M36W0Rx0x0x7 Signal descriptions
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2.6 Flash Write Protect (WPF)
Write Protect is an input that gives an additional hardware protection 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 locked-down blocks can be locked or unlocked (refer to the lock status table in
M58WR032KT/B and M58WR064KT/B datasheet).
2.7 Flash Reset (RPF)
The Reset input provides a hardware reset of the memory. 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. Refer to the M58WR032KT/B or M58WR064KT/B
datasheet for the value of IDD2. After Reset all blocks are in the locked state and the
configuration register is reset. When Reset is at VIH, the device is in normal operation. Upon
exiting reset mode the device enters asynchronous read mode, but a negative transition of
Chip Enable or Latch Enable is required to ensure valid data outputs.
The Reset pin can be interfaced with 3 V logic without any additional circuitry. It can be tied
to VRPH (refer to the M58WR032KT/B or M58WR064KT/B datasheet).
2.8 Flash Latch Enable (LF)
Latch Enable latches the address bits on its rising edge. The address latch is transparent
when Latch Enable is Low, VIL, and it is inhibited when Latch Enable is High, VIH. Latch
Enable can be kept Low (also at board level) when the Latch Enable function is not required
or supported.
2.9 Flash Clock (KF)
The Clock input synchronizes the flash memory to the microcontroller during synchronous
read operations; the address is latched on a Clock edge (rising or falling, according to the
configuration settings) when Latch Enable is at VIL. Clock is ‘don't care’ during
asynchronous read and in write operations.
2.10 Flash Wait (WAITF)
WAIT is a flash output signal used during synchronous read to indicate whether the data on
the output bus are valid. This output is high impedance when flash Chip Enable is at VIH or
flash Reset is at VIL. It can be configured to be active during the wait cycle or one clock
cycle in advance. The WAITF signal is not gated by Output Enable.
2.11 PSRAM Chip Enable (EP)
When asserted (Low), the Chip Enable, EP, activates the memory state machine, address
buffers and decoders, allowing read and write operations to be performed. When de-
asserted (High), all other pins are ignored and the device is automatically put in low-power
standby mode.