AM4376 datasheet(205/261 Pages) TI

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CACLMY

CACLMX

CACLM = CACLMX + CACLMY

LPDDR2

interface

AM4376, AM4377, AM4378, AM4379

www.ti.com

SPRS851B – JUNE 2014 – REVISED APRIL 2015

CACLM is the longest Manhattan distance of the CK/ADDR_CTRL signal class.

Figure 5-92. CACLM for LPDDR2 Interface

Trace routing specifications for the CK and the ADD_CTRL are specified in Table 5-70.

Table 5-70. CK and ADDR_CTRL Routing Specification

NO.

PARAMETER

MIN

TYP

MAX

UNIT

CK and ADDR_CTRL nominal trace length(1)

CACLM

mils

ADDR_CTRL skew

mils

CK skew

mils

Via count per each trace ADDR_CTRL, CK

Via count difference across ADDR_CTRL, CK

ADDR_CTRL-to-CK skew

mils

Center-to-center ADDR_CTRL to other LPDDR2 trace spacing(2)(3)

Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(2)

CK center-to-center spacing(4)

CK center-to-center spacing to other net(2)

(1) CACLM is the longest Manhattan distance of ADDR_CTRL and CK.

(2) Center-to-center spacing is allowed to fall to minimum for up to 1000 mils of routed length.

(3) Other LPDDR2 trace spacing means signals that are not part of the same CK, ADDR_CTRL signal net class.

(4) CK pair spacing is set to ensure proper differential impedance. Differential impedance should be Zo x 2, where Zo is the single ended

impedance.

Specifications

205

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