Datasheet

R01DS0098EJ0180 Rev.1.80 Page 77 of 208
May 13, 2014
RX63N Group, RX631 Group 3. Address Space
3.2 External Address Space
The external address space is classified into CS areas (CS0 to CS7) and SDRAM area (SDCS). CS areas can be divided
into up to eight areas (CS0 to SC7) corresponding to the CSn# signal to be output from the CSn# pin.
Figure 3.2 shows the address ranges corresponding to the individual CS areas (CS0 to CS7) and SDRAM area (SDCS)
in on-chip ROM disabled extended mode.
Figure 3.2 Correspondence between External Address Spaces and CS Areas
(In On-Chip ROM Disabled Extended Mode)
Reserved area*
1
Reserved area*
1
Reserved area*
1
0000 0000h
0008 0000h
RAM
External address space
(CS area)
0010 0000h
Peripheral I/O registers
0100 0000h
0800 0000h
FF00 0000h
0004 0000h
External address space
(CS area)*
2
0100 0000h
0200 0000h
0300 0000h
0400 0000h
0500 0000h
0600 0000h
0700 0000h
CS7 (16 Mbytes)
01FF FFFFh
02FF FFFFh
03FF FFFFh
04FF FFFFh
05FF FFFFh
06FF FFFFh
07FF FFFFh
CS6 (16 Mbytes)
CS5 (16 Mbytes)
CS4 (16 Mbytes)
CS3 (16 Mbytes)
CS2 (16 Mbytes)
CS1 (16 Mbytes)
FFFF FFFFh
FFFF FFFFh
FF00 0000h
CS0 (16 Mbytes)
Note 1. Reserved areas should not be accessed.
Note 2. The CS0 area is disabled in on-chip ROM enabled extended mode.
In this mode, the address space for addresses above 1000 0000h is as shown in figure on
this section, Memory Map in Each Operating Mode.
External address space
(SDRAM area)
1000 0000h
0FFF FFFFh
0800 0000h
SDCS (128 Mbytes)