39.7.15.1 Protocol and Timings in Page Mode
The following figure shows the NRD and NCS timings in Page mode access.
The NRD and NCS signals are held low during all read transfers, whatever the programmed values of the setup and hold timings in the User Interface may be. Moreover, the NRD and NCS timings are identical. The pulse length of the first access to the page is defined with the NCS RD PULSE field of the
SMC PULSE register. The pulse length of subsequent accesses within the page are defined using the NRD PULSE parameter.
In Page mode, the programming of the read timings is described in the following table:
| Parameter | Value | Definition |
|---|---|---|
| READ MODE | 'x' | No impact. |
| NCS RD SETUP | 'x' | No impact. |
| NCS RD PULSE | tpa | Access time of first access to the page. |
| NRD SETUP | 'x' | No impact. |
| NRD PULSE | tsa | Access time of subsequent accesses in the page. |
| NRD CYCLE | 'x' | No impact. |
The SMC does not check the coherency of timings. It will always apply the NCS RD PULSE timings as page access timing (tpa) and the NRD PULSE for accesses to the page (tsa), even if the programmed value for tpa is shorter than the programmed value for tsa.