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2.6. Resets

The MCC on the motherboard controls the daughterboard reset signals. Figure 2.10 shows the reset request signals from the daughterboard, and the reset signals from the motherboard.

Reset requests from the daughterboard can originate in the FPGA or from the P-JTAG connector. A reset request from the P-JTAG connector connects to CB_RSTREQ through the FPGA and the Daughterboard Configuration Controller. A reset request from the FPGA connects to CB_RSTREQ through the Daughterboard Configuration Controller.

The reset request from the daughterboard results in the motherboard asserting CB_nRST. CB_nPOR can optionally be asserted by the setting ASSERTNPOR, that can be TRUE or FALSE in the config.txt motherboard configuration file. See the ARM® Versatile™ Express Configuration Technical Reference Manual for an example config.txt file.

Note

Only the CB_nPOR and CB_nRST signals are driven to the daughterboard FPGA and Daughterboard Configuration Controller. CB_RSTREQ can be driven from the FPGA through the Daughterboard Configuration Controller to request a cold or warm reset, depending on the motherboard configuration file settings.

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Figure 2.11 shows the basic power-up reset cycle.

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