AM3359 datasheet(170/236 Pages) TI

170 / 236 page

DDR_CK

DDR_CKn

AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

SPRS717F – OCTOBER 2011 – REVISED APRIL 2013

www.ti.com

5.6.2.3

DDR3 and DDR3L Routing Guidelines

NOTE

All references to DDR3 in this section apply to DDR3 and DDR3L devices, unless otherwise

noted.

5.6.2.3.1 Board Designs

TI only supports board designs utilizing DDR3 memory that follow the guidelines in this document. The

switching characteristics and timing diagram for the DDR3 memory interface are shown in Table 5-56 and

Figure 5-46.

Table 5-56. Switching Characteristics for DDR3 Memory Interface

NO.

PARAMETER

MIN

MAX

UNIT

tc(DDR_CK)

Cycle time, DDR_CK and DDR_CKn

2.5

3.3(1)

tc(DDR_CKn)

(1) The JEDEC JESD79-3F Standard defines the maximum clock period of 3.3 ns for all standard-speed bin DDR3 and DDR3L memory

devices. Therefore, all standard-speed bin DDR3 and DDR3L memory devices are required to operate at 303 MHz.

Figure 5-46. DDR3 Memory Interface Clock Timing

5.6.2.3.1.1 DDR3 versus DDR2

This specification only covers AM335x PCB designs that utilize DDR3 memory. Designs using DDR2

memory should use the DDR2 routing guidleines described in Section 5.6.2.2. While similar, the two

memory systems have different requirements. It is currently not possible to design one PCB that meets

the requirements of both DDR2 and DDR3.

5.6.2.3.2 DDR3 Device Combinations

Since there are several possible combinations of device counts and single-side or dual-side mounting,

Table 5-57 summarizes the supported device configurations.

Table 5-57. Supported DDR3 Device Combinations

NUMBER OF DDR3 DEVICES

DDR3 DEVICE WIDTH (BITS)

MIRRORED?

DDR3 EMIF WIDTH (BITS)

Y(1)

(1)

Two DDR3 devices are mirrored when one device is placed on the top of the board and the second device is placed on the bottom of

the board.

170

Peripheral Information and Timings

Submit Documentation Feedback

Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352

AM3359 Datasheet(PDF) 170 Page - Texas Instruments

AM3359 Datasheet(HTML) 170 Page - Texas Instruments

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 95 96 97 98 99 100 ...More

Datasheet Download

Link URL