AM3359 datasheet(102/195 Pages) TI

102 / 195 page

AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

SPRS717B

– OCTOBER 2011 – REVISED JANUARY 2012

www.ti.com

Peripheral Information and Timings

The AM335x device contains many peripheral interfaces. In order to reduce package size and cost while

maintaining maximum functionality, many of the AM335x terminals can multiplex up to eight signal

functions. Although there are many combinations of pin multiplexing that are possible, only a certain

number of sets, called IO sets, are valid due to timing limitations. These valid IO sets were carefully

chosen to provide many possible application scenarios for the user.

Texas Instruments has developed a Windows application called Pin Mux Utility that helps a system

designer select the appropriate pin-multiplexing configuration for their AM335x-based product design. This

tool provides a way to select valid IO sets of specific peripheral interfaces to ensure that the

pin-multiplexing configuration selected for a design only uses valid IO sets supported by the AM335x

device.

5.1

Parameter Information

5.1.1

Timing Parameters and Board Routing Analysis

The timing parameter values specified in this data manual do not include delays by board routings. As a

good board design practice, such delays must always be taken into account. Timing values may be

adjusted by increasing/decreasing such delays. TI recommends utilizing the available I/O buffer

information specification (IBIS) models to analyze the timing characteristics correctly. If needed, external

logic hardware such as buffers may be used to compensate any timing differences.

For the mDDR(LPDDR)/DDR2/DDR3 memory interface, it is not necessary to use the IBIS models to

analyze timing characteristics. TI provides a PCB routing rules solution that describes the routing rules to

ensure the mDDR(LPDDR)/DDR2/DDR3 memory interface timings are met.

5.2

Recommended Clock and Control Signal Transition Behavior

All clocks and control signals must transition between VIH and VIL (or between VIL and VIH) in a monotonic

manner.

102

Peripheral Information and Timings

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AM3359 Datasheet(PDF) 102 Page - Texas Instruments