GE SBC330 3U VPX, Hardware Reference Manual

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64 SBC330 3U VPX Single Board Computer Publication No. SBC330-0HH/3
6.14 Flash Password Registers
There are two 32 ‐ bit Flash password registers, which store the 64 ‐ bit password
used to password ‐ lock sectors of the Spansion S29GL series Flash under software
control. The GEIP ‐ wide password is chosen to be the ASCII encoding of
‘DataSafe’. This password is only seen when software allows it and when the
jumper link (Flash_PW_LOCK) settings allow it. Otherwise, these registers
contain the ASCII code: ‘locklock’.
6.14.1 Flash password register 1
6.14.2 Flash password register 2
LAD Bit Reg Bit R/W Description Reset Value
15 0 R CPLD_JMP1 1 if jumper fitted
14 1 R CPLD_JMP2 1 if jumper fitted
13 2 R Flash_BOOT_SEC1 1 if jumper fitted
12 3 R Flash_BOOT_SEC2 1 if jumper fitted
11 4 R/W Core 1 boot
0 = Core 1 boots from same area
as core 0 (FF80000 to FFFFFFFF)
1 = Core 1 boots from FF000000 to
FF7FFFFF (lower 8 megs) 0 (both cores boot
from the same
location)
10 5 R/W Page Mode enable 0
9 6 R/W Page mode bit 0 0
8 7 R/W Page mode bit 1 0
7 8 R/W Page mode bit 2 0
6 9 R/W Page mode bit 3 0
Chip Select CS2
Offset 0x0048
Reset value Either 0x6C6F636B (‘lock’) or 0x44617461 (‘Data’)
Bits R/W Description
0 to 31 R Reads 0x6C6F636B (‘lock’) if the Flash password lock jumper is not
fitted or 0x44617461 (‘Data’) if fitted
Chip Select CS2
Offset 0x004C
Reset value Either 0x6C6F636B (‘lock’) or 0x53616665 (‘safe’)
Bits R/W Description
0 to 31 R Reads 0x6C6F636B (‘lock’) if the Flash password lock jumper is not
fitted or 0x53616665 (‘Safe’) if fitted