mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 16

• Manufacturer Part Number: mpc8309
• Description: Powerquicc Ii Pro Integrated Communications Processor Family Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

DDR2 SDRAM
6.2
This section provides the AC electrical characteristics for the DDR2 SDRAM interface.
6.2.1
Table 14
Table 15
16
At recommended operating conditions with GV
At recommended operating conditions with GV
Input/output capacitance: DQ, DQS
Delta input/output capacitance: DQ, DQS
Note:
1. This parameter is sampled. GV
AC input low voltage
AC input high voltage
Controller skew for MDQS—MDQ/MDM
Notes:
1. t
2. The amount of skew that can be tolerated from MDQS to a corresponding MDQ signal is called t
V
is captured with MDQS[n]. This should be subtracted from the total timing budget.
determined by the equation: t
value of t
CISKEW
OUT
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
(peak-to-peak) = 0.2 V.
provides the input AC timing specifications for the DDR2 SDRAM (GV
provides the input AC timing specifications for the DDR2 SDRAM interface.
represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that
DDR2 SDRAM AC Electrical Characteristics
CISKEW
DDR2 SDRAM Input AC Timing Specifications
Parameter
Parameter/Condition
.
Table 14. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface
Parameter
Table 13. DDR2 SDRAM Capacitance for GV
Table 15. DDR2 SDRAM Input AC Timing Specifications
DISKEW
DD
= 1.8 V ± 0.100 V, f = 1 MHz, T
=
266 MHz
DD
DD
±
(T/4 – abs(t
of 1.8 V± 100mV.
of 1.8V ± 100mV.
Symbol
V
V
IH
IL
CISKEW
Symbol
t
CISKEW
Symbol
)) where T is the clock period and abs(t
MVREF + 0.25
C
C
DIO
IO
Min
A
—
= 25 °C, V
–750
Min
Min
—
6
DD
OUT
(typ) = 1.8 V
= GV
MVREF – 0.25
DD
Max
—
 2,
Max
750
Max
0.5
8
DD
DISKEW
CISKEW
Freescale Semiconductor
(typ) = 1.8 V).
. This can be
Unit
Unit
Unit
) is the absolute
pF
pF
ps
V
V
Notes
Notes
Notes
1, 2
—
—
1
1