DDR2 and DDR3 SDRAM Controller
6 DDR2 and DDR3 SDRAM Controller
This section describes the DC and AC electrical specifications for the DDR2 and DDR3 SDRAM
controller interface of the MPC8572E. Note that the required GV (typ) voltage is 1.8Vor 1.5V when
DD
interfacing to DDR2 or DDR3 SDRAM respectively.
6.1
DDR2 and DDR3 SDRAM Interface DC Electrical Characteristics
Table 10 provides the recommended operating conditions for the DDR SDRAM Controller of the
MPC8572E when interfacing to DDR2 SDRAM.
Table 10. DDR2 SDRAM Interface DC Electrical Characteristics for GV (typ) = 1.8 V
DD
Parameter/Condition
I/O supply voltage
Symbol
GV
Min
Max
Unit
Notes
1.71
1.89
V
V
1
2
DD
I/O reference voltage
I/O termination voltage
Input high voltage
MV
n
0.49 × GV
0.51 × GV
DD
REF
DD
V
MV
n – 0.04
MV n + 0.04
REF
V
3
TT
REF
V
MV
n + 0.125
GV + 0.3
V
—
—
4
IH
REF
DD
Input low voltage
V
–0.3
–50
MV
n – 0.125
REF
V
IL
Output leakage current
I
50
—
—
μA
mA
mA
OZ
OH
Output high current (V
= 1.420 V)
I
–13.4
13.4
—
—
OUT
Output low current (V
= 0.280 V)
I
OL
OUT
Notes:
1. GV is expected to be within 50 mV of the DRAM GV at all times.
DD
DD
2. MV
n is expected to be equal to 0.5 × GV , and to track GV DC variations as measured at the receiver.
REF
DD DD
n may not exceed ±2% of the DC value.
Peak-to-peak noise on MV
REF
3. V is not applied directly to the device. It is the supply to that far end signal termination is made and is expected to be
TT
equal to MV
n. This rail should track variations in the DC level of MV
n.
REF
REF
4. Output leakage is measured with all outputs disabled, 0 V ≤ VOUT ≤ GV
.
DD
Table 11 provides the recommended operating conditions for the DDR SDRAM Controller of the
MPC8572E when interfacing to DDR3 SDRAM.
Table 11. DDR3 SDRAM Interface DC Electrical Characteristics for GV (typ) = 1.5 V
DD
Parameter/Condition
I/O supply voltage
Symbol
GV
Min
Typical
Max
Unit
1.425
1.575
V
V
V
V
1
2
DD
I/O reference voltage
Input high voltage
Input low voltage
MV
n
0.49 × GV
0.51 × GV
DD
REF
DD
V
MV
n + 0.100
GV
DD
—
—
IH
REF
V
GND
MV
n – 0.100
REF
IL
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
19
FREESCALE [ Freescale ]
