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Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 371 of 982
REJ09B0023-0400
Power-On Sequence: In order to use synchronous DRAM, mode setting must first be performed
after powering on. To perform synchronous DRAM initialization correctly, the bus state controller
registers must first be set, followed by a write to the synchronous DRAM mode register. In
synchronous DRAM mode register setting, the address signal value at that time is latched by a
combination of the
CSn
,
RASU
,
RASL
,
CASU
,
CASL
, and RD/
WR
signals. If the value to be set
is X, the bus state controller provides for value X to be written to the synchronous DRAM mode
register by performing a write to address H'A4 X for area 2 synchronous DRAM, and to
address H'A4 X for area 3 synchronous DRAM. In this operation the data is ignored, but
the mode write is performed as a byte-size access. To set burst read/single write, CAS latency 2 to
3, wrap type = sequential, and burst length 1 supported by the LSI, arbitrary data is written in a
byte-size access to the addresses shown in table 12.15. In this time 0 is output at the external
address pins of A12 or later.
Table 12.15 Access Address in SDRAM Mode Register Write
•
Setting for Area 2
Burst read/single write (burst length 1):
Data Bus Width
CAS Latency
Access Address
External Address Pin
16 bits
2
H'A4FD4440
H'0000440
3
H'A4FD4460
H'0000460
32 bits
2
H'A4FD4880
H'0000880
3
H'A4FD48C0
H'00008C0
Burst read/burst write (burst length 1):
Data Bus Width
CAS Latency
Access Address
External Address Pin
16 bits
2
H'A4FD4040
H'0000040
3
H'A4FD4060
H'0000060
32 bits
2
H'A4FD4080
H'0000080
3
H'A4FD40C0
H'00000C0
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Страница 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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