SAM3S8B Atmel Corporation, SAM3S8B Datasheet - Page 384

• Manufacturer Part Number: SAM3S8B
• Manufacturer: Atmel Corporation

23.8.2.1
Figure 23-7. READ_MODE = 1: Data is sampled by SMC before the rising edge of NRD
23.8.2.2
384
384
SAM3S8/SD8
SAM3S8/SD8
Read is Controlled by NRD (READ_MODE = 1):
Read is Controlled by NCS (READ_MODE = 0)
A[23:0]
D[7:0]
MCK
NRD
NCS
Figure 23-7
data is available t
In this case, the READ_MODE must be set to 1 (read is controlled by NRD), to indicate that data
is available with the rising edge of NRD. The SMC samples the read data internally on the rising
edge of Master Clock that generates the rising edge of NRD, whatever the programmed wave-
form of NCS may be.
Figure 23-8
falling edge of the NCS signal and remains valid until the rising edge of NCS. Data must be sam-
pled when NCS is raised. In that case, the READ_MODE must be set to 0 (read is controlled by
NCS): the SMC internally samples the data on the rising edge of Master Clock that generates
the rising edge of NCS, whatever the programmed waveform of NRD may be.
shows the waveforms of a read operation of a typical asynchronous RAM. The read
shows the typical read cycle of an LCD module. The read data is valid t
PACC
after the falling edge of NRD, and turns to ‘Z’ after the rising edge of NRD.
t
PACC
Data Sampling
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
PACC
after the