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H8SX1663 Scheda tecnica(PDF) 339 Page - Renesas Technology Corp

Il numero della parte H8SX1663
Spiegazioni elettronici  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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H8SX1663 Scheda tecnica(HTML) 339 Page - Renesas Technology Corp

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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 287 of 1102
REJ09B0294-0100
(3) When TRWL = 1
When the SDRAM interface is written to, one Trwl cycle is inserted after the Tc2 cycle. The
DACK signal stays asserted until the end of the Trwl cycle. The hold time of data output from an
external device can be extended by one cycle.
Figure 6.86 shows an output timing example of the
DACK signal when TRWL = 1 with DDS = 1
and DKC = 0.
T
p
T
r
T
c1
T
c2
T
rwl
T
c1
T
c2
T
rwl
SD
φ
Address bus
Row address
Column address 2
Column address 1
CS
Precharge-sel
RAS
CAS
WE
CKE
PALL ACTV NOP
NOP
WRIT
WRIT
NOP
DQMLU
DQMLL
D7 to D0
BS
DACK
RD/
WR
D15 to D8
Row
address
High
Figure 6.86 Output Timing Example of
DACK when TRWL = 1 (Write)



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