mpc8313e Freescale Semiconductor, Inc, mpc8313e Datasheet - Page 18

• Manufacturer Part Number: mpc8313e
• Description: Mpc8313e Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

DDR and DDR2 SDRAM
6.2
This section provides the AC electrical characteristics for the DDR SDRAM interface.
6.2.1
Table 16
Table 17
Table 18
18
At recommended operating conditions with GV
At recommended operating conditions with GV
At recommended operating conditions. with GV
AC input low voltage
AC input high voltage
AC input low voltage
AC input high voltage
Controller Skew for
MDQS—MDQ//MDM
333 MHz
266 MHz
200 MHz
Note:
1. t
2. The amount of skew that can be tolerated from MDQS to a corresponding MDQ signal is called t
corresponding bit that will be captured with MDQS[n]. This should be subtracted from the total timing budget.
can be determined by the following equation: t
and abs(t
provides the input AC timing specifications for the DDR2 SDRAM when
provides the input AC timing specifications for the DDR SDRAM when GV
provides the input AC timing specifications for the DDR2 SDRAM interface.
CISKEW
DDR and DDR2 SDRAM AC Electrical Characteristics
DDR and DDR2 SDRAM Input AC Timing Specifications
Parameter
Parameter
Parameter
represents the total amount of skew consumed by the controller between MDQS[n] and any
Table 16. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface
CISKEW
Table 17. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface
MPC8313E PowerQUICC
Table 18. DDR and DDR2 SDRAM Input AC Timing Specifications
) is the absolute value of t
Symbol
t
CISKEW
DD
DD
DD
of 1.8 ±5%
of 2.5 ±5%.
of 2.5 ±5%
Symbol
Symbol
V
V
V
V
™
IH
IH
IL
IL
II Pro Processor Hardware Specifications, Rev. 0
CISKEW
DISKEW
–1250
–750
–750
Min
.
MV
MV
REF
REF
= +/–(T/4 – abs(t
Min
Min
—
—
+ 0.25
+ 0.31
CISKEW
1250
Max
750
750
MV
MV
REF
REF
Max
Max
)) where T is the clock period
—
—
– 0.25
– 0.31
Unit
GV
ps
Freescale Semiconductor
DD
Unit
Unit
DD
V
V
V
V
DISKEW
(typ)=2.5 V.
(typ)=
Notes
1, 2
.
1.8 V.
Notes
Notes
This