40
MCIMX53SMD Board Hardware User’s Guide, Rev. 0
Freescale Semiconductor
The 32.768 kHz crystal (QZ3) is the clock source used by the i.MX53 processor for the Secure Real Time Clock
module. It receives power from the NVCC_SRTC pin, which is connected to the VLDO1 1.3V voltage regulator.
The 32.768 kHz clock signal is not sent anywhere else on the MCIMX53SMD board. The location of the crystal
is also shown in
Figure 5-3
.
Figure 5-3.
Clock Source Locations (Top)
The clock source for the Ethernet PHY is a 50 MHz Oscillator (X1) with an enable pin and is shown in
Figure 5-
4
. The oscillator was originally placed to support both the SATA module and the Ethernet PHY. It is no longer
used for the SATA module, and only supplies a clock signal to the Ethernet PHY. It is powered by the
DCDC_3V3 power rail and, by default, and can be shut by GPIO SATA_CLK_GPEN.
Y
1
Q
Z
3
Y
3
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