HD6417616 RENESAS [Renesas Technology Corp], HD6417616 Datasheet - Page 332
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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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Section 7 Bus State Controller (BSC)
7.5.7
A synchronous DRAM bank function is used to support high-speed accesses of the same row
address. When the RASD bit in MCR is set to 1, read/write accesses are performed using
commands without auto-precharge (READ, WRIT). In this case, even when the access is
completed, no precharge is performed. This function is not supported in the CS2 space. When the
bank active function is used, no precharge is performed when the access is completed. When
accessing the same row address in the same bank, a READ or WRIT command can be called
immediately without calling an ACTV command, just like the RAS down mode of the DRAM’s
high-speed page mode Synchronous DRAM is divided into two banks, so one row address in each
can stay active. When the next access is to a different row address, a PRE command is called first
to precharge the bank, and access is performed by an ACTV command and READ or WRIT
command in order, after the precharge is completed. With successive accesses to different row
Rev. 2.00 Mar 09, 2006 page 306 of 906
REJ09B0292-0200
CKIO
A24–A11
A10
A9–A1
CS2 or CS3
RAS
CAS
RD/WR
DQMxx
D31–D0
DACKn*
Note: * DACKn waveform when active-low is specified.
Figure 7.26 (b) Basic Burst Write Timing (Auto-Precharge) I : E = 1 : 1
Bank Active Function
Tr
Tc1
Tc2
Tc3
Tc4
Tde
Trwl
Tap
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