
44 IBM BladeCenter JS23 and JS43 Implementation Guide
POWER6 processor modules on IBM BladeCenter JS23 Express and
JS43 Express
IBM BladeCenter JS23 Express comes with 2 POWER6 processor modules
(4-way), and IBM BladeCenter JS43 Express comes with two additional
POWER6 modules (total 8-way).
Each POWER6 modules is 4-way Dual Core Module (DCM), containing two 64bit
2-core POWER6 processors (4.2GHz) and one 32MB L3 cache.
Figure 3-1 shows a high-level view of the POWER6 module present in the JS23
and JS43 Express servers.
Figure 3-1 POWER6 processor module (4-way DMC)
3.1.1 Decimal floating point
This section describes the behavior of the decimal floating-point processor, the
supported data types, formats, and classes, and the usage of registers. The
decimal floating-point (DFP) processor shares the 32 floating-point registers
(FPRs) and the floating-point status and control register (FPSCR) with the binary
floating-point (BFP) processor. However, the interpretation of data formats in the
FPRs, and the meaning of some control and status bits in the FPSCR are
different between the BFP and DFP processors.
The DFP processor supports three DFP data formats: DFP32 (single precision),
DFP64 (double precision), and DFP128 (quad precision). Most operations are
performed on the DFP64 or DFP128 format directly. Support for DFP32 is limited
to conversion to and from DFP64. For some operations, the DFP processor also
DCM
32MB L332MB L3
2x Memory Ctrl2x Memory Ctrl
POWER6 chip 2
I/O CtrlI/O CtrlL3 Ctrl DirectoryL3 Ctrl Directory
4MB L24MB L2
2x Memory Ctrl2x Memory Ctrl
POWER6 chip 1
Fabric SwitchFabric Switch
I/O CtrlI/O Ctrl L3 Ctrl DirectoryL3 Ctrl Directory
POWER6
Core 1
4.2GHz
POWER6
Core 1
4.2GHz
ALTIVECALTIVEC
POWER6
Core 1
4.2GHz
POWER6
Core 1
4.2GHz
ALTIVECALTIVEC
POWER6
Core 1
4.2GHz
POWER6
Core 1
4.2GHz
ALTIVECALTIVEC
POWER6
Core 1
4.2GHz
POWER6
Core 1
4.2GHz
ALTIVECALTIVEC
Fabric SwitchFabric Switch
4MB L24MB L2 4MB L24MB L2 4MB L24MB L2
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