SH7032 Datasheet, PDF (163/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 8 Bus State Controller (BSC)
Area 6: Area 6 is an area with address bits A26–A24 set to 110 and an address range of
H'6000000–H'6FFFFFF and H'E000000–H'EFFFFFF. Figure 8.9 shows a memory map of area 6.
In area 6, a space for which address bit A27 is 0 is allocated to address/data multiplexed I/O space
when the multiplexed I/O enable bit (IOE) of the bus control register (BCR) is 1, and to external
memory space when the IOE bit is 0. When A27 is 1, it is always external memory space.
The multiplexed I/O space is a type of external memory space but the address and data are
multiplexed and output from AD15–AD0 or AD7–AD0. The bus width is 8 bits when the A14 bit
is 0 and 16 bits when the A14 bit is 1. The A23 and A22 bits are not output and the shadow is in 4-
Mbyte units. When multiplexed I/O space is accessed, the CS6 signal is valid.
In external memory space, the bus width is 8 bits when both the A27 and A14 bits are 0 and 16
bits when the A27 bit is 0 and the A14 bit is 1. When the A27 bit is 1, it is always a 16-bit space.
The A23 and A22 bits are not output and the shadow is in 4-Mbyte units. When external memory
is accessed, the CS6 signal is valid. The external memory space has a long wait function so
between 1 and 4 states can be selected for the number of long waits inserted into the bus cycle
using the area 6 long wait insertion bits (A6LW1 and A6LW0) in WCR3.
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
Rev. 7.00 Jan 31, 2006 page 137 of 658
REJ09B0272-0700