
Electrical Specifications
215
December 2003 Revised March 2005
SPRS231D
5.8
EMIFF/SDR SDRAM Interface Timing
Table 513 and Table 514 assume testing over recommended operating conditions
(see Figure 525
through Figure 530).
Table 513. EMIFF/SDR SDRAM Interface Timing Requirements
NO
DV
DD4
= 1.8 V
NOMINAL
DV
DD4
= 2.75 V/3.3 V
NOMINAL
UNIT
MIN
MAX
MIN
MAX
SD7
t
su(DV–CLKH)
t
h(CLKH–DV)
Setup time, read data valid before SDRAM.CLK high
1
1
ns
SD8
Hold time, read data valid after SDRAM.CLK high
1.5
1.5
ns
Table 514. EMIFF/SDR SDRAM Interface Switching Characteristics
NO
PARAMETER
DV
DD4
= 1.8 V
NOMINAL
DV
DD4
= 2.75 V/3.3 V
NOMINAL
UNIT
MIN
MAX
MIN
MAX
SD1
t
c(CLK)
t
w(CLK)
Cycle time, SDRAM.CLK
P
P
ns
SD2
Pulse duration, SDRAM.CLK high or low
0.45P
0.55P
0.45P
0.55P
ns
SD3
t
d(CLKH–DQMV)
Delay time, SDRAM.CLK high to SDRAM.DQMx
valid
1.20 + D
§
1.22 + D
§
ns
SD4
t
d(CLKH–DQMIV)
Delay time, SDRAM.CLK high to SDRAM.DQMx
invalid
0 + D
§
0 + D
§
ns
SD5
t
d(CLKH–AV)
Delay time, SDRAM.CLK high to
SDRAM.A[13:0] address valid
0.5P + 1.49
0.5P + 1.63
ns
SD6
t
d(CLKH–AIV)
Delay time, SDRAM.CLK high to
SDRAM.A[13:0] address invalid
0.5P
0.5P
ns
SD9
t
d(CLKH–SDCASL)
Delay time, SDRAM.CLK high to SDRAM.CAS
low
0.5P
0.5P + 1.18
0.5P
0.5P + 1.40
ns
SD10
t
d(CLKH–SDCASH)
Delay time, SDRAM.CLK high to SDRAM.CAS
high
0.5P
0.5P + 1.18
0.5P
0.5P + 1.40
ns
SD11
t
d(CLKH–DV)
Delay time, SDRAM.CLK high to
SDRAM.D[15:0] data valid
0.5P + 0.60
0.5P + 0.75
ns
SD12
t
d(CLKH–DIV)
Delay time, SDRAM.CLK high to
SDRAM.D[15:0] data invalid
0.5P
0.5P
ns
SD13
t
d(CLKH–SDWEL)
Delay time, SDRAM.CLK high to SDRAM.WE
low
0.5P
0.5P + 1.26
0.5P
0.5P + 1.44
ns
SD14
t
d(CLKH–SDWEH)
Delay time, SDRAM.CLK high to SDRAM.WE
high
0.5P
0.5P + 1.26
0.5P
0.5P + 1.44
ns
SD15
t
d(CLKH–BAV)
Delay time, SDRAM.CLK high to
SDRAM.BA[1:0] valid
0.5P + 1.44
0.5P + 1.55
ns
SD16
t
d(CLKH–BAIV)
Delay time, SDRAM.CLK high to
SDRAM.BA[1:0] invalid
0.5P
0.5P
ns
SD17
t
d(CLKH–RASL)
Delay time, SDRAM.CLK high to SDRAM.RAS
low
0.5P
0.5P + 1.50
0.5P
0.5P + 1.78
ns
SD18
t
d(CLKH–RASH)
Delay time, SDRAM.CLK high to SDRAM.RAS
high
0.5P
0.5P + 1.50
0.5P
0.5P + 1.78
ns
The maximum EMIFF/SDRAM clock rate is limited to the maximum traffic controller clock rate for the OMAP5912.
P = SDRAM.CLK period in nanoseconds.
§
D is an external delay element of between 2 ns to 5 ns that must be added to the OMAP5912 DQM signal for proper operation with SDRAMs.