MB91460C datasheet(38/106 Pages) CYPRESS

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Document Number: 002-04609 Rev. *A

Page 38 of 106

MB91460C Series

9.5 Power on 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.

FSV1 (bit31 to bit16)

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

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 IN-

TVEC mode MD[2:0]=”000”)

set all to ‘0’

set to ‘0’

set to ‘1’

set to ‘0’

Write Protection (all device modes, without ex-

ception)

set all to ‘0’

set to ‘0’

set to ‘1’

Read Protection (all device modes, except IN-

TVEC mode MD[2:0]=”000”) and Write Protec-

tion (all device modes)

set all to ‘0’

set to ‘1’

set to ‘0’

set to ‘1’

Read Protection (all device modes, except IN-

TVEC mode MD[2:0]=”000”)

set all to ‘0’

set to ‘1’

set to ‘0’

Write Protection (all device modes, except IN-

TVEC mode MD[2:0]=”000”)

set all to ‘0’

set to ‘1’

Read Protection (all device modes, except IN-

TVEC mode MD[2:0]=”000”) and Write Protec-

tion (all device modes except INTVEC mode

MD[2:0]=”000”)

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