UPSD3422_V01 datasheet(214/300 Pages) STMICROELECTRONICS

214 / 300 page

Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

PSD module

UPSD3422, UPSD3433, UPSD3434, UPSD3454

214/300

Figure 71.

Data polling flowchart

28.5.12

Data toggle

Checking the Toggle Flag Bit (DQ6) is another method of determining whether a program or

erase operation is in progress or has completed. Figure 72 shows the Data Toggle

algorithm.

When the 8032 issues a program instruction sequence, the embedded algorithm within the

Flash memory array begins. The 8032 then reads the location of the byte to be programmed

in Flash memory to check status. The Toggle Flag Bit (DQ6) of this location toggles each

time the 8032 reads this location until the embedded algorithm is complete. The 8032

continues to read this location, checking the Toggle Flag Bit (DQ6) and monitoring the Error

Flag Bit (DQ5). When the Toggle Flag Bit (DQ6) stops toggling (two consecutive reads yield

the same value), then the embedded algorithm is complete. If the Error Flag Bit (DQ5) is '1,'

the 8032 should test the Toggle Flag Bit (DQ6) again, since the Toggle Flag Bit (DQ6) may

have changed simultaneously with the Error Flag Bit (DQ5) (see Figure 72).

The Error Flag Bit (DQ5) is set if either an internal time-out occurred while the embedded

algorithm attempted to program the byte, or if the 8032 attempted to program bit to logic ’1’

when that bit was already programmed to logic ’0’ (must erase to achieve logic ’1’).

It is suggested (as with all Flash memories) to read the location again after the embedded

programming algorithm has completed, to compare the byte that was written to Flash

memory with the byte that was intended to be written.

When using the Data Toggle method during an erase operation, Figure 72 still applies. the

Toggle Flag Bit (DQ6) toggles until the erase operation is complete. A ’1’ on the Error Flag

READ DQ5 & DQ7

at VALID ADDRESS

START

READ DQ7

FAIL

PASS

AI01369B

DQ7

DATA

YES

DQ5

= 1

DQ7

DATA

YES

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422 Datasheet(PDF) 214 Page - STMicroelectronics

UPSD3422 Datasheet(HTML) 214 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL