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Bus Controller (BC)
8-63
■
Minimum value for the RAS Precharge interval
When consecutive DRAM accesses are performed, the RAS precharge interval is shortest when performing an
access of type (1) or (2) below while the PAGE bit is set to “0” in the DRAM control register:
(1) Word/half-word access while the bus width is set to 8 bits
(2) Word access while the bus width is set to 16 bits
Because the minimum value for the RAS precharge interval is:
RP + ASR
as shown in Fig. 8-14-2, set the parameters RP and ASR to values that will satisfy the DRAM requirements. Note
that the minimum value that can be set for both RP and ASR is 1.
Fig. 8-14-2
Case Where the RAS Precharge Interval is at Its Minimum
(Example Where RP = 1 and ASR = 1)
ASR
CAO
RASn
CAS
ASC
RSH
Lower byte read
or
lower byte write
An
Column
Column
Row
Row
MCLK
RP
ASR
CAO
ASC
RSH
RE
CAS
CAS
Upper byte read
or
upper byte write
Dn
Dn
WEn
WEN
WEN
During reading
During writing
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 ...