
Electrical Specifications
219
December 2003 Revised March 2005
SPRS231D
5.9
EMIFF/Mobile DDR SDRAM Timing
Table 515 and Table 516 assume testing over recommended operating conditions
(see Figure 531
through Figure 533).
Table 515. EMIFF/Mobile DDR SDRAM Timing Requirements
NO
DV
DD4
= 1.8 V
NOMINAL
UNIT
MIN
MAX
DD17
t
su(DV-DQSL/H)
Setup time, SDRAM.D[15:0] input data valid to
SDRAM.DQSL/H input high or low
DLL phase
= 72
°
0.76 0.2P
ns
DD18
t
h(DQSL/H-DV)
Hold time, SDRAM.DQSL/H input high or low to
SDRAM.D[15:0] input data valid before
SDRAM.D[15:0] expires
DLL phase
= 72
°
0.2P + 0.8
ns
P = SDRAM.CLK period in nanoseconds.
DLL phase value is defined in the EMIFF DLL read control register (DLL_PHASE bit). The delay time assume that WRITE_OFFSET bits value = 0
(in DLL_URD_CONTROL and DLL_LRD_CONTROL registers).
Table 516. EMIFF/Mobile DDR SDRAM Switching Characteristics
NO
PARAMETER
DV
DD4
= 1.8 V
NOMINAL
UNIT
MIN
P
MAX
DD1
t
c(CLK)
t
w(CLK)
t
osu(CLKH-CSL)
t
oh(CLKH-CSH)
Cycle time, SDRAM.CLK/SDRAM.DDR-CLK
ns
DD2
Pulse duration, SDRAM.CLK/SDRAM.DDR-CLK
0.45P
0.55P
ns
DD3
Output setup time, SDRAM.CLK high to SDRAM.CS low
0.5P 3.21
ns
DD4
Output hold time, SDRAM.CLK high to SDRAM.CS high
0.5P 3.21
ns
DD5
t
osu(CLKH-RASL)
t
osu(CLKH-CASL)
t
oh(CLKH-RASH)
t
oh(CLKH-CASH)
Output setup time, SDRAM.CLK high to SDRAM.RAS low
0.5P 3.21
ns
DD5A
Output setup time, SDRAM.CLK high to SDRAM.CAS low
0.5P 3.21
ns
DD6
Output hold time, SDRAM.CLK high to SDRAM.RAS high
0.5P 3.21
ns
DD6A
Output hold time, SDRAM.CLK high to SDRAM.CAS high
0.5P 3.21
ns
DD7
t
osu(CLKH-BAV)
Output setup time, SDRAM.CLK high to SDRAM.BA[1:0] bank
select valid
0.5P 3.21
ns
DD8
t
oh(CLKH-BAIV)
Output hold time, SDRAM.CLK high to SDRAM.BA[1:0] bank
select invalid
0.5P 3.21
ns
DD9
t
osu(CLKH-AV)
Output setup time, SDRAM.CLK high to SDRAM.A[13:0] address
valid
0.5P 3.71
ns
DD10
t
oh(CLKH-AIV)
Output hold time, SDRAM.CLK high to SDRAM.A[13:0] address
invalid
0.5P 3.71
ns
DD11
t
osu(CLKH-WEL)
t
oh(CLKH-WEH)
Output setup time, SDRAM.CLK high to SDRAM.WE low
0.5P 3.21
ns
DD12
Output hold time, SDRAM.CLK high to SDRAM.WE high
0.5P 3.21
ns
DD13
t
osu(DV-DQSL/H)
Output setup time, SDRAM.DQSL/H
(DQML/U) high/low to SDRAM.D[15:0] valid
DLL phase = 72
°
0.3P 2.12
ns
DD14
t
oh(DQSL/H-DV)
Output hold time, SDRAM.DQSL/H high or
low (DQML/U) to SDRAM.D[15:0]
DLL phase = 72
°
0.7P 6.28
ns
P = SDRAM.CLK period in nanoseconds
The maximum EMIFF/SDRAM clock rate is limited to the maximum traffic controller clock rate for the OMAP5912.