Datasheet

Table Of Contents
Rev. 0 | Page 68 of 112 | June 2013
ADSP-BF606/ADSP-BF607/ADSP-BF608/ADSP-BF609
DDR2 SDRAM Read Cycle Timing
Table 37. DDR2 SDRAM Read Cycle Timing, V
DD_DMC
Nominal 1.8 V
250 MHz
1
1
In order to ensure proper operation of the DDR2, all the DDR2 guidelines have to be strictly followed.
Parameter Min Max Unit
Timing Requirements
t
DV
Data Valid Window 1 ns
t
DQSQ
DMC0_DQS-DMC0_DQ Skew for DMC0_DQS and Associated DMC0_
DQ Signals
0.35 ns
t
QH
DMC0_DQ, DMC0_DQS Output Hold Time From DMC0_DQS 1.6 ns
t
RPRE
Read Preamble 0.9 t
CK
t
RPST
Read Postamble 0.4 t
CK
Figure 20. DDR2 SDRAM Controller Input AC Timing
DDR2_CLKx
DDR2_DQSn
t
AC
t
RPRE
t
DQSQ
t
DQSQ
t
QH
t
RPST
DDR2_DATA
DDR2_CLKx
DDR2_DQSn
t
DQSCK
t
CK
t
CH
t
CL
t
AS
t
AH
DDR2_ADDR
DDR2_CTL
t
QH