ml675050 Oki Semiconductor, ml675050 Datasheet - Page 44

• Manufacturer Part Number: ml675050
• Description: Arm7tdmi Based Micro-controller For Ic Card Reader/writer
• Manufacturer: Oki Semiconductor

ELECTRICAL CHARACTERISTICS (AC CHARACTERISTICS)
(14) SDRAM Access Timing (1/5)
OKI Semiconductor
Parameter
SDCS_N delay time
(SDRAM)
SDCKE delay time
(SDRAM)
BS0_N, BS1_N delay
time (SDRAM)
SDRAS_N delay time
(SDRAM)
SDCAS_N delay time
(SDRAM)
SDRAS_N-SDCAS_N
Minimum delay time
(SDRAM)
SDRAS_N active time
(SDRAM)
SDRAS_N precharge
time (SDRAM)
WR_N delay time
(SDRAM)
XD[15:0] input setup time
(SDRAM)
XD[31:0] input hold time
(SDRAM)
XA[23:0] delay time
(SDRAM)
XD[15:0] output delay
time (SDRAM)
XD[15:0] output hold time
(SDRAM)
XD[15:0] output enable
time (SDRAM)
XD[15:0] output disable
time (SDRAM)
Notes:
*1: Because the output delay of SDCLK increases at a rate of 0.3 ns/10 pF, the output setup time increases
*2: The actual value will be a negative value due to external load, but input so as to guarantee minimum
accordingly.
hold time 0.
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
SDCSD
SDCSD
DQMD
SDRASD
SDCASD
SDRCD
SDRAS
SDRP
SDWED
SDXDIS
SDXDIH
SDXAD
SDXDOD
SDXDOH
SDXDOE
SDXDODE
Condition Min.
CL
30 pF
—
CL
30 pF
=
=
0.5t
0.5t
0.5t
0.5t
0.5t
n
n
n
0.5t
8
1
0.5t
0.5t
0.5t
0.5t
0.5t
SD1
SD2
SD3
(*1)
(*2)
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
t
t
t
SDC
SDC
SDC
– 4 —
– 3 —
– 6 —
– 3 —
– 3 —
– 3 —
– 6 —
– 6 —
– 3 —
– 6 —
– 3 —
Typ.
—
—
—
—
—
Max.
0.5t
0.5t
0.5t
0.5t
0.5t
—
—
—
0.5t
—
—
0.5t
0.5t
0.5t
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
SDC
+ 4
+ 3
+ 6
+ 3
+ 3
+ 3
+ 6
+ 6
+ 6
Unit
ns
Remarks
The tRCD, tRAS, tRP and
tDPL when accessing
SDRAM are the parameters
that can be set by the
DRPC register.
See Table below for details.
n
n
n
SD1
SD2
SD3
= tRP
= tRCD
= tRAS
FEDL675050-02
ML675050
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