AM3517 datasheet(89/218 Pages) TI

89 / 218 page

AM35x

Power IC

sys_32k

sys_altclk

sys_clkout1

Alternate Clock Source Selectable (54, 48 MHz or other [up

to 59 MHz])

To Quartz (Oscillator output) or Unconnected

From Quartz (Oscillator input), Square Clock, or Crystal

Clock Request. To Square Clock Source or from Peripherals

Oscillator

is Used

Oscillator

is Bypassed

Unconnected

Square

Clock

Source

To Peripherals (From OSC_CLK: 26 MHz, core_clk

[DPLL, up to 166 MHz], DPLL-96 MHZ or DPLL-54 MHz

outputs with a divider of 1, 2, 4, 8, or 16)

GPin

To Peripherals (From OSC_CLK: 26 MHz)

sys_clkout2

sys_xtalout

sys_xtalin

sys_clkreq

sys_xtalout

sys_xtalin

sys_clkreq

sys_xtalout

sys_xtalin

sys_clkreq

030-007

Ethernet input 50-MHz clock

rmii_50mhz_clk

AM3517, AM3505

www.ti.com

SPRS550A – OCTOBER 2009 – REVISED MAY 2010

CLOCK SPECIFICATIONS

The AM3517/05 device has three external input clocks, a low frequency (sys_32k), a high frequency

(sys_xtalin), and an optional (sys_altclk). The AM3517/05 device has two configurable output clocks,

sys_clkout1 and sys_clkout2.

Figure 4-1 shows the interface to the external clock sources and clock outputs.

Figure 4-1. Clock Interface

The AM3517/05 device operation requires the following three input clocks:

•

The 32-kHz clock can be generated using one of the following options and can be selected via the

sys_boot7 pin. See Figure 4-2.

–

External: Supplied by an oscillator on the sys_32k pin.

–

Internal: 32-kHz clock generation using a fixed divider on the HS system clock (26MHz).

•

The system alternative clock can be used (through the sys_altclk pin) to provide alternative 48 or 54

MHz or other clock source (up to 54 MHz).

•

The system clock input (26 MHz) is used to generate the main source clock of the AM3517/05 device.

It supplies the DPLLs as well as several AM3517/05 modules. The system clock input can be

connected to either:

–

A crystal oscillator clock managed by sys_xtalin and sys_xtalout. In this case, the sys_clkreq is

used as an input (GPIN).

–

A CMOS digital clock through the sys_xtalin pin. In this case, the sys_clkreq is used as an output to

request the external system clock.

CLOCK SPECIFICATIONS

Submit Documentation Feedback

Product Folder Link(s): AM3517 AM3505

AM3517 Datasheet(PDF) 89 Page - Texas Instruments

AM3517 Datasheet(HTML) 89 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL