Section 12 DDR-SDRAM Interface (DDRIF)
Rev.1.00 Dec. 13, 2005 Page 419 of 1286
REJ09B0158-0100
Bit Bit
Name
Initial
Value R/W Description
17, 16
RW
00
R/W
Minimum Number of Cycles from Read Command to
Write Command
These bits specify the minimum number of cycles
required by the SRAM from the issuing of a READ
command to the issuing of a subsequent WRITE
command.
00: 3 cycles
01: 4 cycles
10: 5 cycles
11: 6 cycles
15 to 13 SRFC
000
R/W
Number of Cycles within a Single Individual Bank
These bits specify the number of cycles between the
following access operations in a given bank (the
corresponding time is tRFC).
(1) From auto-refresh to issuing the ACT command
(2) From auto refresh to auto refresh
000: 11 cycles
001: 12 cycles
010: 13 cycles
011: 14 cycles
100: 15 cycles
Other than above: Setting prohibited
12
SWR
0
R/W
PRE/PREALL Command Issuing Cycle
Within write cycles, specifies the number of cycles from
the last postamble to the issuing of a PRE/PREALL
command (the corresponding time is tWR).
0: 2 cycles
1: 3 cycles
11
SRRD
0
R/W
Inter-bank Number of Cycles between ACT Commands
Specifies the minimum number of cycles between the
issuing of ACT commands (the corresponding time is
tRRD) for any two banks.
0: 2 cycles
1: 3 cycles
Содержание SH7780 Series
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Страница 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Страница 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Страница 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Страница 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Страница 1004: ...Section 24 Multimedia Card Interface MMCIF Rev 1 00 Dec 13 2005 Page 954 of 1286 REJ09B0158 0100 ...
Страница 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
Страница 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Страница 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Страница 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Страница 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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