This is the version of the AS5912 that has external (extra) TCAM for more routes. There is a data sheet.
Broadcom Qumran-MX BCM88375 + BCM52311 TCAM
Curiously, Edge-core claims that this switch can run IOS-XR. It is a close cousin to the NCS5501, but not exactly the same.
The AS5916-54XL is a version of the XKS without TCAM.