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Configuration
CP321
Page 4 - 10
© 2003 Kontron Modular Computers GmbH
ID 24977, Rev. 02
4.3.4
Flash Bank Select Register
The Flash bank select register is used to select the appropriate soldered Flash bank. As 8-bit
wide Flash memory may only be accessed through a 512 kB window this is the only way to
address a larger size Flash memory. Using bits 0 to 3 (FBn), 16 Flash banks can be selected
(16x512 kB = 8 MB). The default value on startup of the CP321 is 0x00.
4.3.5
SRAM Bank Select Register
This register is for usage in conjunction with the memory expansion socket 2 and NVSRAM
Types DS1265Y or DS1270Y. Due to the fact that there is only a page size of 512 kB available
for the memory expansion socket 2, the additional address lines are provided by writing to the
bits 0 and 1 (SBn) of the register:
•
a 1 in bit 0 (SB0) provides address A19 for the NVSRAM,
•
a 1 in bit 1 (SB1) provides address A20 for the NVSRAM.
Table 4-7: Flash Bank Select Register
REGISTER NAME
FLASH BANK SELECT
ACCESS
ADDRESS
0xFFE0 0016
R
W
BIT POSITION
7
6
5
4
3
2
1
0
CONTENT
res.
res.
res.
res.
FB3
FB2
FB1
FB0
DEFAULT
n/a
n/a
n/a
n/a
0
0
0
0
Table 4-8: SRAM Bank Select Register
REGISTER NAME
SRAM BANK SELECT
ACCESS
ADDRESS
0xFFE0 0017
R
W
BIT POSITION
7
6
5
4
3
2
1
0
CONTENT
res.
res.
res.
res.
res.
res.
SB1
SB0
DEFAULT
n/a
n/a
n/a
n/a
n/a
n/a
0
0
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