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AM3359 Datasheet(PDF) 155 Page - Texas Instruments

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Part # AM3359
Description  Sitara??AM335x ARM짰 Cortex??A8 Microprocessors (MPUs)
PDF  236 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AM3359 Datasheet(HTML) 155 Page - Texas Instruments

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AM3359, AM3358, AM3357
AM3356, AM3354, AM3352
www.ti.com
SPRS717F – OCTOBER 2011 – REVISED APRIL 2013
5.6.2.1.2.9 LPDDR Signal Termination
There is no specific need for adding terminations on the LPDDR interface. However, system designers
may evaluate the need for serial terminators for EMI and overshoot reduction. Placement of serial
terminations for DQS[x] and DQ[x] net class signals should be determined based on PCB analysis.
Placement of serial terminations for ADDR_CTRL net class signals should be close to the AM335x device.
Table 5-40 shows the specifications for the serial terminators in such cases.
Table 5-40. LPDDR Signal Terminations
No.
Parameter
Min
Typ
Max
Unit
1
CK net class(1)
0
22
Zo(2)
ohms
2
ADDR_CTRL net class(1)(3)(4)
0
22
Zo(2)
ohms
3
DQS0, DQS1, DQ0, and DQ1 net classes
0
22
Zo(2)
ohms
(1) Only series termination is permitted.
(2) Zo is the LPDDR PCB trace characteristic impedance.
(3) Series termination values larger than typical only recommended to address EMI issues.
(4) Series termination values should be uniform across net class.
Copyright © 2011–2013, Texas Instruments Incorporated
Peripheral Information and Timings
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