User`s guide

22 NovaScale 4020 User’s Guide
NOTE
The BIOS automatically detects, sizes, and initializes the memory array,
depending on the type, size, and speed of the installed DIMMs. The
BIOS reports memory size and allocation to the system through
configuration registers.
The system does not support mixed-sized DIMMs or DIMMs from
different vendors within the same row.
DIMMs must be populated in groups of four, referred to as a row. Row 1 consists of DIMM
sockets 1-4 and row 2 consists of DIMM sockets 5-8. The DIMM sockets in each row are not
side-by-side; see Figure 18 to identify each socket and row.
Within a single row, all DIMMs must be identical, both in DIMM size and the number of
devices on the DIMM. Each of the two DIMM rows can be populated with DIMMs that use
different technologies, but for the best performance, the amount of memory on each MRH-D
DDR branch channel should be the same to enable the benefits of memory interleaving.
SCSI Controller
The LSI-531030 SCSI controller (U320) on the main board provides one primary channel to
internal SCSI backplane and a secondary channel via an external SCSI connector at the rear of
the chassis. This device interfaces to the SIOH at clock frequencies up to133MHz through one
channel of the primary P64H2, also located on the main board. The 53C1030 is a fully
autonomous device, capable of managing multiple I/O operations and associated data transfers
from start to finish without host intervention.
While the internal channel supports only Low Voltage Differential (LVD) signaling, the
external channel supports both LVD and SE (single-ended) signaling. With LVD signaling, the
channels can each support a maximum data rate of 320 MB/sec.
Network Interface Controller
The onboard network interface is comprised of one Intel 82546EB Dual Port Gigabit Ethernet
controller connected to the second channel of the primary P64H2 PCI-X bridge, located on the
main board, at clock frequencies up to133MHz. The 82546EB is a single component with two
fully IEEE 802.3 compliant Ethernet interfaces. It provides two stacked RJ45 ports at the rear
of the chassis.
This network interface supports Ethernet applications at 1000Base-T, 100Base-T, and 10Base-T
(802.3, 802.3u and 802.3ab) and enables network manageability implementations required for
remote control and alert over LAN.