SH7020 Datasheet, PDF (144/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

Logical address
space
H'6000000
Logical address
space
H'E000000
Shadow
Shadow
H'63FFFFF
H'6400000
Shadow
H'67FFFFF
H'6800000
Shadow
H'6BFFFFF
H'6C00000
Shadow
H'6FFFFFF
8 or 16-bit
space
Actual
space
H'E3FFFFF
H'E400000
Actual
space
Multiplexed
I/O space
or external
memory
space
(4 Mbytes)
Shadow
H'E7FFFFF
H'E800000
External
memory
space
(4 Mbytes)
• IOE = 1:
Shadow _{• Valid}
address/data
addresses
multiplexed I/O
space;
H'EBFFFFF
H'EC00000
A21–A0 (A23
and A22 not
IOE = 0: external
output)
memory space
• A14 = 0: 8-bit space
Shadow
• CS6 valid
• Long wait
A14 = 1: 16-bit space
function
• Valid addresses
H'EFFFFFF
A21–A0 (A23 and
16-bit space
A22 not output)
• CS6 valid
• Long wait function
Figure 8.9 Memory Map of Area 6
Area 7: Area 7 is the area where addresses A26–A24 are 111 and its address range is H'7000000–
H'7FFFFFF and H'F000000–H'FFFFFFF. Figure 8.10 is a memory map of area 7.
Area 7 is allocated to external memory space when A27 is 0 and on-chip RAM space when A27 is
1. In external memory space, the bus width is 8 bits. The A23 and A22 bits are not output and the
shadow is in 4-Mbyte units. When external memory is accessed, the CS7 signal is valid.
The on-chip RAM space has an bus width of 32 bits. The on-chip RAM capacity is 1 kbytes, so
A23–A10 are ignored and the shadows are in 8-kbyte units. During on-chip RAM access, the CS7
signal is not valid.
126 RENESAS