15-41
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
QSPI Ch.
n
Memory Mapped Access Configuration Register 2
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
QSPI_
n
MMACFG2
15
–
12
DUMDL[3:0]
0x7
H0
R/W
–
11
–
8
DUMLN[3:0]
0x7
H0
R/W
7
–
6
DATTMOD[1:0]
0x0
H0
R/W
5
–
4
DUMTMOD[1:0]
0x0
H0
R/W
3
–
2
ADRTMOD[1:0]
0x0
H0
R/W
1
ADRCYC
0
H0
R/W
0
MMAEN
0
H0
R/W
Bits 15
–
12 DUMDL[3:0]
These bits set the number of clocks for driving the serial data lines during the dummy
cycle output when accessing the external Flash memory in the memory mapped access
mode. This setting is required to output the XIP confirmation bit to Micron Flash
memories or to output the mode byte to Spansion Flash memories.
Table 15.8.5 Settings of Data Line Drive Length during Dummy Cycle
QSPI_
n
MMACFG2.DUMDL[3:0] bits
Data line drive length
0xf
16 clocks
0xe
15 clocks
0xd
14 clocks
0xc
13 clocks
0xb
12 clocks
0xa
11 clocks
0x9
10 clocks
0x8
9 clocks
0x7
8 clocks
0x6
7 clocks
0x5
6 clocks
0x4
5 clocks
0x3
4 clocks
0x2
3 clocks
0x1
2 clocks
0x0
1 clock
These bits must be set to a value smaller than or equal to the
QSPI_
n
MMACFG2.DUMLN[3:0] bit setting.
Summary of Contents for S1C31D50
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Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...