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AM3874 Datasheet(PDF) 334 Page - Texas Instruments |
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AM3874 Datasheet(HTML) 334 Page - Texas Instruments |
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334 / 361 page  AM3874, AM3871 SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013 www.ti.com 8.18.2.2 Compatible SATA Components and Modes Table 8-100 shows the compatible SATA components and supported modes. Note that the only supported configuration is an internal cable from the processor host to the SATA device. Table 8-100. SATA Supported Modes PARAMETER MIN MAX UNIT SUPPORTED Transfer Rates 1.5 3.0 Gbps xSATA - - - No Backplane - - - No Internal Cable (iSATA) - - - Yes 8.18.2.3 PCB Stackup Specifications Table 8-101 shows the PCB stackup and feature sizes required for SATA. Table 8-101. SATA PCB Stackup Specifications PARAMETER MIN TYP MAX UNIT PCB routing/plane layers 4 6 - Layers Signal routing layers 2 3 - Layers Number of ground plane cuts allowed within SATA routing region - - 0 Cuts Number of layers between SATA routing region and reference ground plane - - 0 Layers PCB trace width, w - 4 - Mils PCB BGA escape via pad size - 20 - Mils PCB BGA escape via hole size - 10 Mils MPU BGA pad size(1) 0.4 mm (1) NSMD pad, per IPC-7351A BGA pad size guideline. 8.18.2.4 Routing Specifications The SATA data signal traces must be routed to achieve 100 Ω (±20%) differential impedance and 60 Ω (±15%) single-ended impedance. The single-ended impedance is required because differential signals are extremely difficult to closely couple on PCBs and, therefore, single-ended impedance becomes important. 60 Ω is chosen for the single-ended impedance to minimize problems caused by too low an impedance. These impedances are impacted by trace width, trace spacing, distance to reference planes, and dielectric material. Verify with a PCB design tool that the trace geometry for both data signal pairs results in as close to 100 Ω differential impedance and 60 Ω single-ended impedance traces as possible. For best accuracy, work with your PCB fabricator to ensure this impedance is met. Table 8-102 shows the routing specifications for the SATA data signals. Table 8-102. SATA Routing Specifications PARAMETER MIN TYP MAX UNIT MPU-to-SATA header trace length 10(1) Inches Number of stubs allowed on SATA traces(2) 0 Stubs TX/RX pair differential impedance 80 100 120 Ω TX/RX single ended impedance 51 60 69 Ω Number of vias on each SATA trace 3 Vias(3) SATA differential pair to any other trace spacing 2*DS(4) (1) Beyond this, signal integrity may suffer. (2) In-line pads may be used for probing. (3) Vias must be used in pairs with their distance minimized. (4) DS = differential spacing of the SATA traces. 334 Peripheral Information and Timings Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM3874 AM3871 |
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