M29DW128F datasheet(16/93 Pages) STMICROELECTRONICS

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2 Signal descriptions

M29DW128F

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Holding RP at VID will temporarily unprotect all the blocks previously protected using a High

Voltage Block Protection technique. Program and erase operations on all blocks will be

possible. The transition from VIH to VID must be slower than tPHPHH.

2.10

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 30: Reset/Block Temporary Unprotect AC Characteristics

and Figure 18 and Figure 19.

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.

2.11

Byte/Word Organization Select (BYTE)

It is used to switch between the x8 and x16 Bus modes of the memory when the M29DW128F

is delivered in TSOP56 package. When Byte/Word Organization Select is Low, VIL, the memory

is in x8 mode, when it is High, VIH, the memory is in x16 mode.

2.12

VCCQ Supply Voltage

VCCQ provides the power supply to the I/O and control pins and enables all Outputs to be

powered independently from VCC. VCCQ can be tied to VCC or can use a separate supply.

2.13

VCC Supply Voltage (2.7V to 3.6V)

VCC provides the power supply for all operations (Read, Program and Erase).

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, ICC2.

2.14

VSS Ground

VSS is the reference for all voltage measurements. The device features two VSS pins both of

which must be connected to the system ground.

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