AMIC110 Datasheet, PDF (172/214 Pages) Texas Instruments – Sitara Processors

AMIC110
SPRS971A – AUGUST 2016 – REVISED SEPTEMBER 2016
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DQLMX0
DQ0
DQ[0:7], DM0, DQS0
DQ1 ^{DQ[8:15], DM1, DQS1}
DQLMX1
DQLMY1
DQLMY0
1
0
DQ0 - DQ1 represent data bytes 0 - 1.
There are two DQLMs, one for each byte (16-bit interface). Each DQLM is the longest Manhattan distance of the byte;
therefore:
DQLM0 = DQLMX0 + DQLMY0
DQLM1 = DQLMX1 + DQLMY1
Figure 7-53. DQLM for Any Number of Allowed DDR3 Devices
Table 7-52. DQS[x] and DQ[x] Routing Specification⁽¹⁾⁽²⁾
NO.
1 DQ0 nominal length⁽³⁾⁽⁴⁾
2 DQ1 nominal length⁽³⁾⁽⁵⁾
3 DQ[x] skew⁽⁶⁾
PARAMETER
MIN
TYP
MAX UNIT
DQLM0 mils
DQLM1 mils
25 mils
4 DQS[x] skew
5 DQS[x]-to-DQ[x] skew⁽⁶⁾⁽⁷⁾
6 Center-to-center DQ[x] to other DDR3 trace spacing⁽⁸⁾⁽⁹⁾
7 Center-to-center DQ[x] to other DQ[x] trace spacing^(8)(10)
8 DQS[x] center-to-center spacing⁽¹¹⁾
9 DQS[x] center-to-center spacing to other net⁽⁸⁾
5 mils
25 mils
4w
3w
4w
(1) DQS[x] represents the DQS0 and DQS1 clock net classes, and DQ[x] represents the DQ0 and DQ1 signal net classes.
(2) External termination disallowed. Data termination should use built-in ODT functionality.
(3) DQLMn is the longest Manhattan distance of a byte. For definition, see Section 7.7.2.3.6.2 and Figure 7-53.
(4) DQLM0 is the longest Manhattan length for the DQ0 net class.
(5) DQLM1 is the longest Manhattan length for the DQ1 net class.
(6) Length matching is only done within a byte. Length matching across bytes is not required.
(7) Each DQS clock net class is length matched to its associated DQ signal net class.
(8) Center-to-center spacing is allowed to fall to minimum for up to 1250 mils of routed length.
(9) Other DDR3 trace spacing means signals that are not part of the same DQ[x] signal net class.
(10) This applies to spacing within same DQ[x] signal net class.
(11) DQS[x] pair spacing is set to ensure proper differential impedance. Differential impedance should be Z_o x 2, where Z_o is the single-
ended impedance defined in Table 7-45.
172 Peripheral Information and Timings
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