Section 12 DDR-SDRAM Interface (DDRIF)
Rev. 1.00 Oct. 01, 2007 Page 436 of 1956
REJ09B0256-0100
12.5.11 Note on Setting Auto-Refresh Interval
The auto-refresh interval is specified by the DRI bits in MIM. If the DRE bit is set to 1 at the same
time as the DRI bits are set, the time until the first auto-refresh is that selected by the value of the
DRI bits before the new setting was made. However, the second and subsequent auto-refresh
intervals take on the value corresponding to the new setting for the DRI bits. To avoid this
situation, clear the DRE bit to 0 when setting the DRI bits. When the DRE bit is subsequently set
to 1, auto-refreshing proceeds with the specified interval from the first round. When writing 1 to
the DRE bit, the previously written cycle number should be set to the DRI bits.
12.5.12 Address
Multiplexing
Address multiplexing is performed so that the DDR-SDRAM is connected without the external
address multiplexing circuit according to the setting of the BW bits in MIM and the SPLIT bits in
SDR. Table 12.7 shows the relationship between the DDR-SDRAM bus width and the addresses
that are output to the address pins according to the setting of the SPLIT bits. If a setting not
specified in table 12.7 is used, correct operation is not guaranteed.
Table 12.7 DDR-SDRAM Address Multiplexing (32-Bit Data Bus)
SPLIT[3:0] ROW × COL
M_
BA1
M_
BA0
M_
A13
M_
A12
M_
A11
M_
A10
M_
A9
M_
A8
M_
A7
M_
A6
M_
A5
M_
A4
M_
A3
M_
A2
M_
A1
M_
A0
128 M bits × 2
0001
12 × 9
ROW
13
12
— — 11 24 23 22 21 20 19 18 17 16 15 14
(8 M × 16-bit × 2)
COL
13
12
— — — AP
*
—
10 9 8 7 6 5 4 3 2
256 M bits × 2
0011
13 × 9
ROW
13
12
— 11 25 24 23 22 21 20 19 18 17 16 15 14
(16 M × 16-bit × 2)
COL
13
12
— — — AP
*
—
10 9 8 7 6 5 4 3 2
512 M bits × 2
0100
13 × 10
ROW
13
12
— 26 25 24 23 22 21 20 19 18 17 16 15 14
(32 M × 16-bit × 2)
COL
13
12
— — — AP
*
11
10 9 8 7 6 5 4 3 2
1 G bits × 2
0110
14 × 10
ROW
13
12
27 26 25 24 23 22 21 20 19 18 17 16 15 14
(64 M × 16-bit × 2)
COL
13
12
— — — AP
*
11
10 9 8 7 6 5 4 3 2
Note:
*
Auto-precharge
12.5.13 DDR-SDRAM Access Arbitration
(1) Priority Order of Access Arbitration
The DDRIF has the access arbitration function that arbitrates accesses to the DDR-SDRAM
between the CPU and the LCDC. The priority order of the arbitration is divided in the following
two levels.
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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Page 2026: ...SH7763 Hardware Manual ...