Section 11 Local Bus State Controller (LBSC)
Rev.1.00 Dec. 13, 2005 Page 398 of 1286
REJ09B0158-0100
If a DMA transfer is executed for the space that the source address is in the LBSC space and the
destination address is out of the LBSC space and the LCKN bit in CHCR is cleared to 0, the bus is
not released after the DMA write access is ended even if the bus release signal (
BREQ
) is asserted.
And then execute read or write access to any address of the LBSC space from the CPU, the bus is
released after the access. This procedure does not need when the LCKN bit is set to 0.
If a DMA transfer is executed for the space that the source address is out of the LBSC space and
the destination address is in the LBSC space and the LCKN bit in CHCR is cleared to 0, the bus is
released in the cycle between read access and write access.
CSn
BREQ
BACK
DMAC CHCR LCKN = 0, Source address: LBSC space, Destination address: LBSC space
DMA read access
to the LBSC space
DMA write access
to the LBSC space
CSn
BREQ
BACK
DMAC CHCR LCKN = 0, Source address: LBSC space, Destination address: not LBSC space
DMA read access
to the LBSC space
CPU access
to the LBSC space
DMA write access
to other than the LBSC space
DMA read access
to other than the LBSC space
CSn
BREQ
BACK
DMAC CHCR LCKN = 0, Source address: not LBSC space, Destination address: LBSC space
DMA write access
to the LBSC space
Figure 11.36 Example of the Bus Release Restraint by the DMAC CHCR LCKN bit
Содержание SH7780 Series
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Страница 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Страница 1004: ...Section 24 Multimedia Card Interface MMCIF Rev 1 00 Dec 13 2005 Page 954 of 1286 REJ09B0158 0100 ...
Страница 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
Страница 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
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Страница 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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