PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2430&OB=ASC.html
). I did a search on the web for info on BGA land patterns and I found this page from TI: http://processors.wiki.ti.com/index.php/General_hardware_design/BGA_PCB_design Pad size is the first topic discussed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_bga-footprint_topic2430.xml
).I did a search on the web for info on BGA land patterns and I found this page from TI:http://processors.wiki.ti.com/index.php/General_hardware_design/BGA_PCB_designPad size is the first topic discussed. 
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/bga-chamfer_topic727_post2522.html
Symbol Expert - BETA TEST PCB Library Construction Guidelines Footprints / Land Patterns - Allegro - Altium - Board Station - CADSTAR - CircuitStudio - CR-5000 - EAGLE - Expedition - DesignSpark - DipTrace - KiCad - OrCAD Layout
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic727&OB=ASC.html
Symbol Expert - BETA TEST PCB Library Construction Guidelines Footprints / Land Patterns - Allegro - Altium - Board Station - CADSTAR - CircuitStudio - CR-5000 - EAGLE - Expedition - DesignSpark - DipTrace - KiCad - OrCAD Layout
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/bga-pad-size_topic2607_post10645.html
devices with less than 1.0mm pitch which (according to IPC) requires 10% reduction. 14.2.4 Attachment Site Planning The attachment site or land pattern geometry recommended for BGA devices is round with the diameter adjusted to meet contact pitch and size variation
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/bga-pad-size_topic2607_post12477.html
devices with less than 1.0mm pitch which (according to IPC) requires 10% reduction. 14.2.4 Attachment Site Planning The attachment site or land pattern geometry recommended for BGA devices is round with the diameter adjusted to meet contact pitch and size variation
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/bga-pad-size_topic2607_post11390.html
devices with less than 1.0mm pitch which (according to IPC) requires 10% reduction. 14.2.4 Attachment Site Planning The attachment site or land pattern geometry recommended for BGA devices is round with the diameter adjusted to meet contact pitch and size variation
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/bga-pad-size_topic2607_post10649.html
devices with less than 1.0mm pitch which (according to IPC) requires 10% reduction. 14.2.4 Attachment Site Planning The attachment site or land pattern geometry recommended for BGA devices is round with the diameter adjusted to meet contact pitch and size variation
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic2531&OB=DESC.html
Product Suggestions Symbol Expert - BETA TEST PCB Library Construction Guidelines Footprints / Land Patterns - Allegro - Altium - Board Station - CADSTAR - CircuitStudio - CR-5000 - EAGLE - Expedition - DesignSpark - DipTrace
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2531&OB=ASC.html
Symbol Expert - BETA TEST PCB Library Construction Guidelines Footprints / Land Patterns - Allegro - Altium - Board Station - CADSTAR - CircuitStudio - CR-5000 - EAGLE - Expedition - DesignSpark - DipTrace - KiCad - OrCAD Layout