncs rd pulse - nrd
setup) * t
CPMCK
-0.3
ns
SMC
14
NCS Pulse Width ncs rd pulse length * t
CPMCK
+ 0.1 ncs rd pulse length * t
CPMCK
- 0.1 ns
Table 40-29: SMC Write Signals - NWE controlled (WRITE_MODE = 1)
Symbol Parameter
Min
Unit1.8V VDDIOM Supply 3.3V VDDIOM Supply
HOLD or NO HOLD SETTINGS (nwe hold ≠ 0, nwe hold = 0)
SMC
15
Data Out Valid before NWE High nwe pulse * t
CPMCK
- 0.8 nwe pulse * t
CPMCK
- 0.8 ns
SMC
16
NWE Pulse Width nwe pulse * t
CPMCK
- 0.4 nwe pulse * t
CPMCK
- 0.4 ns
SMC
17
NBS0/A0 NBS1, NBS2/A1, NBS3,
A2–A25 valid before NWE low
nwe setup * t
CPMCK
- 0.5 nwe setup * t
CPMCK
- 0.5 ns
SMC
18
NCS low before NWE high
(nwe setup - ncs rd setup + nwe
pulse) * t
CPMCK
- 0.2
(nwe setup - ncs rd setup + nwe
pulse) * t
CPMCK
- 0.2
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
- 0.4 nwe hold * t
CPMCK
- 0.4 ns
SMC
20
NWE High to NCS Inactive
(1)
(nwe hold - ncs wr hold) * t
CPMCK
-0.3
(nwe hold - ncs wr hold) * t
CPMCK
-
0.3
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)
3.4 3.1 ns