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ATSAM4S-EK2
413
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
26.12.2 Frozen Mode
When the external device asserts the NWAIT signal (active low), and after internal synchronization of this signal, the
SMC state is frozen, i.e., SMC internal counters are frozen, and all control signals remain unchanged. When the
resynchronized NWAIT signal is deasserted, the SMC completes the access, resuming the access from the point where
it was stopped. See
SMC state is frozen, i.e., SMC internal counters are frozen, and all control signals remain unchanged. When the
resynchronized NWAIT signal is deasserted, the SMC completes the access, resuming the access from the point where
it was stopped. See
the access and to freeze the SMC.
.
Figure 26-23.Write Access with NWAIT Assertion in Frozen Mode (EXNW_MODE = 10)
EXNW_MODE = 10 (Frozen)
WRITE_MODE = 1 (NWE_controlled)
WRITE_MODE = 1 (NWE_controlled)
NWE_PULSE = 5
NCS_WR_PULSE = 7
NCS_WR_PULSE = 7
A[23:0]
MCK
NWE
NCS
4
3
2
1
1
1
0
1
4
5
6
3
2
2
2
2
1
0
Write cycle
D[7:0]
NWAIT
FROZEN STATE
internally synchronized
NWAIT signal