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H8SX/1663 データシート(PDF) 290 Page - Renesas Technology Corp

部品番号 H8SX/1663
部品情報  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX/1663 データシート(HTML) 290 Page - Renesas Technology Corp

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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 238 of 1102
REJ09B0294-0100
6.10.10
Controlling Byte and Word Accesses
When 16-bit bus DRAM is used, two CAS signals can be used to control byte and word accesses.
Figures 6.45 and 6.46 show control timing examples with use of two CAS signals (in big endian
format). Figure 6.47 shows an example of connection for control with two CAS signals.
T
p
T
r
T
c1
T
c2
B
φ
Address bus
RAS
LUCAS
LLCAS
WE
OE (RD)
D15 to D8
D7 to D0
High
Row address
Column address
BS
RD/
WR
Figure 6.45 Timing Example of Byte Control with Use of Two CAS Signals
(Write Access with Lowest Bit of Address = B'0, RAST = 0, CAST = 0)



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