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Sun Microsystems, Inc.
UltraSPARC T2 Processor Architecture
The UltraSPARC T2 processor extends Sun’s Throughput Computing initiative with an
elegant and robust architecture that delivers real performance to applications. A high-
level block diagram of the UltraSPARC T2 processor is shown in Figure 5.
Figure 5. The UltraSPARC T2 processor combines eight cores, memory management, cryptographic
support, 10 Gb Ethernet, and PCI Express on a single chip
The eight cores on the UltraSPARC T2 processor are interconnected with a full on-chip
non-blocking 8 x 9 crossbar switch. The crossbar connects each core to the eight banks
of L2 cache, and to the system interface unit for IO. The crossbar provides
approximately 300 GB/second of bandwidth and supports 8-byte writes from a core to a
bank and 16-byte reads from a bank to a core. The system interface unit connects
networking and I/O directly to memory through the individual cache banks. Using
FBDIMM memory supports dedicated northbound and southbound lanes to and from
the caches to accelerate performance and reduce latency. This approach provides
higher bandwidth than with DDR2 memory, with up to 42.4 GB/second of read
bandwidth and 21 GB/second of write bandwidth.
Each core provides its own fully-pipelined floating point and graphics unit (FGU), as well
as a stream processing unit (SPU). The FGUs greatly enhance floating point
performance over that of the UltraSPARC T1, while the SPUs provide wire-speed
cryptographic acceleration with over 10 popular ciphers supported, including DES,
Cross Bar
L2$ L2$ L2$ L2$ L2$ L2$ L2$ L2$
C0
C1 C2 C3
C4 C5 C6
C7
FPU FPU FPU FPU FPU FPU FPU FPU
System Interface
Network
Interface Unit
PCIe
10 Gigabit
Ethernet Ports (2)
x8 @ 2.0 GHz
FB DIMM FB DIMM FB DIMM
FB DIMM
FB DIMM FB DIMM FB DIMM
FB DIMM
SPU SPU SPU SPU SPU SPU SPU SPU
MCU MCU MCU
MCU