HD6417727BP160CV Datasheet, PDF (221/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 6 X/Y Memory
The X/Y memory resides on the second 16 MB of physical address space area 1, from H'A500
0000 to H'A5FF FFFF. These 16-MB address spaces are shadowed and maps to the same 128-
kbyte X/Y ROM/RAM. Figures 6.1 and 6.2 show X/Y memory physical mapping.
MD = 1, DSP = 0
Privileged mode
MD = 0, DSP = 0
User mode
Same as SH-3
P0
In MD = 1, CPU can
change DSP bit
P1
P2
P3
P4
MD = 1, DSP = 1
Privileged DSP mode
Same as SH-3
U0
In MD = 0, user cannot
change DSP bit
Address error
MD = 0, DSP = 1
User DSP mode
In MD = 1, CPU can
P0
change DSP bit
X
Y
P1
Address range
P2
From H'A500 0000
P3
To H'A5FF FFFF
P4
U0
Address error
Address error
X
Y
Uxy: Address range
From H'A500 0000
To H'A5FF FFFF
Figure 6.1 X/Y Memory Logical Address Mapping
Rev.6.00 Mar. 27, 2009 Page 163 of 1036
REJ09B0254-0600