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DM505LRBABF Datasheet(PDF) 279 Page - Texas Instruments |
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DM505LRBABF Datasheet(HTML) 279 Page - Texas Instruments |
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279 / 295 page  = Rtt A2 A3 AT Vtt A8 (A) A8 (A) A8 (A) CACLMX CACLMY SPRS91v_PCB_DDR3_27 279 DM505 www.ti.com SPRS976E – NOVEMBER 2016 – REVISED MAY 2018 Submit Documentation Feedback Applications, Implementation, and Layout Copyright © 2016–2018, Texas Instruments Incorporated A. It is very likely that the longest CK/ADDR_CTRL Manhattan distance will be for Address Input 8 (A8) on the DDR3 memories. CACLM is based on the longest Manhattan distance due to the device placement. Verify the net class that satisfies this criteria and use as the baseline for CK/ADDR_CTRL skew matching and length control. The length of shorter CK/ADDR_CTRL stubs as well as the length of the terminator stub are not included in this length calculation. Non-included lengths are grayed out in the figure. Assuming A8 is the longest, CALM = CACLMY + CACLMX + 300 mils. The extra 300 mils allows for routing down lower than the DDR3 memories and returning up to reach A8. Figure 7-70. CACLM for Two Address Loads on One Side of PCB Table 7-44. CK and ADDR_CTRL Routing Specification(2)(3) NO. PARAMETER MIN TYP MAX UNIT CARS31 A1+A2 length 500(1) ps CARS32 A1+A2 skew 29 ps CARS33 A3 length 125 ps CARS34 A3 skew(4) 6 ps CARS35 A3 skew(5) 6 ps CARS36 A4 length 125 ps CARS37 A4 skew 6 ps CARS38 AS length 5 17(1) ps CARS39 AS skew 1.3 14(1) ps CARS310 AS+/AS- length 5 12 ps CARS311 AS+/AS- skew 1 ps CARS312 AT length(6) 75 ps CARS313 AT skew(7) 14 ps CARS314 AT skew(8) 1 ps CARS315 CK/ADDR_CTRL trace length 1020 ps CARS316 Vias per trace 3(1) vias CARS317 Via count difference 1(15) vias CARS318 Center-to-center CK to other DDR3 trace spacing(9) 4w CARS319 Center-to-center ADDR_CTRL to other DDR3 trace spacing(9)(10) 4w CARS320 Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(9) 3w |
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