Version 1.0
Page 23
Table 21
– RTC Crystal Pin Assignments
MIO NAME
PACKAGE PIN NUMBER
NET NAME JX3 CONNECTOR
PS_PADI
K17
PS_PADI
-
PS_PADO
K19
PS_PADO
-
VCC_PSBATT
N19
PS_VBATT
JX3.46
2.12 Control Signal Sources
2.12.1 Power-On Reset (PS_POR_N) and Carrier Card Reset (CC_RESET_OUT_N)
The Zynq Ult MPSoC PS supports an external power-on reset signal. The power-on reset is the
master reset of the entire chip. This signal resets every register in the device capable of being reset. On
UltraZed-EG SOM, this signal is labelled
PS_POR_B
and it is connected to push button,
SW3
. To stall Zynq
Ult MPSoC boot-up, this signal should be held low. No other signal (
PS_SRST_B, PROGRAM_B,
or INIT_B
) is capable of doing this as in other Xilinx FPGA architectures. Toggling
SW3
should illuminate
the
POR_RST_B
LED.
NOTE:
By default, the
SW3
push button is
NOT
populated on production level UltraZed-EG SOMs.
The power-on-reset,
PS_POR_B
, is capable of resetting the end-user carrier card thru an open drain signal
on the JX2 connector,
CC_RESET_OUT_N
. The UltraZed-EG SOM end-user is also capable of issuing a
soft reset,
P7_CC_RST_N,
to the end-user carrier card via an on board two-wire serial interface. The soft
reset is capable of resetting the end-user carrier card thru the same open drain signal on the JX2 connector,
CC_RESET_OUT_N
. The end-user carrier card is required to pull-up the
CC_RESET_OUT_N
signal to a
voltage level suitable to the circuitry on the end-user carrier card that requires this reset signal.
The active low reset,
P7_CC_RST_N
, is assigned to Port 7 of the Texas Instruments TCA9534 I/O
expander. The I/O expander is attached to an I2C peripheral on the Zynq Ult device. For further
information on the I/O expander and its connections, please locate the I/O expander section within this
hardware user guide.
NOTE: A custom end-user carrier card should design the on-board power solution to account for
the bring up time of the individual power supplies and devise a method to ensure that power is valid
prior to the booting of the Zynq Ult device. The custom end-user carrier card should use
the SOM_PG_OUT signal to enable the on-board power supplies.
NOTE: The time required for all power rails to be stable is approximately 400ms.
2.12.2 PS_PROG_B, PS_DONE, PS_INIT_B, PUDC_B, POR_OVERRIDE, and ERROR
PS_INIT_B
,
PS_PROG_B
and
PUDC_B
have pull-up resistors to appropriate voltages applied.
The
PS_PROG_B
signal is capable of being activated by push button,
SW1
. The
PUDC_B and
PORT_OVERRIDE
signals can be pulled high (default) or low through a resistor jumper.
NOTE:
By default, the
SW1
push button is
NOT
populated on production level UltraZed-EG SOMs.
There are several status LEDs on the UltraZed-EG SOM. There is a blue DONE LED indicator. When
configuration is complete
PS_DONE
will go high illuminating the blue DONE LED. There is a green ERROR
STATUS
LED indicator and a red ERROR OUT LED indicator that will illuminate indicating that configuration
did not complete properly via signal from
PS_ERROR_STATUS
and
PS_ERROR_OUT
.
