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Bus Controller (BC)
8-22
8.6.5 DRAM control register
DRAM control register
Register symbol: DRAMCTR
Address:
x'32000040
Purpose:
Stores various DRAM mode settings when DRAM is connected.
Bit No.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit
–
–
–
–
RERS RERS RERS RERS SIZE SIZE
–
–
BWC REFE PAGE
DRAM
name
3
2
1
0
1
0
E
Reset
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
Access
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
R/W
R/W
Bit No.
Bit name
Description
Setting conditions
0
DRAME
DRAM control circuit enable
0: Disabled
1: Enabled
1
PAGE
Page mode enable
0: Disabled
1: Enabled
2
REFE
Refresh enable
0: Disabled
1: Enabled
3
BWC
Byte wide control
0: 2 WE control
1: 2 CAS control
7 to 6
SIZE1 to 0
DRAM size
00: Shift the address 9-bits to the low-order side and use as the row address
01: Shift the address 10-bits to the low-order side and use as the row address
10: Shift the address 11-bits to the low-order side and use as the row address
11: Shift the address 8-bits to the low-order side and use as the row address
11 to 8
RERS3 to 0
Number of MCLK while RAS is asserted
0000:
prohibited
in the refresh cycle.
0001:
1MCLK
1111:
15MCLK
For details on the RAS hold time, the RAS precharge cycle, the CAS pulse width, the row address setup timing, the
column address output timing, and the column address setup timing, refer to memory control registers 1A/B and
2A/B.
For the timing charts when using DRAM, refer to section 8.14, “External Memory Space Access (DRAM Spaces).”
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Summary of Contents for MN103001G/F01K
Page 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Page 2: ......
Page 4: ......
Page 6: ......
Page 8: ......
Page 9: ...Table of Contents List of Figures and Tables 0 ...
Page 26: ...xviii ...
Page 27: ...1 0 1 General Specifications ...
Page 35: ...2 CPU 2 ...
Page 57: ...3 Extension Instruction Specifications 3 ...
Page 96: ...Extension Instruction Specifications 3 40 ...
Page 97: ...4 Memory Modes 3 4 ...
Page 102: ...Memory Modes 4 6 ...
Page 103: ...5 Operating Mode 5 ...
Page 107: ...6 Clock Generator 6 13 ...
Page 111: ...7 Internal Memory 7 ...
Page 114: ...Internal Memory 7 4 ...
Page 115: ...8 Bus Controller BC 8 ...
Page 189: ...9 Interrupt Controller 9 ...
Page 220: ...Interrupt Controller 9 32 ...
Page 221: ...10 8 bit Timers 9 10 ...
Page 254: ...8 bit Timers 10 34 ...
Page 255: ...11 16 bit Timers 11 ...
Page 292: ...16 bit Timers 11 38 ...
Page 293: ...12 Watchdog Timer 11 12 ...
Page 302: ...Watchdog Timer 12 10 ...
Page 303: ...13 Serial Interface 13 ...
Page 354: ...Serial Interface 13 52 ...
Page 355: ...14 A D Converter 14 ...
Page 367: ...15 I O Ports 15 ...
Page 431: ...16 Internal Flash Memory 16 ...
Page 439: ...17 17 Ordering Mask ROM ...
Page 442: ...Ordering Mask ROM 17 4 ...
Page 443: ...Appendix ...