Hi Jie,
Please refer below link for Keystone II device architecture.
http://processors.wiki.ti.com/index.php/Keystone_II_Device_Architecture
Please find the datasheet and all the technical documents in TI product folder.
http://www.ti.com/lsds/ti/dsp/keystone_arm/overview.page?paramCriteria=no
http://www.ti.com/product/<Part number>
Also, The Multi-core Software Development Kit (MCSDK) provides the core foundation building blocks that facilitate application software development on TI's high performance and multi-core SOCs. This software release gives developers the ability to evaluate major software capabilities of Keystone II family devices.
Download:http://software-dl.ti.com/sdoemb/sdoemb_public_sw/mcsdk/latest/index_FDS.html
User Guide: http://processors.wiki.ti.com/index.php/MCSDK_User_Guide_for_KeyStone_II
Please find the EVM information from below link.
http://www.advantech.com/Support/TI-EVM/EVMK2HX.aspx
Thanks.