Processor Subsystem; Processor Packaging; Second-Level Cache - NEC POWERMATE PROFESSIONAL 9000 Service Manual

1-12 Technical Information

Processor Subsystem

The system board supports a single or dual Intel Pentium II processor configuration with an
internal clock speed of 233 MHz, 266 MHz, 300 MHz, or 333 MHz. Each processor uses
Intel MMX technology.
The processor's voltage ID pins automatically program the voltage regulator on the system
board to the required processor voltage. The system board supports processors that have a
512-KB second-level cache and identical processor voltages. To ensure reliable operation,
only Pentium II processors with fan/heatsinks can be installed on the DK440LX system
board.
The processor is compatible with 8-, 16-, and 32-bit software written for the Intel386™,
Intel486™, Pentium, and Pentium Pro processors. The Pentium II processor is mounted on
a CPU card with an attaching heatsink that installs as a unit (CPU subsystem) in Slot 1 on
the system board.
The processor is an advanced pipelined 32-bit addressing, 64-bit data processor designed to
optimize multitasking operating systems. The 64-bit registers and data paths support 64-bit
addresses and data types.

Processor Packaging

The processor is packaged in a Single Edge Contact (SEC) cartridge. The cartridge includes
the processor core, second-level cache, thermal plate, and back cover. The processor
connects to the system through the Slot 1 connector, a 242-pin edge connector mounted on
the system board. When mounted in the Slot 1 connector(s), each processor is secured by
the retention mechanism (RM) attached to the system board. For more information, see
"Processor Upgrades" later in this section.

Second-Level Cache

To use the Pentium processor's power, the system features an optimized 64-bit memory
interface and 512 KB of second-level write-back cache on the processor.
The second-level cache is located on the substrate of the SEC cartridge. The cache includes
burst pipelined synchronous static RAM (SBRAM) and tag RAM. The cache consists of
four BSRAM components totaling 512 KB in size. A maximum of 512 MB of system
memory is cacheable. ECC or non-ECC support is provided in the cache.
NOTE: Single-processor configurations require
that a terminator card be installed in the second
processor slot (see "Processor Upgrades" later in
this section).