Section 11 Direct Memory Access Controller (DMAC)
Rev. 2.00 Mar 09, 2006 page 502 of 906
REJ09B0292-0200
When external memory is set as bank active synchronous DRAM, during a single read the
acknowledge signal is output across the read command, wait and read address when the row
address is the same as the previous address output (figure 11.24). When the row address is
different from the previous address, the acknowledge signal is output across the precharge, row
address, read command, wait and read address (figure 11.25). Since the synchronous DRAM read
has only burst mode, during a single read an invalid address is output; the acknowledge signal is
output on the same timing. At this time, the acknowledge signal is extended until the write address
is output after the invalid read.
Clock
DACKn
(Active high)
Address
bus
CPU
Read
Invalid read
DMAC read (basic timing)
DMAC write (basic timing)
Read
command
Row
address
Column
address
Figure 11.24 DACKn Output in Synchronous DRAM Single Read
(Bank Active, Same Row Address, AM = 0)
Clock
DACKn
(Active high)
Address
bus
CPU
Invalid read
DMAC read
(basic timing)
DMAC write
(basic timing)
Row
address
Read
command
Row
address
Column
address
Pre-
charge
Read
Figure 11.25 DACKn Output in Synchronous DRAM Single Read
(Bank Active, Different Row Address, AM = 0)
Содержание SH7616
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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 ...