37.10.1.3 Read Cycle

The NRD_CYCLE time is defined as the total duration of the read cycle, that is, from the time when the address is set on the address bus to the point when the address may change. The total read cycle time is defined as:

• NRD_CYCLE = NRD_SETUP + NRD_PULSE + NRD_HOLD

as well as

• NRD_CYCLE = NCS_RD_SETUP + NCS_RD_PULSE + NCS_RD_HOLD

All NRD and NCS timings are defined separately for each chip select as an integer number of main system bus clock cycles. The NRD_CYCLE field is common to both the NRD and NCS signals, thus the timing period is of the same duration.

NRD_CYCLE, NRD_SETUP and NRD_PULSE implicitly define the NRD_HOLD value as:

• NRD_HOLD = NRD_CYCLE - NRD SETUP - NRD PULSE

NRD_CYCLE, NCS_RD_SETUP and NCS_RD_PULSE implicitly define the NCS_RD_HOLD value as:

• NCS_RD_HOLD = NRD_CYCLE - NCS_RD_SETUP - NCS_RD_PULSE