mpc8308 Freescale Semiconductor, Inc, mpc8308 Datasheet - Page 11

• Manufacturer Part Number: mpc8308
• Description: Mpc8308 Powerquicc Ii Pro Processor Hardware Specification
• Manufacturer: Freescale Semiconductor, Inc

Table 15
6.2
This section provides the AC electrical characteristics for the DDR2 SDRAM interface.
6.2.1
Table 16
Table 17
Freescale Semiconductor
At recommended operating conditions with GV
At recommended operating conditions. with GV
Controller skew for MDQS—MDQ/MECC @266 MHz
Notes:
1. t
2. The amount of skew that can be tolerated from MDQS to a corresponding MDQ or MECC signal is called t
3. Memory controller ODT value of 150 Ω is recommended
is captured with MDQS[n]. This should be subtracted from the total timing budget.
be determined by the following equation: t
the absolute value of t
CISKEW
AC input low voltage
AC input high voltage
provides the current draw characteristics for MV
provides the input AC timing specifications for the DDR2 SDRAM when
provides the input AC timing specifications for the DDR2 SDRAM interface.
Current draw for MV
Note:
1. The voltage regulator for MV
represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that
DDR2 SDRAM AC Electrical Characteristics
DDR2 SDRAM Input AC Timing Specifications
Parameter
Parameter/Condition
Table 16. DDR2 SDRAM Input AC Timing Specifications for 1.8 V Interface
Parameter
CISKEW
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1
Table 17. DDR2 SDRAM Input AC Timing Specifications
REF
.
Table 15. Current Draw Characteristics for MV
DD
DD
REF
of 1.8 ± 100 mV
DISKEW
of 1.8± 100 mV
Symbol
must be able to supply up to 500 μA current.
V
V
IH
IL
= +/–(T/4 – abs(t
Symbol
I
MVREF
Symbol
t
CISKEW
MV
REF
Min
—
+ 0.45
Min
CISKEW
REF
—
.
–875
Min
)) where T is the clock period and abs(t
MV
Max
500
REF
Max
—
REF
– 0.45
Max
875
Unit
μA
GV
Unit
DD
Unit
V
V
ps
(typ) =
Note
DISKEW
1
DDR2 SDRAM
Notes
1.8V.
CISKEW
—
—
.
Notes
This can
1, 2,3
) is
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