Section 15 External CPU Interface (EXCPU)
Rev. 1.00 Oct. 01, 2007 Page 627 of 1956
REJ09B0256-0100
15.4 Operation
With this LSI, a CPU externally connected to the LSI (an external CPU) is allowed to access the
DDR-SDRAM space or internal registers of the LSI by using the MPX protocol.
The external CPU becomes ready to access the space in this LSI after this sequence: an access
request (
BREQ
) from the external CPU is accepted by the LBSC, the local bus is released, and an
access acknowledgement (
BACK
) is returned to the external CPU.
The EXCPU determines whether the access is to the DDR-SDRAM space or to an internal register
according to the CS signals (
EX_CS0
,
EX_CS1
) from the external CPU and performs processing
for the respective access.
In the case of access to the DDR-SDRAM space, the EXCPU implements access to the DDR-
SDRAM space in this LSI by converting the signal from the external CPU from the MPX protocol
to the SuperHyway bus protocol. In this process, data alignment conversion is performed with the
same endian as this LSI according to the access size from the external CPU.
(1) Space Accessible to the External CPU
The DDR-SDRAM space and internal registers of this LSI are accessible to the external CPU. The
space to be accessed is selected as shown below using the CS signals.
•
EX_CS0
:
DDR-SDRAM space (64 Mbytes)
•
EX_CS1
:
Internal registers of this LSI
For DDR-SDRAM space access, however, the size of the space that can be accessed by the
external CPU is 64 Mbytes while the entire DDR-SDRAM space in this LSI is 512 Mbytes. So,
access to the entire DDR-SDRAM space from the external CPU is enabled by the window
method. To access the entire DDR-SDRAM space in this LSI, first designate a 64-Mbyte access
space by the EXCMSETR register of the EXCPU, and then create an access to the DDR-SDRAM
space.
Содержание SH7763
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Страница 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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