MPC8377ECVRALFA datasheet(16/124 Pages) FREESCALE

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MPC8377E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

DDR1 and DDR2 SDRAM

This section describes the DC and AC electrical specifications for the DDR SDRAM interface of the

MPC8377E. Note that DDR1 SDRAM is GVDD(typ) = 2.5 V and DDR2 SDRAM is GVDD(typ) = 1.8 V.

6.1

DDR1 and DDR2 SDRAM DC Electrical Characteristics

Table 12 provides the recommended operating conditions for the DDR2 SDRAM component(s) of the

device when GVDD(typ) = 1.8 V.

Table 13 provides the DDR2 capacitance when GVDD(typ) = 1.8 V.

Table 12. DDR2 SDRAM DC Electrical Characteristics for GVDD(typ) = 1.8 V

Parameter

Symbol

Min

Max

Unit

Notes

I/O supply voltage

GVDD

1.71

1.89

I/O reference voltage

MVREF

0.49

× GVDD

0.51

× GVDD

V2, 5

I/O termination voltage

VTT

MVREF –0.04

MVREF +0.04

Input high voltage

VIH

MVREF + 0.140

GVDD +0.3

—

Input low voltage

VIL

–0.3

MVREF – 0.140

—

Output leakage current

IOZ

–40

μA4

Output high current (VOUT =1.40V)

IOH

–13.4

—

Output low current (VOUT =0.3 V)

IOL

13.4

—

Note:

1 GV

DD is expected to be within 50 mV of the DRAM GVDD at all times.

2 MV

REF is expected to be equal to 0.5 × GVDD, and to track GVDD DC variations as measured at the receiver. Peak-to-peak

noise on MVREF may not exceed ±2% of the DC value.

3 V

TT is not applied directly to the device. It is the supply to which far end signal termination is made and is expected to be

equal to MVREF. This rail should track variations in the DC level of MVREF.

4 Output leakage is measured with all outputs disabled, 0 V

≤ V

OUT ≤ GVDD.

5 See AN3665, MPC837xE Design Checklist, for proper DDR termination.

Table 13. DDR2 SDRAM Capacitance for GVDD(typ) = 1.8 V

Parameter

Symbol

Min

Max

Unit

Notes

Input/output capacitance: DQ, DQS, DQS

CIO

Delta input/output capacitance: DQ, DQS, DQS

CDIO

—0.5

Note:

1 This parameter is sampled. GV

DD = 1.8 V ± 0.090 V, f = 1 MHz, TA =25°C, VOUT = GVDD/2, VOUT (peak-to-peak) = 0.2 V.

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