12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 534 of 1658
REJ09B0261-0100
MCK0,
MCK1
MA[14:11]
MA[9:0]
MBA[2:0]
MCKE
M
CS
M
R
A
S
M
C
A
S
M
W
E
MA[10]
ACT
bank A
bank A
Invalid
Invalid
MDQS[3:0]
MDQ[31:0]
MDM[3:0]
Invalid
Invalid
SDRAM
command
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Example of CL = 3
Valid
Valid
Valid
Valid
Valid
Valid
Write data
bank A
WRITE
WRITE
Valid
Valid
Valid
Hi
g
h level
Figure 12.11 Waveforms for 32-Byte Writing (When the Bus Width Is Set to 32 Bits)
Figure 12.12 shows waveforms during auto-refresh operation resulting from settings of the
SDRAM refresh control registers 0, 1, and 2. The DBSC2 issues a REF command automatically
after the PALL command is issued when at least one DDR2-SDRAM bank is activated before the
REF command. Consequently, there is no need to use software to manage precharging of all the
banks for the auto-refresh operation.
Содержание SH7781
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Страница 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Страница 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
Страница 1688: ...Appendix Rev 1 00 Jan 10 2008 Page 1658 of 1658 REJ09B0261 0100 ...
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