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H8SX/1663M データシート(PDF) 350 Page - Renesas Technology Corp

部品番号 H8SX/1663M
部品情報  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1504 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/1663M データシート(HTML) 350 Page - Renesas Technology Corp

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Section 9 Bus Controller (BSC)
Rev. 2.00 Sep. 24, 2008 Page 318 of 1468
REJ09B0412-0200
9.11.10
Controlling Write-Precharge Delay
In an SDRAM write cycle, a certain time is required until the write operation is completed inside
of the SDRAM. When the time between the WRIT command and the subsequent PALL command
does not meet a given specification, the Trwl cycle can be inserted for one cycle by the TRWL bit
in SDCR. Whether or not to insert the Trwl cycle depends on the SDRAM to be used and the
frequency of this LSI.
Figure 9.68 shows a timing example when one Trwl cycle is inserted.
T
p
T
r
T
rwl
T
c1
T
c2
Address bus
Row address
Column address
SDRAM
φ
CS
Precharge-sel
RAS
CAS
WE
CKE
PALL
ACTV
WRIT
NOP
NOP
DQMLU
DQMLL
D7 to D0
BS
RD/
WR
D15 to D8
Row
address
High
Figure 9.68 Write Timing Example when Write-Precharge Delay Cycle Insertion
(TRWL = 1)



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