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H8SX1663 Folha de dados(PDF) 282 Page - Renesas Technology Corp

Nome de Peças H8SX1663
Descrição Electrónicos  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 230 of 1102
REJ09B0294-0100
6.10.5
Basic Timing
Figure 6.38 shows a basic access timing of the DRAM space.
A basic bus cycle consists of four clock cycles: one precharge cycle (Tp), one row address output
cycle (Tr), and two column address output cycles (Tc1 and Tc2).
The
RD signal is output to DRAM as an OE signal on a DRAM access. When DRAM with the
EDO page mode function is in use, connect the
OE signal to the OE pin of the DRAM.
T
p
T
r
T
c1
T
c2
Address bus
Row address
Column address
B
φ
RAS
LUCAS
LLCAS
WE
OE (RD)
WE
OE (RD)
Data bus
High
High
Read
Write
Data bus
BS
RD/
WR
Figure 6.38 DRAM Basic Access Timing (RAS = 0 and CAST = 0)



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