The LS1043a I2C can be used as PMB bus using software implementation for PMB bus. See the following document from TI for using PMBus Over I2C:
http://www.ti.com/lit/an/sprabj6/sprabj6.pdf
PMB bus is bus based on SMB bus.
See also the following page about difference between I2C bus and SMB bus:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/476
Have a great day,
Pavel Chubakov
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