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(4) Disappearing boot ROM
After boot sequence in BOOT mode, an application system program may continue to run
without reset asserting. In this case, an external memory which is mapped 3FE000H to
3FFFFFH address can not be accessed because of boot ROM is assigned.
To solve it, internal boot ROM can be disappered by setting BROMCR<ROMLESS> to
"1".
This <ROMLESS> is initialized to "0" in BOOT mode. At another starting mode, this bit
is initialized to "1".
If this bit has been set to "1", writing "0" is disabled.
BROMCR
Bit symbol
(016CH)
Read/Write
After Reset
Function
Note: The value after reset release is depending on start mode.
7
6
5
92CZ26A-201
4
3
2
CSDIS
1
Nand_Flash
area
CS output
0: Enable
1: Disable
TMP92CZ26A
1
0
ROMLESS
VACE
R/W
0/1 (note)
1/0 (note)
Boot ROM
Vector
0: use
address
1: not use
conversion
0: Disable
1: Enable
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