HD6417616 RENESAS [Renesas Technology Corp], HD6417616 Datasheet - Page 359
HD6417616
Manufacturer Part Number
HD6417616
Description
32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417616.pdf
(935 pages)
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The EDO mode bit (EDO) in MCR allows selection of ordinary access/high-speed page mode
burst access or ordinary access/burst access using EDO mode. Since OE control is performed in
EDO mode DRAM access, the CAS and OE pins of the SH7616 must be connected to the OE pin
of the DRAM.
Ordinary access in EDO mode is shown in figure 7.48, and burst access in figure 7.49.
In EDO mode, in order to extend the timing for data output to the data bus in a read cycle until the
next assertion of CASn, the DRAM access time can be increased by delaying the data latch timing
by 1/2 cycle, making it at the rise of the CKIO clock.
Figure 7.46 Example of EDO DRAM Connection (32-Bit Data Width)
Chip
CAS/OE
RD/WR
CAS3
CAS2
CAS1
CAS0
RAS
D31
D16
D15
A10
D0
A2
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Rev. 2.00 Mar 09, 2006 page 333 of 906
Section 7 Bus State Controller (BSC)
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256 k
A8
A0
RAS
OE
WE
I/O15
I/O0
UCAS
LCAS
A8
A0
RAS
OE
WE
I/O15
I/O0
UCAS
LCAS
REJ09B0292-0200
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DRAM
16-bit
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