UPSD3422_V01 datasheet(199/300 Pages) STMICROELECTRONICS

199 / 300 page

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Product(s)

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Product(s)

Obsolete

Product(s)

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Product(s)

UPSD3422, UPSD3433, UPSD3434, UPSD3454

PSD module

199/300

Table 159.

HDL statement example generated from PSDsoft express for memory

map

Figure 64.

PSDsoft express memory mapping

28.2.4

EEPROM emulation

EEPROM emulation is needed if it is desired to repeatedly change only a small number of

bytes of data in Flash memory. In this case EEPROM emulation is needed because

although Flash memory can be written byte-by-byte, it must be erased sector-by-sector, it is

not erasable byte-by-byte (unlike EEPROM which is written AND erased byte-by-byte). So

changing one or two bytes in Flash memory typically requires erasing an entire sector each

time only one byte is changed within that sector.

However, two of the 8 Kbyte sectors of Secondary Flash memory may be used to emulate

EEPROM by using a linked-list software technique to create a small data set that is

rs0

((address

≥ ^h0000) & (address ≤ ^h1FFF));

csiop

((address

≥ ^h2000) & (address ≤ ^h20FF));

fs0

((address

≥ ^h0000) & (address ≤ ^h3FFF));

fs1

((address

≥ ^h4000) & (address ≤ ^h7FFF));

fs2

((page == 0)

& (address

≥ ^h8000)

(address

≤ ^hBFFF));

fs3

((page == 0)

& (address

≥ ^hC000)

(address

≤ ^hFFFF));

fs4

((page == 1)

& (address

≥ ^h8000)

(address

≤ ^hBFFF));

fs5

((page == 1)

& (address

≥ ^hC000)

(address

≤ ^hFFFF));

fs6

((page == 2)

& (address

≥ ^h8000)

(address

≤ ^hBFFF));

fs7

((page == 2)

& (address

≥ ^hC000)

(address

≤ ^hFFFF));

csboot0 =

((address

≥ ^h8000) & (address ≤ ^h9FFF));

csboot1 =

((address

≥ ^hA000) & (address ≤ ^hBFFF));

csboot2 =

((address

≥ ^hC000) & (address ≤ ^hDFFF));

csboot3 =

((address

≥ ^hE000) & (address ≤ ^hFFFF));

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422 Datasheet(PDF) 199 Page - STMicroelectronics

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