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ADSP-21367/ADSP-21368/ADSP-21369
Rev. D
|
Page 27 of 56
|
November 2008
SDRAM Interface Enable/Disable Timing (166 MHz SDCLK)
Table 24. SDRAM Interface Enable/Disable Timing
1
1
For f
CCLK
= 400 MHz (SDCLK ratio = 1:2.5).
Parameter
Min
Max
Unit
Switching Characteristics
t
DSDC
Command Disable After CLKIN Rise
2 × t
PCLK
+ 3
ns
t
ENSDC
Command Enable After CLKIN Rise
4.0
ns
t
DSDCC
SDCLK Disable After CLKIN Rise
8.5
ns
t
ENSDCC
SDCLK Enable After CLKIN Rise
3.8
ns
t
DSDCA
Address Disable After CLKIN Rise
9.2
ns
t
ENSDCA
Address Enable After CLKIN Rise
2 × t
PCLK
– 4
4 × t
PCLK
ns
Figure 17. SDRAM Interface Enable/Disable Timing
CLKIN
COMMAND
S
DCLK
ADDR
t
D
S
DC
t
D
S
DCC
t
D
S
DCA
t
EN
S
DC
t
EN
S
DCA
COMMAND
S
DCLK
ADDR
t
EN
S
DCC