AM5728 datasheet(204/415 Pages) TI1

204 / 415 page

xi_osc1

CK0

CK1

204

AM5729, AM5728, AM5726

SPRS953F – DECEMBER 2015 – REVISED MAY 2019

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Clock Specifications

(1) To switch from bypass mode to crystal or from crystal mode to bypass mode, there is a waiting time about 100 μs; however, if the chip

comes from bypass mode to crystal mode the crystal will start-up after time mentioned in Table 6-6, tsX parameter.

(2) Before the processor boots up and the oscillator is set to bypass mode, there is a waiting time when the internal oscillator is in

application mode and receives a wave. The switching time in this case is about 100 μs.

Table 6-8 details the OSC1 input clock timing requirements.

Table 6-8. OSC1 Input Clock Timing Requirements

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

CK0

1 /

tc(xiosc1)

Frequency, xi_osc1

Range from 12 to 38.4

MHz

CK1

tw(xiosc1)

Pulse duration, xi_osc1 low or high

0.45 *

tc(xiosc1)

0.55 *

tc(xiosc1)

tj(xiosc1)

Period jitter(1), xi_osc1

0.01 ×

tc(xiosc1)

(3)

tR(xiosc1)

Rise time, xi_osc1

tF(xiosc1)

Fall time, xi_osc1

tj(xiosc1)

Frequency accuracy(2), xi_osc1

Ethernet not used

±200

ppm

Ethernet RGMII and RMII

using derived clock

±50

Ethernet MII using derived

clock

±100

(1) Period jitter is meant here as follows:

–

The maximum value is the difference between the longest measured clock period and the expected clock period

–

The minimum value is the difference between the shortest measured clock period and the expected clock period

(2) Crystal characteristics should account for tolerance+stability+aging.

(3) The Period jitter requirement for osc1 can be relaxed to 0.02*tc(xiosc1) under the following constraints:

a.The osc1/SYS_CLK2 clock bypasses all device PLLs

b.The osc1/SYS_CLK2 clock is only used to source the DSS pixel clock outputs

Figure 6-9. xi_osc1 Input Clock

6.1.4

RTC Oscillator Input Clock

FUNC_32K_CLK is received directly from RTC Oscillator. For more information about FUNC_32K_CLK

see Device TRM, Chapter: Power, Reset, and Clock Management.

NOTE

RTC only mode is not supported feature.

6.1.4.1

RTC Oscillator External Crystal

An external crystal is connected to the device pins. Figure 6-10 describes the crystal implementation.

AM5728 Datasheet(PDF) 204 Page - Texas Instruments

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