13-14
MB86R02 ‘Jade-D’ Hardware Manual V1.64
13.6.9 DRAM CTRL REFRESH register (DRCR)
This register sets auto. refresh occurrence interval to DRAM. After changing this register value,
refresh occurs irregularly.
Address
F300_0000
H
+ 0E
H
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
-
-
-
-
-
-
-
CNTLD
REF_CNT
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
R/W
Initial value
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
Bit field
Description
No.
Name
15-9
(Reserved)
Reserved bits.
Write access is ignored.
8
CNTLD
Counter load.
REF_CNT value is forcibly loaded into internal counter.
When this bit is set to 0
→
1, REF_CNT value of bit[7:0] is forcibly loaded into internal
refresh counter.
This is used when setting value needs to be applied, such as after REF_CNT value
change. This bit does not need to be rewritten to 0 immediately after loaded because
it is performed after detecting the bit change. However, this bit keeps the writing
value. If bit value is not 0 at executing load operation, "1" should be written after
writing "0".
Although CNTLD is not used after REF_CNT change, it operates with the changed
REF_CNT by having the period before setting REF_CNT.
7-0
REF_CNT
Refresh count.
Auto. refresh request occurrence is set in 16 cycle.
00
H
Refresh request is continuously issued. Priority of refresh is higher
than the read/write. Although access request to DRAM occurs, only
refresh occurs with this setting.
01
H
- FF
H
Refresh request occurs in REF_CNT
×
16 clock interval. If DRAM
data is accessed at refresh request, refresh does not start until the
access is completed.
Summary of Contents for MB86R02
Page 24: ...MB86R02 Jade D Hardware Manual V1 64 ...
Page 76: ...3 2 MB86R02 Jade D Hardware Manual V1 64 Figure 3 1 Memory map 1 ...
Page 77: ...3 3 MB86R02 Jade D Hardware Manual V1 64 Figure 3 2 Memory map 2 ...
Page 167: ...8 8 MB86R02 Jade D Hardware Manual V1 64 ...
Page 214: ...11 7 MB86R02 Jade D Hardware Manual V1 64 15 16 cycles initial value ...
Page 497: ...18 139 MB86R02 Jade D Hardware Manual V1 64 VSYNC is output 1 dot clock faster than HSYNC ...
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Page 682: ...22 2 MB86R02 Jade D Hardware Manual V1 00 FUJITSU PROPRIETARY AND CONFIDENTIAL ...
Page 811: ...29 24 MB86R02 Jade D Hardware Manual V1 64 ...