
Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 335 of 982
REJ09B0023-0400
12.5.6 SDRAM
Interface
SDRAM Direct Connection: The SDRAM that can be connected to this LSI is a product that has
11/12/13 bits of row address, 8/9/10 bits of column address, 4 or less banks, and uses the A10 pin
for setting precharge mode in read and write command cycles. The control signals for direct
connection of SDRAM are
RASU
,
RASL
,
CASU
,
CASL
, RD/
WR
, DQMUU, DQMUL, DQMLU,
DQMLL, CKE,
CS2
, and
CS3
. All the signals other than
CS2
and
CS3
are common to all areas,
and signals other than CKE are valid when
CS2
or
CS3
is asserted. SDRAM can be connected to
up to 2 spaces. The data bus width of the area that is connected to SDRAM can be set to 32 or 16
bits.
Burst read/single write (burst length 1) and burst read/burst write (burst length 1) are supported as
the SDRAM operating mode.
Commands for SDRAM can be specified by
RASU
,
RASL
,
CASU
,
CASL
, RD/
WR
, and specific
address signals. These commands supports:
•
NOP
•
Auto-refresh (REF)
•
Self-refresh (SELF)
•
All banks pre-charge (PALL)
•
Specified bank pre-charge (PRE)
•
Bank active (ACTV)
•
Read (READ)
•
Read with pre-charge (READA)
•
Write (WRIT)
•
Write with pre-charge (WRITA)
•
Write mode register (MRS)
•
EMRS
The byte to be accessed is specified by DQMUU, DQMUL, DQMLU, and DQMLL. Reading or
writing is performed for a byte whose corresponding DQMxx is low. For details on the
relationship between DQMxx and the byte to be accessed, refer to section 12.5.1, Endian/Access
Size and Data Alignment.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
Page 1035: ......
Page 1036: ...SH7641 Hardware Manual...