ARM ARM PL241 Dokumentacja Pobierz pdf (Strona 36)

Functional Overview

The state transitions are:

Ready to Reset

When reset is asserted to the smc_aclk domain, it enters the Reset

state.

Reset to Ready

When reset is deasserted to the smc_aclk domain, it enters the

Ready state.

Ready to Low-power

The Low-power state is entered when the SMC next becomes idle

after either:

• the SMC receives a low-power request through the APB

smc_memc_cfg_set Register

• the SMC receives a low-power request through the SMC

low-power interface.

Low-power to Ready

The SMC exits the Low-power state back to Ready when either:

• the SMC low-power request bit is cleared in the APB

smc_memc_cfg_clr Register

• the SMC low-power interface negates the low-power

request.

Low-power to Reset

When Reset is asserted to the smc_aclk reset domain, it enters the

Reset state.

2.4.2 Clocking and resets

This section describes:

• Clocking

• Resets on page 2-17.

Clocking

All configurations of the SMC support at least two clock domains, and have the

following clock inputs:

• smc_aclk

• smc_mclk0

• smc_mclk0n.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 109 110

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ARM ARM PL241 Dokumentacja Strona 36