CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
173
User’s Manual U14359EJ4V0UM
Address
FFFFF49EH
7
RRW1
RWC
6
RRW0
5
RCW2
4
RCW1
3
RCW0
2
SRW2
1
SRW1
0
SRW0
After reset
00H
Bit position
Bit name
Function
Refresh RAS Wait Control
Specifies the number of wait states inserted as hold time for the RASm signal's high level
width during CBR refresh (m = 1, 3, 4, 6).
RRW1
RRW0
Number of inserted wait states
0
0
0
0
1
1
1
0
2
1
1
3
7, 6
RRW1,
RRW0
Refresh Cycle Wait Control
Specifies the number of wait states inserted as hold time for the RASm signal's low level
width during CBR refresh (m = 1, 3, 4, 6).
RCW2
RCW1
RCW0
Number of inserted wait states
0
0
0
1 (at least 1 wait is always inserted)
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
5 to 3
RCW2 to
RCW0
Self-refresh Release Wait Control
Specifies the number of wait states inserted as CBR self-refresh release time.
SRW2
SRW1
SRW0
Number of inserted wait states
0
0
0
0
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
2 to 0
SRW2 to
SRW0