Section 12 DDR-SDRAM Interface (DDRIF)
Rev. 1.00 Oct. 01, 2007 Page 430 of 1956
REJ09B0256-0100
12.5 Operation
12.5.1 DDR-SDRAM
Access
The DDR-SDRAM is accessed with a burst length of 2. Read or write commands that hit the page
are issued continuously and read data continuously.
ACT
WR
Write command
Write data
WR
WR
WR
D
D
D
D
D
D
D
D
ACT
RD
read command
read data
RD
RD
RD
D
D
D
D
D
D
D
D
Figure 12.4 DDR-SDRAM Access
12.5.2 DDR-SDRAM
Initialization Sequence
Since the internal state of the DDR-SDRAM is undefined immediately after a power-on, initialize
the SDRAM according to the following sequence. Otherwise the device may be damaged.
An example of the initialization sequence for the DDR-SDRAM is shown below. For details, see
each memory manufacturer's datasheet.
1. Turn on the four power supplies to the DDR-SDRAM in the following order: VDD, VDDQ,
VREF, and VTT.
2. After the power supply, reference voltage, and clock are stabilized, maintain the current state
for at least 200
µ
s.
3. Perform a dummy read to any DDR-SDRAM address.
4. Set MIM to enable the DDR-SDRAM controller, set the endian mode, and so on.
5. Set SDR and STR.
6. Use the SMS field in SCR to enable the CKE pin.
7. Use the SMS field in SCR to issue the all-bank precharge (PREALL) command.
8. Use SDMR to issue the EMRS command and enable the DLL.
Summary of Contents for SH7763
Page 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Page 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Page 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Page 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Page 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Page 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Page 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Page 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Page 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Page 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Page 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Page 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Page 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Page 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Page 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Page 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Page 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Page 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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