Section 12 DDR-SDRAM Interface (DDRIF)
Rev.1.00 Dec. 13, 2005 Page 410 of 1286
REJ09B0158-0100
12.4 Register
Descriptions
Table 12.4 shows the DDRIF register configuration. Table 12.5 shows the register states in each
processing mode.
These registers should only be set while access to the DDR-SDRAM from a module is not in
progress. Furthermore, access to registers other than the memory interface mode register (MIM)
should only proceed when the MIM’s DCE bit (DDR-SDRAM control enable) is cleared to 0 or
the MIM’s SELFS bit (self-refresh status) is set to 1.
Although the registers are 64 bits wide, they should be accessed in longword (32-bit) units. The
value of a longword written to the register will be reflected correctly. A longword read from the
register will contain the value in the corresponding half of the register at the time of reading.
Whether the current endian is big or little, specify the address listed below to access bits 63 to 32.
To access bits 31 to 0, specify the address listed below + 4.
Table 12.4 Register Configuration
Register Name
Abbreviation R/W
P4 Address
Area 7
Address
Access
Size
Memory interface mode register MIM
R/W
H'FE80 0008
H'1E80 0008
32
DDR-SDRAM control register
SCR
R/W
H'FE80 0010
H'1E80 0010
32
DDR-SDRAM timing register
STR
R/W
H'FE80 0018
H'1E80 0018
32
DDR-SDRAM row attribute
register
SDR
R/W
H'FE80 0030
H'1E80 0030
32
DDR-SDRAM mode register
SDMR
W
H'FECx xxxx
*
H'1ECx
xxxx
*
32
DDR-SDRAM back-up register
DBK
R
H'FE80 0400
H'1E80 0400
32
Note:
*
For details, see section 12.4.5, SDRAM Mode Register (SDMR).
Содержание SH7780 Series
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