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H8SX/1663R bảng dữ liệu(PDF) 364 Page - Renesas Technology Corp

tên linh kiện H8SX/1663R
Giải thích chi tiết về linh kiện  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H8SX/1663R bảng dữ liệu(HTML) 364 Page - Renesas Technology Corp

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Section 9 Bus Controller (BSC)
Rev. 2.00 Sep. 24, 2008 Page 332 of 1468
REJ09B0412-0200
Some DRAMs with the self-refresh have a given time between cancellation of the self-refresh
mode and the subsequent command issued cycle. From one to seven of precharge cycles
immediately after cancellation of the self-refresh mode can be inserted. Normal precharge is also
performed according to bits TPC1 and TPC0 in DRACCR. Set the precharge time including the
normal precharge so that the precharge time immediately after a self-refresh cycle is optimal.
Figure 9.80 shows a timing example when one precharge cycle is added.
T
r
TR
p1
TR
c2
TR
c3
T
c1
T
c2
T
p
Address bus
Software
standby
SDRAM space write
Data bus
SDRAM
φ
CS
Precharge-sel
RAS
CAS
WE
PALL
ACTV
WRITE
NOP
NOP
DQMLU, DQMLL
CKE
BS
RD/
WR
Row address
Column address
Row
address
Figure 9.80 Timing Example when 1 Precharge Cycle Added in the
Software Standby Mode (TPCS2 to TPCS0 = H'1, TPC1 = 0, TPC0 = 0)



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