R5S72611 RENESAS [Renesas Technology Corp], R5S72611 Datasheet - Page 1156
R5S72611
Manufacturer Part Number
R5S72611
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5S72611.pdf
(1348 pages)
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Section 26 On-Chip RAM
26.2
26.2.1
When the same page is accessed from different buses simultaneously, a conflict on the page
occurs. Although each access is completed correctly, this kind of conflict degrades the memory
access speed. Therefore, it is advisable to provide software measures to prevent such conflicts as
far as possible. For example, no conflict will arise if different memory modules or different pages
are accessed by each bus.
26.2.2
Before disabling memory operation or write access through the RAME or RAMWE bit, be sure to
read from any address and then write to the same address in each page; otherwise, the last written
data in each page may not be actually written to the RAM.
Rev. 2.00 Sep. 07, 2007 Page 1124 of 1312
REJ09B0320-0200
// For RAM page 0
// For RAM page 1
Usage Notes
Page Conflict
RAME and RAMWE Bits
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
Figure 26.1 Examples of Read/Write before Disabling RAM
#H'FFF80000,R0
@R0,R1
R1,@R0
#H'FFF84000,R0
@R0,R1
R1,@R0
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