Sun SME2530 Any ideas what it is?

[CPUShack]

Feels like a fairly substantial chip
SME2530PBGA-200
Marked with IBM info too

[Neon_WA]

JIO
JBUS to PCI Bridge ASIC

JIO is a companion core-logic ASIC to the Sparc III i-series 64-bit SPARC V9 CPU.
JIO and Sparc IIIi communicate through a split transaction 16-byte shared address/
data bus, which is known as Jbus. The central task of JIO is to be the point of access
to I/O, graphics, and system interrupts, for a uni-processor up to a four-way
symmetric multi-processor Sparc IIIi-based system. For those familiar with the Intel
system hardware partitioning, JIO is the equivalent of an Intel Northbridge, minus
the interface to main-memory. The interface to main-memory comes directly off the
Sparc IIIi CPU in our case. It is allowable for a given system to be configured with
more than one JIO, if added I/O bandwidth is desired.

The JIO ASIC contains these major logical components:
n Jbus Interface Unit
n PCI Interface Unit
n Graphics Interface Unit
n PCI I/O Cache Unit
n Graphics I/O Cache Unit
n Synchronizer Unit

Sun datasheet