Datasheet

1169
SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
45.13.2.3 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 45-31. 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
- 2.9 nwe pulse × t
CPMCK
- 3.6 ns
SMC
16
NWE Pulse Width nwe pulse × t
CPMCK
- 0.7 nwe pulse × t
CPMCK
- 0.3 ns
SMC
17
NBS0/A0 NBS1, NBS2/A1, NBS3, A2–A25
valid before NWE low
nwe setup × t
CPMCK
- 3.3 nwe setup × t
CPMCK
- 4.1 ns
SMC
18
NCS low before NWE high
(nwe setup - ncs rd setup + nwe
pulse) × t
CPMCK
- 3.1
(nwe setup - ncs rd setup + nwe
pulse) × t
CPMCK
- 3.4
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
- 4.0 nwe hold × t
CPMCK
- 4.6 ns
SMC
20
NWE High to NCS Inactive
(1)
(nwe hold - ncs wr hold) ×
t
CPMCK
- 3.2
(nwe hold - ncs wr hold) ×
t
CPMCK
- 4.0
ns
NO HOLD SETTINGS (nwe hold = 0)
SMC
21
NWE High to Data OUT, NBS0/A0 NBS1,
NBS2/A1, NBS3, A2–A25, NCS change
(1)
1.6 1.4 ns
Table 45-32. SMC Write NCS Controlled (WRITE_MODE = 0)
Symbol Parameter
Min
Unit1.8V VDDIOM Supply 3.3V VDDIOM Supply
SMC
22
Data Out Valid before NCS High ncs wr pulse × t
CPMCK
- 2.8 ncs wr pulse × t
CPMCK
- 3.5 ns
SMC
23
NCS Pulse Width ncs wr pulse × t
CPMCK
- 0.5 ncs wr pulse × t
CPMCK
- 0.2 ns
SMC
24
NBS0/A0 NBS1, NBS2/A1, NBS3, A2–A25
valid before NCS low
ncs wr setup × t
CPMCK
- 3.3 ncs wr setup × t
CPMCK
- 4.1 ns
SMC
25
NWE low before NCS high
(ncs wr setup - nwe setup + ncs
pulse) × t
CPMCK
- 2.4
(ncs wr setup - nwe setup + ncs
pulse) × t
CPMCK
- 2.7
ns
SMC
26
NCS High to Data Out, NBS0/A0, NBS1,
NBS2/A1, NBS3, A2–A25, change
ncs wr hold × t
CPMCK
- 4.1 ncs wr hold × t
CPMCK
- 4.6 ns
SMC
27
NCS High to NWE Inactive
(ncs wr hold - nwe hold) ×
t
CPMCK
- 2.0
(ncs wr hold - nwe hold) ×
t
CPMCK
- 2.8
ns