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3-Feb-2015
17
Table 13
– PicoZed 7010/7020 Configuration Modes
BOOT MODE
JT4
SW1 (1-3)
SW1 (4-6)
QSPI
X
LOW (2-3)
HIGH (4-5)
SD CARD *
X
HIGH (1-2)
HIGH (4-5)
JTAG *
X
LOW (2-3)
LOW (5-6)
INDEP JTAG *
HIGH (2-3)
LOW (2-3)
LOW (5-6)
CASCADE JTAG *
LOW (1-2)
LOW (2-3)
LOW (5-6)
*Interfaces on the End User Carrier Card
QSPI BOOT MODE
SD CARD BOOT MODE
Figure 4: PicoZed 7010/7020 Boot Mode Switch
Expected configuration time using a 50MB/s QSPI flash is 250ms.
Zynq has many other configuration options; PicoZed 7010/7020 uses this configuration:
V
CCO_0
is tied to 3.3V on PicoZed 7010/7020.
PUDC_B can be pulled high or low on PicoZed 7010/7020 via a resistor (JT5). This
active-low input enables internal pull-ups during configuration on all SelectIO pins. By
default, JT5 is populated with a 1K resistor in the 1-2 position, which pulls up PUDC_B
and disables the pull-ups during configuration. PUDC_B is shared with Bank 34 I/O
IO_L3P and is connected to the Micro Header.
Init_B is pulled high via a 4.7K
Ω resistor (RP2.2), but also connected to the Micro
Header.
Program_B is pulled high via a 4.7K
Ω resistor (RP2.4).
CFGBVS is pulled high via a 4.7K
Ω resistor (RP2.1).
The PS is responsible for configuring the PL. Zynq will not automatically reconfigure the PL as in
standard FPGAs by toggling PROG. Likewise, it is not possible to hold off Zynq boot up with
INIT_B as this is now done with POR. If the application needs to reconfigure the PL, the software
design must do this, or you can toggle POR to restart everything. When PL configuration is
complete and the end user is using the Avnet PicoZed FMC Carrier Card, a blue LED will
illuminate.
2.9.1
JTAG Connections
PicoZed 7010/7020 requires an external JTAG cable connector populated on the carrier card for
JTAG operations. JTAG signals are routed from Bank 0 of the Zynq to the Micro Header JX1.
The following table shows the JTAG signal connections between the Zynq and the Micro Header.
The Zynq Bank 0 reference voltage, Vcco_0, is connected to 3.3V. The JTAG Vref on the End
User Carrier Card should be connected to 3.3V to ensure compatibility between the interfaces.
For reference, see the PicoZed FMC Carrier Card schematics.