Are 6Gb/s SAS drives compatible with 3Gb/s SAS interfaces?

Are SAS 3Gb/s controllers (SAS1) forward compatible with newer SAS2 drives specified at 6Gb/s? The controller I have in mind is an LSI SAS1064. I know that SAS2 controllers are backwards compatible with SAS devices. I found some information in this thread:

http://forums.seagate.com/t5/Savvio-Cheetah-and-Constellation/SAS-2-0-6GB-s-intercompatibility-with-SAS-3GB-s/td-p/35835

but not a lot at

http://www.lsi.com/products/storagecomponents/Pages/LSISAS1064.aspx