12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 491 of 1658
REJ09B0261-0100
Bit Bit
Name
Initial
Value R/W
Description
2 to 0
TRCD2 to
TRCD0
001
R/W
tRCD (ACT-READ/WRITE period) Setting Bits
These bits set the ACT-READ/WRITE minimum period.
These bits should be set according to the DDR2-
SDRAM specifications. The number of cycles is the
number of DDR clock cycles.
000: Setting prohibit (If specified, correct operation
cannot be guaranteed.)
001: 2 cycles
010: 3 cycles
011: 4 cycles
100: 5 cycles
101: Setting prohibit (If specified, correct operation
cannot be guaranteed.)
:
111: Setting prohibit (If specified, correct operation
cannot be guaranteed.)
Notes: 1. AL (Additive Latency) supported by the DBSC2 is only 0.
2. Writing to this register should be performed only when the following conditions are met.
•
When SDRAM access is disabled (when the ACEN bit in the DBEN register is 0.).
•
When automatic issue of auto-refresh is disabled (when the ARFEN bit in the
DBRFCNT0 register is cleared to 0.).
Summary of Contents for SH7781
Page 4: ...Rev 1 00 Jan 10 2008 Page iv of xxx REJ09B0261 0100 ...
Page 74: ...2 Programming Model Rev 1 00 Jan 10 2008 Page 44 of 1658 REJ09B0261 0100 ...
Page 272: ...8 Caches Rev 1 00 Jan 10 2008 Page 242 of 1658 REJ09B0261 0100 ...
Page 376: ...10 Interrupt Controller INTC Rev 1 00 Jan 10 2008 Page 346 of 1658 REJ09B0261 0100 ...
Page 694: ...13 PCI Controller PCIC Rev 1 00 Jan 10 2008 Page 664 of 1658 REJ09B0261 0100 ...
Page 762: ...14 Direct Memory Access Controller DMAC Rev 1 00 Jan 10 2008 Page 732 of 1658 REJ09B0261 0100 ...
Page 788: ...15 Clock Pulse Generator CPG Rev 1 00 Jan 10 2008 Page 758 of 1658 REJ09B0261 0100 ...
Page 828: ...17 Power Down Mode Rev 1 00 Jan 10 2008 Page 798 of 1658 REJ09B0261 0100 ...
Page 846: ...18 Timer Unit TMU Rev 1 00 Jan 10 2008 Page 816 of 1658 REJ09B0261 0100 ...
Page 1292: ...24 Multimedia Card Interface MMCIF Rev 1 00 Jan 10 2008 Page 1262 of 1658 REJ09B0261 0100 ...
Page 1326: ...25 Audio Codec Interface HAC Rev 1 00 Jan 10 2008 Page 1296 of 1658 REJ09B0261 0100 ...
Page 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Page 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
Page 1688: ...Appendix Rev 1 00 Jan 10 2008 Page 1658 of 1658 REJ09B0261 0100 ...
Page 1691: ......
Page 1692: ...SH7785 Hardware Manual ...