HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 142
HD6417021
Manufacturer Part Number
HD6417021
Description
SuperH RISC engine
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417021.pdf
(507 pages)
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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 HITACHI
H'6000000
H'63FFFFF
H'6400000
H'67FFFFF
H'6800000
H'6BFFFFF
H'6C00000
H'6FFFFFF
Logical address
8 or 16-bit
Shadow
Shadow
Shadow
Shadow
space
space
• IOE = 1:
• A14 = 0: 8-bit space
• Valid addresses
• CS6 valid
• Long wait function
Figure 8.9 Memory Map of Area 6
Multiplexed
or external
(4 Mbytes)
address/data
multiplexed I/O
space;
IOE = 0: external
memory space
A14 = 1: 16-bit space
A21–A0 (A23 and
A22 not output)
I/O space
memory
space
Actual
space
H'E000000
H'E3FFFFF
H'E400000
H'E7FFFFF
H'E800000
H'EBFFFFF
H'EC00000
H'EFFFFFF
Logical address
16-bit space
Shadow
Shadow
Shadow
Shadow
space
• Valid
• CS6 valid
• Long wait
(4 Mbytes)
addresses
A21–A0 (A23
and A22 not
output)
function
External
memory
Actual
space
space
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