MB91F467BA datasheet(52/127 Pages) CYPRESS

52 / 127 page

MB91460B Series

Document Number: 002-04608 Rev. *A

Page 51 of 126

9.6.2.2 FSV1 (bit15 to bit0) MB91F467BA/466BA

The setting of the Flash Security Vector FSV1 bits [15:0] is responsible for the individual write protection of the 8 KBytes sectors. It

is only evaluated if write protection bit FSV1[17] is set.

Table 3. Explanation of the bits in the Flash Security Vector FSV1[15:0]

Note: It is mandatory to always set the sector where the Flash Security Vectors FSV1 and FSV2 are located to write protected (here

sector SA4). Otherwise it is possible to overwrite the Security Vector to a setting where it is possible to either read out the Flash

content or manipulate data by writing. See section “Flash access in CPU mode” for an overview about the sector organisation of the

Flash Memory.

9.6.2.3 FSV1 (bit15 to bit0) MB91F465BB/464BB

The setting of the Flash Security Vector FSV1 bits [15:0] is responsible for the individual write protection of the 8 KBytes sectors. It

is only evaluated if write protection bit FSV1[17] is set.

Table 4. Explanation of the bits in the Flash Security Vector FSV1[15:0]

Note: It is mandatory to always set the sector where the Flash Security Vectors FSV1 and FSV2 are located to write protected (here

sector SA4). Otherwise it is possible to overwrite the Security Vector to a setting where it is possible to either read out the Flash

content or manipulate data by writing. See section “Flash access in CPU mode

” for an overview about the sector organisation of the

Flash Memory.

FSV1 bit

Sector

Enable Write

Protection

Disable Write

Protection

Comment

FSV1[0]

SA0

set to “0”

set to “1”

FSV1[1]

SA1

set to “0”

set to “1”

FSV1[2]

SA2

set to “0”

set to “1”

FSV1[3]

SA3

set to “0”

set to “1”

FSV1[4]

SA4

set to “0”



Write protection is manda-

tory!

FSV1[5]

SA5

set to “0”

set to “1”

FSV1[6]

SA6

set to “0”

set to “1”

FSV1[7]

SA7

set to “0”

set to “1”

FSV1[15:8]





not available

FSV1 bit

Sector

Enable Write

Protection

Disable Write

Protection

Comment

FSV1[3:0]





not available

FSV1[4]

SA4

set to “0”

—

Write protection is manda-

tory!

FSV1[5]

SA5

set to “0”

set to “1”

FSV1[6]

SA6

set to “0”

set to “1”

FSV1[7]

SA7

set to “0”

set to “1”

FSV1[15:8]





not available

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