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3-Feb-2015
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2.9 Configuration Modes
Zynq-7000 AP SoC devices use a multi-stage boot process that supports both non-secure and
secure boot. The PS is the master of the boot and configuration process. Upon reset, the device
mode pins are read to determine the primary boot device to be used: NOR, NAND, Quad-SPI, SD
Card or JTAG. PicoZed 7010/7020 allows 3 of those boot devices: QSPI is the default, while SD
Card and JTAG boot are easily accessible by changing switch settings.
Note: SD Card and JTAG interfaces should be implemented on the end user carrier card.
Zynq has Voltage Mode pins, which are fixed on PicoZed 7010/7020
The boot mode pins are shared with MIO[8:2]. The usage of these mode pins can be and are
used as follows:
MIO[2] / Boot_Mode[3]
o
sets the JTAG mode
MIO[5:3] / Boot_Mode[2:0]
o
select the boot mode
o
Boot_Mode[1] is fixed since it is only required for NOR boot, which is not
supported on PicoZed 7010/7020
MIO[6] / Boot_Mode[4]
o
enables the internal PLL
o
fixed to ‘enabled’ on PicoZed 7010/7020
MIO[8:7] / Vmode[1:0]
o
configures the I/O bank voltages
o
fixed on PicoZed 7010/7020
o
MIO Bank 0 / 500 (MIO[7] / Vmode[0]) set to ‘0’ for 3.3V
o
MIO Bank 1 / 501 (MIO[8] / Vmode[1]) set to ‘1’ for 1.8V
All mode pins are pulled either high
or low through a 20 KΩ resistor that is either hard wired or
connected to a switch or resistor jumper. By default, four mode signals are not jumper-adjustable
and are populated as follows:
MIO[3] / Boot_Mode[1] is pulled low
via 20 KΩ resistor.
MIO[6] / Boot_Mode[4] is
pulled low via 20 KΩ resistor.
MIO[7] / Vmode[0] is pulled low via 20
KΩ resistor.
MIO[8] / Vmode[1] is pulled high via 20
KΩ resistor.
The other three mode signals, MIO[2], MIO[4] and MIO[5], are configurable via a jumper resistor
or switch setting.
MIO[2] is pulled either high or low via a 0 ohm resistor jumper JT4. Default setting from the
factory is pulled low (position 1-2) and puts the Zynq in Cascade JTAG mode.
MIO[5:4] is pulled high or low via a two channel dip switch SW1. Setting the switch positions will
determine whether the Zynq boots from QSPI, the microSD card, or JTAG.
The table below shows the available boot mode configuration setting using JT4 and SW1.