Preliminary UG-XXXX
EVAL-ADIN1110EBZ User Guide
Rev. PrA | Page 8 of 23
CLOCK OPTIONS
The crystal oscillators on the EVAL-ADIN1110EBZ include the
following:
•
Y1 is a 32.768 kHz crystal used for the on-board
ADuCM4050.
•
Y2 is a 26 MHz crystal used for the on-board
ADuCM4050.
•
Y3 is a 25 MHz crystal connected across the XTAL_I pin
and XTAL_O pin of the ADIN1110.
As shown in Figure 12, the EVAL-ADIN1110EBZ provides the
option to supply the ADIN1110 clock requirements from either
an on-board crystal oscillator (Y3), or an external clock
(EXT_CLK) applied to the J1 connector.
Figure 12. Schematic snapshot – clocking options
When a 25 MHz external clock is applied to the J1 connector,
the R86 resistor must be populated and the R72 and R87
resistors must be removed to disconnect the Y3 crystal. The
25 MHz clock must be a sine or square wave signal with an
input range of 0.8 Vpk-pk to 2.5 Vpk-pk. See the ADIN1110
data sheet for more information. For RMII mode, a 50 MHz
clock must be used.
In either of the cases where an external clock, other than the
on-board 25 MHz crystal, is being provided to the ADIN1110,
this signal must be capacitively coupled and divided down such
that the maximum amplitude does not exceed 2.5 Vp-p. If the
clock signal is less than 2.5 Vpk-pk, then C18 is not required
and a 1 nF coupling capacitor (C55) is recommended. If the
clock signal is greater than 2.5 Vpk-pk, then C18 should be
10pF and C55 chosen such that the signal does not exceed 2.5
Vpk-pk.
The ADIN1110 also provides a 25 MHz reference clock output
from the crystal oscillator on the CLK25_REF pin, which is
available on the P7 header and can also optionally be used to
drive the ADuCM4050 clock (alternative to 26 MHz crystal
which is the default configuration).
RESET OPTIONS
The S5 push-button switch is used to reset both the ADIN1110
MAC-PHY and the ADuCM4050 microcontroller (P8 is by
default in the “BUTTON RESET” position – see Figure 13).
Alternatively, the RESET_N MAC-PHY signal can be driven
from the ADuCM4050 output (signal name =
uC_to_PHY_RESET). The P8 link also facilitates the option to
hold the ADuCM4050 in reset using the “GND RESET”
position.
Figure 13. EVAL-ADIN1110EBZ reset options.
ON-BOARD FLASH MEMORY
The EVAL-ADIN1110EBZ also has an SPI 64Mbit Flash
Memory, U6, which can be used to store the board type,
revision and board unique ID.
PROGRAMMING THE ADUCM4050
The ADuCM4050 is programmed out-of-the box, so unless a
new hex file is being downloaded to the ADuCM4050, it is not
necessary to program it in order to use the EVAL-
ADIN1110EBZ evaluation board. The default behavior of the
configuration switches based on the pre-loaded firmware is
listed in Table 5. The current revision of the firmware can be
viewed using a UART terminal window and pressing the
RESET push-button-switch (S5) – example shown in Figure 15:
“Firmware ver.: 5.1”.
In order to program the ADuCM4050, use the following steps:
1.
Ensure the mini USB cable is connected between the
EVAL-ADIN1110EBZ board and the PC and open the
CrossCore serial flash programmer software.
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