2 Signal descriptions M36P0R9070E0
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2.5 Wait (WAIT)
WAIT is an output pin common to the Flash memory and PSRAM components. However the
WAIT signal does not behave in the same way for the PSRAM and the Flash mem ory.
For details of how it behaves, please refer to the M69KB128AA datasheet for the PSRAM and
to the M58PR512J datasheet for the Flash memory.
2.6 Flash Chip Enable input (EF)
The Flash Chip Enable input activates the control logic, input buffers, decoders and sense
amplifiers of t he Flas h memory component selected . Wh en Chip Enab le is Low, VIL, and Reset
is High, VIH, the device is in active mode. When Chip Enable is at VIH the corresponding Flash
memory are deselected, the outputs are high impedance and the power consumption is
reduced to the stan dby level.
It is not allow ed to ha v e EF at VIL and EP at VIL at t he same ti me. Only one me mory component
can be enabled at a time.
2.7 Flash Output Enable inputs (GF)
The Output Enable pins control the data outputs during Flash memory Bus Read operations.
2.8 Flash Write Enable (WF)
The Write Enable controls the Bus Write operation of the Flash memory Command Interface.
The data and address inputs are latched on the rising edge of Chip Enable or Write Enable
whichever occurs first.
2.9 Flash Write Protect (WPF)
Write Prote ct is an input th at gives an additional ha rdware prot ec tio n for each block. When
Write Protect is Low, VIL, Lock-Down is enabled and the protection status of the Locked-Down
blocks cannot be changed. When Write Protect is at High, VIH, Lock-Down is disabled and the
Loc ke d-Do wn b loc ks can be loc ked or unloc k ed. (See the Loc k Status Table in the M58PR512J
datasheet).
2.10 Flash Reset (RPF)
The Reset input provides a hardware reset of the Flash memories. When Reset is at VIL, the
memory is in Reset mode: the outputs are high impedance and the current consumption is
reduced to the Reset Supply Current IDD2. Ref er to Table 7., Flash Memory DC Characte ristics
- Currents, for the value of IDD2. After Reset all bloc ks are in the Locked state and the
Configur ation Register is reset. When Reset i s at VIH, the device is in normal operation. Exit ing
Reset mode the device enters Asynchronous Read mode, b ut a negative transition of Chip
Enable or Latch Enable is required to ensure valid data outputs.