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H8SX1663 bảng dữ liệu(PDF) 313 Page - Renesas Technology Corp

tên linh kiện H8SX1663
Giải thích chi tiết về linh kiện  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 261 of 1102
REJ09B0294-0100
6.11.7
Controlling Row Address Output Cycle
When the time between the ACTV command and the subsequent READ or WRIT command does
not meet a given specification, the Trw cycle in which the NOP command is output can be
inserted for one to three cycles between the Tr cycle in which the ACTV command is output and
the Tc1 cycle in which the column address is output. Set the bit according to the SDRAM to be
used and the frequency of this LSI so that the number of wait cycles can be optimal.
Figures 6.63 and 6.64 show a timing example when the one Trw cycle is inserted.
T
p
T
r
T
rw
T
c1
T
cl
T
c2
Address bus
Row address
Column address
SD
φ
CS
Precharge-sel
RAS
CAS
WE
CKE
PALL
ACTV
READ
NOP
NOP
DQMLU
DQMLL
D7 to D0
BS
RD/
WR
D15 to D8
Row
address
High
Figure 6.63 Read Timing Example of Row Address Output Retained for 1 Clock Cycle
(RCD1 = 0, RCD0 = 1, CAS Latency = 2)



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