AM4376 datasheet(193/261 Pages) TI

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Rtt

Vtt

(A)

CACLMX

CACLMY

Rtt

Vtt

(A)

CACLMX

CACLMY

AM4376, AM4377, AM4378, AM4379

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SPRS851B – JUNE 2014 – REVISED APRIL 2015

It is very likely that the longest CK and 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 and ADDR_CTRL skew matching and length control.

The length of shorter CK and 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, CACLM = CACLMY + CACLMX + 300 mils.

The extra 300 mils allows for routing down lower than the DDR3 memories and returning up to reach A8.

Figure 5-76. CACLM for Two or Four Address Loads on One Side of PCB

Table 5-59. CK and ADDR_CTRL Routing Specification(1)(2)(3)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

A1+A2 length

2500

mils

A1+A2 skew

mils

A3 length

660

mils

A3 skew(4)

mils

A3 skew(5)

125

mils

Specifications

193

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AM4376 Datasheet(PDF) 193 Page - Texas Instruments

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