R5F72115D160FPV datasheet(1012/1228 Pages) RENESAS

Part #	R5F72115D160FPV

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family

PDF	1228 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 22 On-Chip RAM

Rev. 2.00 May. 08, 2008 Page 988 of 1200

REJ09B0344-0200

22.2

Usage Notes

22.2.1

Page Conflict

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 or pages are accessed by

each bus.

22.2.2

RAME and RAMWE Bits

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. For setting the RAME and RAMWE

bits, see section 23.3.5, System Control Register 1 (SYSCR1), and section 23.3.6, System Control

R5F72115D160FPV Datasheet(PDF) 1012 Page - Renesas Technology Corp