M29F800DB datasheet(13/53 Pages) STMICROELECTRONICS

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M29F800DT

Signal descriptions

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2.0.8

Reset/Block Temporary Unprotect (RP)

The Reset/Block Temporary Unprotect pin can be used to apply a Hardware Reset to the

memory or to temporarily unprotect all Blocks that have been protected.

A Hardware Reset is achieved by holding Reset/Block Temporary Unprotect Low, VIL, for at

least tPLPX. After Reset/Block Temporary Unprotect goes High, VIH, the memory will be

ready for Bus Read and Bus Write operations after tPHEL or tRHEL, whichever occurs last.

See Section 2.0.9: Ready/Busy output (RB), Table 15: Reset/Block Temporary Unprotect

AC characteristics, and Figure 13: Reset/Block Temporary Unprotect AC waveforms for

more details.

Holding RP at VID will temporarily unprotect the protected Blocks in the memory. Program

and Erase operations on all blocks will be possible. The transition from VIH to VID must be

slower than tPHPHH.

2.0.9

Ready/Busy output (RB)

The Ready/Busy pin is an open-drain output that can be used to identify when the device is

performing a Program or Erase operation. During Program or Erase operations Ready/Busy

is Low, VOL. Ready/Busy is high-impedance during Read mode, Auto Select mode and

Erase Suspend mode.

After a Hardware Reset, Bus Read and Bus Write operations cannot begin until Ready/Busy

becomes high-impedance. See Table 15: Reset/Block Temporary Unprotect AC

characteristics, and Figure 13: Reset/Block Temporary Unprotect AC waveforms.

The use of an open-drain output allows the Ready/Busy pins from several memories to be

connected to a single pull-up resistor. A Low will then indicate that one, or more, of the

memories is busy.

2.0.10

Byte/Word Organization Select (BYTE)

The Byte/Word Organization Select pin is used to switch between the 8-bit and 16-bit Bus

modes of the memory. When Byte/Word Organization Select is Low, VIL, the memory is in 8-

bit mode, when it is High, VIH, the memory is in 16-bit mode.

2.0.11

VCC Supply Voltage

The VCC Supply Voltage supplies the power for all operations (Read, Program, Erase etc.).

The Command Interface is disabled when the VCC Supply Voltage is less than the Lockout

voltage, VLKO. This prevents Bus Write operations from accidentally damaging the data

during power up, power down and power surges. If the Program/Erase Controller is

programming or erasing during this time then the operation aborts and the memory contents

being altered will be invalid.

A 0.1µF capacitor should be connected between the VCC Supply Voltage pin and the VSS

Ground pin to decouple the current surges from the power supply. The PCB track widths

must be sufficient to carry the currents required during program and erase operations, ICC3.

2.0.12

VSS Ground

The VSS Ground is the reference for all voltage measurements.

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