Section 12 DDR-SDRAM Interface (DDRIF)
Rev. 1.00 Oct. 01, 2007 Page 419 of 1956
REJ09B0256-0100
Bit Bit
Name
Initial
Value R/W
Description
28 to 16 DRI
H'0C34
R/W
DRAM Refresh Interval
When refreshing is valid (the DRE bit in MIM is set to
1), these bits specify the maximum refresh interval
(auto refresh). One count is the same as the cycle of
the memory clock. At 133-MHz operation, one count
corresponds to 7.5 ns. The minimum settable value is
H'020. When a value less than H'020 is set, H'020 is
added to the count value.
The DDRIF has a 13-bit internal counter. When the
DCE or DRE bit is cleared to 0, or the RMODE bit is
set to 1, this counter is cleared to 0. Otherwise, this
counter will increment by the external memory clock.
This counter is compared with the DRI bit. If a match
occurs, an auto-refresh request is generated in the
controller and auto-refreshing is performed. Note that
the counter is cleared to 0 at the match and then
begins incrementing again. The single auto-refresh
request that has been generated is recorded (max.).
When the DCE and DRE bits are set to 1 and the
RMODE bit is cleared to 0, an auto-refresh request is
not cleared until auto refreshing is performed. To set
this bit, the DRE bit should be cleared to 0 and should
be written to, and then 1 should be written to the DRE
bit. In this case, the previous written value should be
set to the DRI bits.
15 to 12 LOCK
Undefined R
DLL Lock Status
These bits indicate the lock status of the DLL for
generating the read timing for the DDR-SDRAM. When
these bits are all set to 1, access to memory is
possible.
11, 10
All
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
9
DRE
0
R/W
DRAM Refresh Enable
Sets whether the refresh mode is valid or invalid.
1: Valid
0: Invalid
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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Страница 2026: ...SH7763 Hardware Manual ...