PSD4235G2V-10UI datasheet(30/100 Pages) STMICROELECTRONICS

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This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

Data Polling (DQ7) - DQ15 for Motorola

When erasing or programming in Flash memory,

the Data Polling Bit (DQ7/DQ15) outputs the com-

plement of the bit being entered for programming/

writing on the DQ7/DQ15 Bit. Once the Program

instruction or the WRITE operation is completed,

the true logic value is read on the Data Polling Bit

(DQ7/DQ15) (in a READ operation).

Data Polling is effective after the fourth WRITE

pulse (for a Program instruction) or after the

sixth WRITE pulse (for an Erase instruction). It

must be performed at the address being

programmed or at an address within the Flash

memory sector being erased.

During an Erase cycle, the Data Polling Bit

(DQ7/DQ15) outputs a ’0.’ After completion of

the cycle, the Data Polling Bit (DQ7/DQ15)

outputs the last bit programmed (it is a ’1’ after

erasing).

If the location to be programmed is in a

protected Flash memory sector, the instruction

is ignored.

If all the Flash memory sectors to be erased are

protected, the Data Polling Bit (DQ7/DQ15) is

reset to '0' for about 100µs, and then returns to

the value from the previously addressed

location. No erasure is performed.

Toggle Flag (DQ6) – DQ14 for Motorola

The PSD offers another way for determining when

the Flash memory Program cycle is completed.

During the internal WRITE operation and when ei-

ther FS0-FS15 or CSBOOT0-CSBOOT3 is true,

the Toggle Flag Bit (DQ6/DQ14) toggles from 0 to

’1’ and ’1’ to ’0’ on subsequent attempts to read any

word of the memory.

When the internal cycle is complete, the toggling

stops and the data read on the Data Bus D0-D7 is

the value from the addressed memory location.

The device is now accessible for a new READ or

WRITE operation. The cycle is finished when two

successive READs yield the same output data.

The Toggle Flag Bit (DQ6/DQ14) is effective

after the fourth WRITE pulse (for a Program

instruction) or after the sixth WRITE pulse (for

an Erase instruction).

If the location to be programmed belongs to a

protected Flash memory sector, the instruction

is ignored.

If all the Flash memory sectors selected for

erasure are protected, the Toggle Flag Bit

(DQ6/DQ14) toggles to '0' for about 100µs and

then returns to the value from the previously

addressed location.

Error Flag (DQ5) – DQ13 for Motorola

During a normal Program or Erase cycle, the Error

Flag Bit (DQ5/DQ13) is reset to ’0.’ This bit is set

to ’1’ when there is a failure during a Flash memory

Program, Sector Erase, or Bulk Erase cycle.

In the case of Flash memory programming, the Er-

ror Flag Bit (DQ5/DQ13) indicates the attempt to

program a Flash memory bit, or bits, from the pro-

grammed state, 0, to the erased state, ’1,’ which is

not a valid operation. The Error Flag Bit (DQ5/

DQ13) may also indicate a Time-out condition

while attempting to program a word.

In case of an error in a Flash memory Sector Erase

or Word Program cycle, the Flash memory sector

in which the error occurred or to which the pro-

grammed location belongs must no longer be

used. Other Flash memory sectors may still be

used. The Error Flag Bit (DQ5/DQ13) is reset after

a RESET instruction. A RESET instruction is re-

quired after detecting an error on the Error Flag Bit

(DQ5/DQ13).

Erase Time-out Flag (DQ3) – DQ11 for Motorola

The Erase Time-out Flag Bit (DQ3/DQ11) reflects

the time-out period allowed between two consecu-

tive Sector Erase instructions. The Erase Time-out

Flag Bit (DQ3/DQ11) is reset to ’0’ after a Sector

Erase cycle for a period of 100µs + 20% unless an

additional Sector Erase instruction is decoded. Af-

ter this period, or when the additional Sector Erase

instruction is decoded, the Erase Time-out Flag Bit

(DQ3/DQ11) is set to '1.'

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