MB91F467BA datasheet(51/127 Pages) CYPRESS

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MB91460B Series

Document Number: 002-04608 Rev. *A

Page 50 of 126

9.5

Poweron Sequence in Parallel Programming Mode

The flash memory can be accessed in programming mode after a certain wait time, which is needed for Security Vector fetch:

■ Minimum wait time after VDD5/VDD5R power on: 2.76 ms

■ Minimum wait time after INITX rising: 1.0 ms

9.6

Flash Security

9.6.1

Vector Addresses

Two Flash Security Vectors (FSV1, FSV2) are located parallel to the Boot Security Vectors (BSV1, BSV2) controlling the protection

functions of the Flash Security Module:

FSV1: 0x14:8000

BSV1: 0x14:8004

FSV2: 0x14:8008

BSV2: 0x14:800C

9.6.2

Security Vector FSV1

The setting of the Flash Security Vector FSV1 is responsible for the read and write protection modes and the individual

write protection of the 8 KBytes sectors.

9.6.2.1 FSV1 (bit31 to bit16)

The setting of the Flash Security Vector FSV1 bits [31:16] is responsible for the read and write protection modes.

Table 2. Explanation of the bits in the Flash Security Vector FSV1[31:16]

FSV1[31:19]

FSV1[18]

Write Protection

Level

FSV1[17]

Write Protection

FSV1[16]

Read Protection

Flash Security Mode

set all to ‘0’

set to ‘0’

set to ‘1’

Read Protection (all device modes, except INTVEC

mode MD[2:0]=”000”)

set all to ‘0’

set to ‘0’

set to ‘1’

set to ‘0’

Write Protection (all device modes, without

exception)

set all to ‘0’

set to ‘0’

set to ‘1’

Read Protection (all device modes, except INTVEC

mode MD[2:0]=”000”) and Write Protection

(all device modes)

set all to ‘0’

set to ‘1’

set to ‘0’

set to ‘1’

Read Protection (all device modes, except INTVEC

mode MD[2:0]=”000”)

set all to ‘0’

set to ‘1’

set to ‘0’

Write Protection (all device modes, except INTVEC

mode MD[2:0]=”000”)

set all to ‘0’

set to ‘1’

Read Protection (all device modes, except INTVEC

mode MD[2:0]=”000”) and Write Protection

(all device modes except INTVEC mode

MD[2:0]=”000”)

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