MPC5125 datasheet(54/94 Pages) FREESCALE

54 / 94 page

MPC5125 Microcontroller Data Sheet, Rev. 4

Electrical and Thermal Characteristics

Freescale Semiconductor

4.3.5.4

SDR SDRAM AC Timing Specifications

NOTE

To achieve better timing, balance the loading of DQS as MCK although DQS is not used in

SDR mode.

Figure 9 shows the DDR SDRAM write timing.

Figure 9. DDR Write Timing

NOTES:

1 Measured with clock pin loaded with differential 100

 termination resistor.

2 Measured with all outputs except the clock loaded with 50

 termination resistor to V

DD_IO_MEM/2.

3 All transitions measured at mid-supply (V

DD_IO_MEM/2).

4 In this window, the first rising edge of DQS should occur. From the start of the window to DQS rising edge, DQS should be low.

5 The window position is given for t

DQSEN = 2.5 tCK (RDLY = 2, HALF DQS DLY = 1, QUART DQS DLY = 0) with CL = 3 DDR2

SDRAM device. For other values of tDQSEN, the window position is shifted accordingly.

Table 24. SDR SDRAM Timing Specifications

At recommended operating conditions with VDD_IO_MEM of 5%

Parameter

Symbol

Min

Max

Unit Notes SpecID

Clock cycle time, CL = x

tCK

7500

—

A5.1

CK HIGH pulse width

tCH

0.43

0.57

tCK

1,3

NOTES:

1 Measured with clock pin loaded with 50

 termination resistor to mid-supply.

A5.3

CK LOW pulse width

tCL

0.43

0.57

tCK

1,3

A5.4

Address, control, and data output setup time relative

to MCK rising edge

tOS(base)

tCK/2 – 1000

—

2,3

2 Measured with all outputs except the clock loaded with 50

 termination resistor to V

DD_IO_MEM/2.

3 All transitions measured at mid-supply (V

DD_IO_MEM/2).

A5.6

Address, control, and data output hold time relative to

MCK rising edge

tOH(base)

tCK/2 – 1000

—

2,3

A5.7

Input data set-up time, relative to MCK

tIS

1000

—

A5.15

Input data hold time, relative to MCK

tIH

1000

—

A5.16

MCK

tCH

tCL

DQS

tDQSS

DQ, DM(out)

tDS

tDH

tCK

MPC5125 Datasheet(PDF) 54 Page - Freescale Semiconductor, Inc

MPC5125 Datasheet(HTML) 54 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

Datasheet Download

Link URL