Rev. 2.00, 09/03, page 175 of 690
Bit
Bit
Name
Initial
Value
R/W
Description
31 to 21
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
20
19
A2ROW1
A2ROW0
0
0
R/W
R/W
Number of Bits of Row Address for Area 2
Specifies the number of bits of row address for area 2.
00: 11 bits
01: 12 bits
10: 13 bits
11: Setting prohibited
18
0
R
Reserved
This bit is always read as 0. The write value should always be
0.
17
16
A2COL1
A2COL0
0
0
R/W
R/W
Number of Bits of Column Address for Area 2
Specifies the number of bits of column address for area 2.
00: 8 bits
01: 9 bits
10: 10 bits
11: Setting prohibited
15 to 13
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
12
SLOW
0
R/W
Low-Frequency Mode
Specifies the output timing of command, address, and write
data for SDRAM and the latch timing of read data from
SDRAM. Setting this bit makes the hold time for command,
address, write and read data extended. This mode is suitable
for SDRAM with low-frequency clock.
0: Command, address, and write data for SDRAM is output at
the rising edge of CKIO. Read data from SDRAM is
latched at the rising edge of CKIO.
1: Command, address, and write data for SDRAM is output at
the falling edge of CKIO. Read data from SDRAM is
latched at the falling edge of CKIO.
Содержание SH7705
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