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AM3874 Datasheet(PDF) 293 Page - Texas Instruments |
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AM3874 Datasheet(HTML) 293 Page - Texas Instruments |
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293 / 361 page  AM3874, AM3871 www.ti.com SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013 8.13.4.2.4.1 Compatible JEDEC DDR3 Devices Table 8-66 shows the parameters of the JEDEC DDR3 devices that are compatible with this interface. Generally, the DDR3 interface is compatible with DDR3-1600 devices in the x8 or x16 widths. Table 8-66. Compatible JEDEC DDR3 Devices (Per Interface) NO. PARAMETER MIN MAX UNIT 1 JEDEC DDR3 device speed grade(1) DDR3-800 DDR3- 1600(2) 2 JEDEC DDR3 device bit width x8 x16 Bits 3 JEDEC DDR3 device count(3) 2 8 Devices (1) DDR3 speed grade depends on desired clock rate. Data rate is 2x the clock rate. For DDR3-800, the clock rate is 400 MHz. (2) DDR3 devices with speed grades up to DDR3-1600 are supported; however, max clock rate will still be limited to 533 MHz as stated in Switching Characteristics Over Recommended Operating Conditions for DDR3 Memory Controller. (3) For valid DDR3 device configurations and device counts, see Section 8.13.4.2.4, Figure 8-54, and Figure 8-55. 8.13.4.2.4.2 PCB Stackup The minimum stackup for routing the DDR3 interface is a four-layer stack up as shown in Table 8-67. Additional layers may be added to the PCB stackup to accommodate other circuitry, enhance SI/EMI performance, or to reduce the size of the PCB footprint. A six-layer stackup is shown in Table 8-68. Complete stackup specifications are provided in Table 8-69. Table 8-67. Minimum PCB Stackup LAYER TYPE DESCRIPTION 1 Signal Top routing mostly vertical 2 Plane Split power plane 3 Plane Full ground plane 4 Signal Bottom routing mostly horizontal Table 8-68. Six-Layer PCB Stackup Suggestion LAYER TYPE DESCRIPTION 1 Signal Top routing mostly vertical 2 Plane Ground 3 Plane Split power plane 4 Plane Split power plane or Internal routing 5 Plane Ground 6 Signal Bottom routing mostly horizontal Copyright © 2011–2013, Texas Instruments Incorporated Peripheral Information and Timings 293 Submit Documentation Feedback Product Folder Links: AM3874 AM3871 |
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