SH7032 Datasheet, PDF (159/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 8 Bus State Controller (BSC)
Logical address space
H'8000000
H'800FFFF
H'8010000 ^H'0000000
H'000FFFF
H'0010000
Shadow
Shadow
Shadow
H'8FF0000
H'8FFFFFF
H'0FF0000
H'0FFFFFF
Shadow
Shadow
Shadow
32-bit space 32-bit space
MD2–MD0 = 010
Logical address space
H'8000000
H'0000000
H'83FFFFF
H'8400000
H'03FFFFF
H'0400000
Shadow
H'87FFFFF
Actual space H'8800000
On-chip ROM
(64 kbytes)
H'07FFFFF
H'0800000
• Valid
addresses
A15–A0
(A23–A16
ignored)
• CS0 not
valid
• On-chip
ROM
space
valid in
SH7034
only
H'8BFFFFF
H'8C00000
H'0BFFFFF
H'0C00000
H'8FFFFFF
H'0FFFFFF
8 or 16
bit space
Shadow
Shadow
Shadow
8 or 16
bit space
Actual space
External
memory
space
(4 Mbytes)
• MD2–MD0 =
000: 8-bit
access,
001: 16-bit
access
• Valid
addresses
A21–A0
(A23 and
A22 not
output)
• CS0 valid
• Long wait
function
MD2–MD0 = 000 or 001
Note: The bus width of area 0 is determined by the MD2-MD0 pins regardless of the A27 bit setting.
Figure 8.5 Memory Map of Area 0
Area 1: Area 1 is an area with address bits A26–A24 set to 001 and an address range of
H'1000000–H'1FFFFFF and H'9000000–H'9FFFFFF. Figure 8.6 shows a memory map of area 1.
Area 1 can be set for use as DRAM space or external memory space with the DRAM enable bit
(DRAME) in the bus control register (BCR). When the DRAME bit is 0, area 1 is external
memory space; when DRAME is 1, it is DRAM space.
In external memory space, the bus width is 8 bits when the A27 bit is 0 and 16 bits when it is 1.
Bits A23 and A22 are not output and the shadow is in 4-Mbyte units. When external memory is
accessed, the CS1 signal is valid.
DRAM space is a type of external memory space, but it is configured especially to be connected to
DRAM, so it outputs strobe signals required for this purpose. The access size is 8 bits when
Rev. 7.00 Jan 31, 2006 page 133 of 658
REJ09B0272-0700