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SH7713 bảng dữ liệu(PDF) 436 Page - Renesas Technology Corp

tên linh kiện SH7713
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Section 12 Bus State Controller (BSC)
Rev.1.50 Aug. 30, 2006 Page 396 of 860
REJ09B0288-0150
12.5.3
Access Wait Control
Wait cycle insertion on a normal space access can be controlled by the settings of bits WR3 to
WR0 in CSnWCR. It is possible for areas 4, 5A, and 5B to insert wait cycles independently in
read access and in write access. The areas other than 4, 5A, and 5B have common access wait for
read cycle and write cycle. The specified number of Tw cycles is inserted as wait cycles in a
normal space access shown in figure 12.9.
T1
CKIO
A25 to A0
CSn
RD/
WR
RD
D31 to D0
D31 to D0
WEn(BEn)
BS
Tw
Read
Write
T2
DACKn*
Note: * The waveform for DACKn is when active low is specified.
Figure 12.9 Wait Timing for Normal Space Access (Software Wait Only)
When the WM bit in CSnWCR is cleared to 0, the external wait input
WAIT signal is also
sampled.
WAIT pin sampling is shown in figure 12.10. A 2-cycle wait is specified as a software
wait. The
WAIT signal is sampled on the falling edge of CKIO at the transition from the T1 or Tw
cycle to the T2 cycle.



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