HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 441
HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417320.pdf
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Section 9
Bus State Controller (BSC)
(11) Power-On Sequence
In order to use SDRAM, mode setting must first be performed after powering on. To perform
SDRAM initialization correctly, the bus state controller registers must first be set, followed by a
write to the SDRAM mode register. In SDRAM mode register setting, the address signal value at
that time is latched by a combination of the CSn, RAS, CAS, and RD/WR signals. If the value to
be set is X, the bus state controller provides for value X to be written to the SDRAM mode
register by performing a write to address H'A4FD4000 + X for area 2 SDRAM, and to address
H'A4FD5000 + X for area 3 SDRAM. In this operation the data is ignored, but the mode write is
performed as a byte-size access. To set burst read/single write, CAS latency 2 to 3, wrap type =
sequential, and burst length 1 supported by the LSI, arbitrary data is written in a byte-size access
to the addresses shown in table 9.19. In this time 0 is output at the external address pins of A12 or
later.
Rev. 3.00 Jan. 18, 2008 Page 379 of 1458
REJ09B0033-0300
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