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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
Содержание MN103001G/F01K
Страница 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Страница 2: ......
Страница 4: ......
Страница 6: ......
Страница 7: ...14 A D Converter 15 I O Ports 16 Internal Flash Memory 17 Ordering Mask ROM Appendix 14 15 16 17 ...
Страница 8: ......
Страница 9: ...Table of Contents List of Figures and Tables 0 ...
Страница 26: ...xviii ...
Страница 27: ...1 0 1 General Specifications ...
Страница 35: ...2 CPU 2 ...
Страница 57: ...3 Extension Instruction Specifications 3 ...
Страница 96: ...Extension Instruction Specifications 3 40 ...
Страница 97: ...4 Memory Modes 3 4 ...
Страница 102: ...Memory Modes 4 6 ...
Страница 103: ...5 Operating Mode 5 ...
Страница 107: ...6 Clock Generator 6 13 ...
Страница 111: ...7 Internal Memory 7 ...
Страница 114: ...Internal Memory 7 4 ...
Страница 115: ...8 Bus Controller BC 8 ...
Страница 189: ...9 Interrupt Controller 9 ...
Страница 220: ...Interrupt Controller 9 32 ...
Страница 221: ...10 8 bit Timers 9 10 ...
Страница 254: ...8 bit Timers 10 34 ...
Страница 255: ...11 16 bit Timers 11 ...
Страница 292: ...16 bit Timers 11 38 ...
Страница 293: ...12 Watchdog Timer 11 12 ...
Страница 302: ...Watchdog Timer 12 10 ...
Страница 303: ...13 Serial Interface 13 ...
Страница 354: ...Serial Interface 13 52 ...
Страница 355: ...14 A D Converter 14 ...
Страница 367: ...15 I O Ports 15 ...
Страница 431: ...16 Internal Flash Memory 16 ...
Страница 439: ...17 17 Ordering Mask ROM ...
Страница 442: ...Ordering Mask ROM 17 4 ...
Страница 443: ...Appendix ...