CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
140
Bit Position
Bit Name
Function
Row Address Hold Wait Control
Specifies the number of wait states inserted as row address hold time.
RHC1n
RHC0n
Number of Wait States Inserted
0
0
0
0
1
1
1
0
2
1
1
3
11, 10
RHC1n,
RHC0n
Data Access Programmable Wait Control
Specifies the number of wait states inserted as data access time in DRAM access.
DAC1n
DAC0n
Number of Wait States Inserted
0
0
0
0
1
1
1
0
2
1
1
3
9, 8
DAC1n,
DAC0n
Column Address Pre-charge Control
Specifies the number of wait states inserted as column address precharge time.
CPC1n
CPC0n
Number of Wait States Inserted
0
0
0
Note
0
1
1
1
0
2
1
1
3
7, 6
CPC1n,
CPC0n
Note 1 wait is inserted during DRAM write access in DMA flyby transfer.
4
RHDn
RAS Hold Disable
Sets the RAS hold mode.
If access to DRAM during on-page operation is not continuous, and access enters
another space midway, the RASm signal (m = 0 to 7) is maintained in the active state
(low level) during the time the other space is being accessed in the RAS hold mode
state. In this way, if access continues in the same DRAM row address following access
of the other space, on-page operation can be continued.
0: RAS hold mode enabled
1: RAS hold mode disabled
Remark
n = 0 to 3
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