SPI and GDO, what is GDO an acronym for?

In connection with a SPI bus there is typically a number of GDO pins used for interrupt开发者_如何学运维ing the master or the slave of the SPI connection. But what is GDO an acronym for?

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General Digital Output

See for example http://focus.ti.com/lit/ds/symlink/cc2500.pdf.