Section 7 Bus State Controller (BSC)
Rev. 2.00 Mar 09, 2006 page 330 of 906
REJ09B0292-0200
the burst enable bit (BE) in MCR. Figure 7.43 shows the timing of burst access in high-speed page
mode. When performing burst access, cycles can be inserted using the wait state control function.
An address comparator is provided to detect matches of row addresses in burst mode. When this
function is used and the BE bit in MCR is set to 1, setting the MCR’s RASD bit (which specifies
RAS
down mode) to 1 places the SH7616 in
RAS
down mode, which leaves the
RAS
signal
asserted. The access timing in
RAS
down mode is shown in figures 7.44 and 7.45. When
RAS
down mode is used, the refresh cycle must be less than the maximum DRAM
RAS
assert time
tRAS when the refresh cycle is longer than the tRAS maximum.
Tp
CKIO
A24–A16
A15–A1
RAS
CASn
RD/
WR
RD
D31–D0
RD/
WR
RD
D31–D0
DACKn
*
Read
Write
Tr
Tc1
Tc2
Tc1
Tc2
Note:
*
DACKn waveform when active-low is specified
Figure 7.43 Burst Access Timing
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...