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Adventurer
Adventurer
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Registered: ‎06-22-2018

The initial port state of AXI SPI

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In PG153 it shows the  active low output ports have initial status of '1', but other outputs show '-'. So, what's the meaning of '-'. And what's the inital status of them?

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Community Manager
Community Manager
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Registered: ‎07-23-2012

From Table 2-2, you will see that the default value of Outputs are not defined for bi-directional ports (like IO0_O). These bidirectional ports have a tristate pin which determines the value driven on the output port.

As per the same table, the default value of these tri-state pins are 1 which means that the output ports will be in tri-state.

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Xilinx Employee
Xilinx Employee
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Registered: ‎01-21-2008

Hi @diverger

Table 2-2 shows the  input anf output of the IP. Most of the OUTPUT signals are driven by the command and some are depends on the command acts as a bidirectional. Once you have generated the IP in Vivado design, please see the output signals in simulation for correct usacase for your configuration options. 

So Most of the signals are configuration driven outputs and that is the reason we have mentioned "-" in table 2-2.

 

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Community Manager
Community Manager
561 Views
Registered: ‎07-23-2012

From Table 2-2, you will see that the default value of Outputs are not defined for bi-directional ports (like IO0_O). These bidirectional ports have a tristate pin which determines the value driven on the output port.

As per the same table, the default value of these tri-state pins are 1 which means that the output ports will be in tri-state.

-----------------------------------------------------------------------------------------------
Please mark the post as "Accept as solution" if the information provided answers your query/resolves your issue.

Give Kudos to a post which you think is helpful.

View solution in original post

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