LM3S1621 Datasheet, PDF (898/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Electrical Characteristics
Figure 21-14. SDRAM Read Timing
CLK
(EPI0S31)
CKE
(EPI0S30)
CSn
(EPI0S29)
WEn
(EPI0S28)
RASn
(EPI0S19)
CASn
(EPI0S18)
DQMH, DQML
(EPI0S [17:16])
AD [15:0]
(EPI0S [15:0])
E4
E5
Row
Activate
NOP
AD [15:0] driven out
E6
E7
E8
NOP
Column
Read
NOP
AD [15:0] driven out
Data 0
Data 1
...
Burst
Term
AD [15:0] driven in
Data n
Figure 21-15. SDRAM Write Timing
CLK
(EPI0S31)
CKE
(EPI0S30)
CSn
(EPI0S29)
WEn
(EPI0S28)
RASn
(EPI0S19)
CASn
(EPI0S18)
DQMH, DQML
(EPI0S [17:16])
AD [15:0]
(EPI0S [15:0])
E4
E5
Row
Activate
NOP
NOP
AD [15:0] driven out
Column-1
Write
Data 0
Data 1
...
AD [15:0] driven out
E6
Data n
Burst
Term
Table 21-23. EPI Host-Bus 8 and Host-Bus 16 Interface Characteristics
Parameter No
E14
E15
E16
E17
E18
E19
E20
E21
E22
Parameter
T_ISU
T_IH
T_DV
T_DI
T_OV
T_OINV
T_STLOW
T_FIFO
T_ALEHIGH
Parameter Name
Read data set up time
Read data hold time
WEn to write data valid
Data hold from WEn invalid
CSn to output valid
CSn to output invalid
WEn / RDn strobe width low
FEMPTY and FFULL setup time to
clock edge
ALE width high
Min Nom Max
10
-
-
0
-
-
-
-
5
2
-
-
-5
-
5
-5
-
5
2
-
-
2
-
-
-
1
-
Unit
ns
ns
ns
EPI Clocks
ns
ns
EPI Clocks
System Clocks
EPI Clocks
898
January 21, 2012
Texas Instruments-Production Data