HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 137
HD64F7050
Manufacturer Part Number
HD64F7050
Description
32-Bit RISC Microcomputer SuperH RISC engine Family/
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD64F7050.pdf
(841 pages)
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Bits 15–8—Idles between Cycles (IW31, IW30, IW21, IW20, IW11, IW10, IW01, IW00):
These bits specify idle cycles inserted between consecutive accesses when the second one is to a
different CS area after a read. Idles are used to prevent data conflict between ROM (and other
memories, which are slow to turn the read data buffer off), fast memories, and I/O interfaces. Even
when access is to the same area, idle cycles must be inserted when a read access is followed
immediately by a write access. The idle cycles to be inserted comply with the area specification of
the previous access Refer to section 10.6, Waits between Access Cycles, for details.
IW31, IW30 specify the idle between cycles for CS3 space; IW21, IW20 specify the idle between
cycles for CS2 space; IW11, IW10 specify the idle between cycles for CS1 space and IW01, IW00
specify the idle between cycles for CS0 space.
Bit 15: IW31
0
1
Bit 13: IW21
0
1
Bit 11: IW11
0
1
Bit 9: IW01
0
1
Bit 14: IW30
0
1
0
1
Bit 12: IW20
0
1
0
1
Bit 10: IW10
0
1
0
1
Bit 8: IW00
0
1
0
1
Description
No idle cycle after accessing CS3 space
Inserts one idle cycle
Inserts two idle cycles
Inserts three idle cycles initial value)
Description
No idle cycle after accessing CS2 space
Inserts one idle cycle
Inserts two idle cycles
Inserts three idle cycles initial value)
Description
No idle cycle after accessing CS1 space
Inserts one idle cycle
Inserts two idle cycles
Inserts three idle cycles initial value)
Description
No idle cycle after accessing CS0 space
Inserts one idle cycle
Inserts two idle cycles
Inserts three idle cycles initial value)
Rev. 5.00 Jan 06, 2006 page 117 of 818
Section 8 Bus State Controller (BSC)
REJ09B0273-0500
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