HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 160

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 8 Bus State Controller (BSC)
address bit A27 is 0 and 16 bits when A27 is 1. When the multiplex enable bit (MXE) in the
DRAM control register (DCR) is set to 1 to use the address multiplex function, bits A23–A0 are
multiplexed and output from pins A15–A0, so a maximum 16-Mbyte space can be used. When
DRAM space is accessed, the CS1 signal is not valid and the pin function controller should be set
for access with CAS (CASH and CASL) and RAS signals.
Areas 2–4: Areas 2–4 are areas with address bits A26–A24 set to 010, 011, and 100, respectively,
and address ranges of H'2000000–H'2FFFFFF and H'A000000–H'AFFFFFF (area 2), H'3000000–
H'3FFFFFF and H'B000000–H'BFFFFFF (area 3), and H'4000000–H'4FFFFFF and H'C000000–
H'CFFFFFF (area 4). Figure 8.7 shows a memory map of area 2, which is representative of areas
2–4.
Rev. 7.00 Jan 31, 2006 page 134 of 658
REJ09B0272-0700
H'9BFFFFF
H'93FFFFF
H'97FFFFF
H'9FFFFFF
H'9C00000
H'9000000
H'9400000
H'9800000
16-bit space
H'1FFFFFF
DRAME = 0 or DRAME = 1, MXE = 0
H'1BFFFFF
H'13FFFFF
H'17FFFFF
H'1C00000
H'1000000
H'1400000
H'1800000
Logical address space
A27 = 1:
8-bit space
A27 = 0:
Shadow
Shadow
Shadow
Shadow
Figure 8.6 Memory Map of Area 1
• Valid
• CS1
Actual space
(4 Mbytes)
address
A21–A0
(A23 and
A22 not
output)
valid
External
memory
space
H'9FFFFFF
H'9000000
H'1FFFFFF
16-bit space
H'1000000
A27 = 1:
Logical address space
8-bit space
A27 = 0:
DRAME = 1
Shadow
• Multiplexed
• Not multi-
• CS1 not
Actual space
(MXE = 1):
16-bit space
plexed
(MXE = 0):
4-Mbyte
space
valid (CAS,
RAS output)
16 Mbytes)
(maximum
DRAM
space