Atmel AT91FR40162S, Manual

Page: 190 / 210

190
6174B–ATARM–07-Nov-05
AT91FR40162S Preliminary
Notes: 1. Early Read Protocol.
2. Standard Read Protocol.
3. The derating factor should not be applied to t
CH
or t
CP
.
4. n = number of standard wait states inserted.
5. Only one of these two timings, EB
25
or EBI
31
, needs to be met.
6. Only one of these two timings, EB
26
or EBI
32
, needs to be met.
Notes: 1. If this condition is not met, the action depends on the read protocol intended for use.
• Early Read Protocol: Programing an additional t
DF
(Data Float Output Time) cycle.
• Standard Read Protocol: Programming an additional t
DF
Cycle and an additional wait state.
2. Applicable only for chip select programmed with 0 wait state. If this condition is not met, at least one wait state must be
programmed.
EBI
31
Data Setup before NRD High
(5)
C
NRD
= 0 pF 8.0 ns
C
NRD
derating 0.044 ns/pF
EBI
32
Data Hold after NRD High
(6)
C
NRD
= 0 pF -3.1 ns
C
NRD
derating -0.030 ns/pF
EBI
33
NRD Minimum Pulse Width
(1)(3)
C
NRD
= 0 pF (n +1) t
CP
- 1.9
(4)
ns
C
NRD
derating 0.001 ns/pF
EBI
34
NRD Minimum Pulse Width
(2)(3)
C
NRD
= 0 pF n x t
CP
+ (t
CH
- 1.5)
(4)
ns
C
NRD
derating 0.001 ns/pF
Table 20-12. EBI Read Signals (Continued)
Symbol Parameter Conditions Min Max Units
Table 20-13. EBI Read and Write Control Signals. Capacitance Limitation
Symbol Parameter Conditions Min Max Units
T
CPLNRD
(1)
Master Clock Low Due to NRD Capacitance
C
NRD
= 0 pF 7.3 ns
C
NRD
derating 0.044 ns/pF
T
CPLNWR
(2)
Master CLock Low Due to NWR Capacitance
C
NWR
= 0 pF 7.6 ns
C
NWR
derating 0.044 ns/pF