HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 165
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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8.4
In external memory space, a strobe signal is output based on the assumption of a directly
connected SRAM. The external memory space is allocated to the following areas:
8.4.1
The bus cycle for external memory space access is 1 or 2 states. The number of states is controlled
with wait states by the settings of wait state control registers 1–3 (WCR1–WCR3). For details, see
section 8.4.2, Wait State Control. Figures 8.11 and 8.12 illustrate the basic timing of external
memory space access.
Area 0 (when MD2–MD0 are 000 or 001)
Area 1 (when the DRAM enable bit (DRAME) in BCR is 0)
Areas 2–4
Area 5 (space where address bit A27 is 1)
Area 6 (when the multiplexed I/O enable bit (IOE) bit in BCR is 0, or space where address bit
A27 is 1)
Area 7 (space where address bit A27 is 0)
Figure 8.11 Basic Timing of External Memory Space Access (1-State Read Timing)
Accessing External Memory Space
Basic Timing
AD15–AD0
A21–A0
(Read)
(Read)
CSn
RD
CK
T1
Rev. 7.00 Jan 31, 2006 page 139 of 658
Section 8 Bus State Controller (BSC)
REJ09B0272-0700
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