AT91SAM9G46B-CU View Datasheet(PDF) - Atmel Corporation
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AT91SAM9G46B-CU Datasheet PDF : 1277 Pages
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48.13.2.3 Write Timings
Table 48-31. SMC Write Signals - NWE Controlled (WRITE_MODE = 1)
Min
Symbol Parameter
1.8V VDDIOM Supply
3.3V VDDIOM Supply
Unit
HOLD or NO HOLD SETTINGS (nwe hold ≠ 0, nwe hold = 0)
SMC15
SMC16
SMC17
Data Out Valid before NWE High
NWE Pulse Width
NBS0/A0 NBS1, NBS2/A1, NBS3, A2–A25
valid before NWE low
nwe pulse × tCPMCK - 2.9
nwe pulse × tCPMCK - 0.7
nwe setup × tCPMCK - 3.3
nwe pulse × tCPMCK - 3.6
ns
nwe pulse × tCPMCK - 0.3
ns
nwe setup × tCPMCK - 4.1
ns
SMC18 NCS low before NWE high
(nwe setup - ncs rd setup + nwe (nwe setup - ncs rd setup + nwe
pulse) × tCPMCK - 3.1
pulse) × tCPMCK - 3.4
ns
HOLD SETTINGS (nwe hold ≠ 0)
SMC19
NWE High to Data OUT, NBS0/A0 NBS1,
NBS2/A1, NBS3, A2–A25 change
nwe hold × tCPMCK - 4.0
nwe hold × tCPMCK - 4.6
ns
SMC20 NWE High to NCS Inactive(1)
(nwe hold - ncs wr hold) ×
tCPMCK - 3.2
NO HOLD SETTINGS (nwe hold = 0)
(nwe hold - ncs wr hold) ×
tCPMCK - 4.0
ns
SMC21
NWE High to Data OUT, NBS0/A0 NBS1,
NBS2/A1, NBS3, A2–A25, NCS change(1)
1.6
1.4
ns
Notes: 1. hold length = total cycle duration - setup duration - pulse duration. “hold length” is for “ncs wr hold length” or “NWE hold
length”.
Table 48-32. SMC Write NCS Controlled (WRITE_MODE = 0)
Min
Symbol Parameter
1.8V VDDIOM Supply
3.3V VDDIOM Supply
SMC22
SMC23
SMC24
Data Out Valid before NCS High
NCS Pulse Width
NBS0/A0 NBS1, NBS2/A1, NBS3, A2–A25
valid before NCS low
ncs wr pulse × tCPMCK - 2.8
ncs wr pulse × tCPMCK - 0.5
ncs wr setup × tCPMCK - 3.3
ncs wr pulse × tCPMCK - 3.5
ncs wr pulse × tCPMCK - 0.2
ncs wr setup × tCPMCK - 4.1
SMC25
SMC26
NWE low before NCS high
NCS High to Data Out, NBS0/A0, NBS1,
NBS2/A1, NBS3, A2–A25, change
(ncs wr setup - nwe setup + ncs (ncs wr setup - nwe setup + ncs
pulse) × tCPMCK - 2.4
pulse) × tCPMCK - 2.7
ncs wr hold × tCPMCK - 4.1
ncs wr hold × tCPMCK - 4.6
SMC27 NCS High to NWE Inactive
(ncs wr hold - nwe hold) ×
tCPMCK - 2.0
(ncs wr hold - nwe hold) ×
tCPMCK - 2.8
Unit
ns
ns
ns
ns
ns
ns
SAM9G46 Series [DATASHEET]
Atmel-11028G-ATARM-SAM9G46-Datasheet_08-Dec-15
1225
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