Table of Contents
Advertisement
M a i n b o a r d
SCSI controller
The baseboard includes two SCSI controllers. A narrow SCSI controller (SYM53C810AE) is on
the PCI-A bus, and a dual-channel wide LVD/SE (Ultra2/Ultra) SCSI controller (SYM53C896) is
on the PCI-B bus. The narrow provides support for the legacy 8-bit SCSI devices in the 5.25-inch
drive bays. The wide drives one SCSI backplane and provides support for external expansion.
Internally, each wide channel is identical, capable of operations using either 8- or 16-bit SCSI
providing 10 MB/sec (Fast-10) or 20 MB/sec (Fast-20) throughput, or 20 MB/sec (Ultra) or
40 MB/sec (Ultra-wide).
The SYM53C810AE (narrow) contains a high-performance SCSI core capable of Fast 8-bit SCSI
transfers in single-ended mode. It provides programmable active negation, PCI zero wait-state
bursts of faster than 110 MB/sec at 33 MHz, and SCSI transfer rates from 5 to 10 MB/sec. The
narrow SCSI comes in a 100-pin rectangular plastic quad flat pack (PQFP) and provides an "AND
tree" structure for testing component connectivity.
The Sym53C896 (wide) contains a high-performance SCSI bus interface. It supports SE mode
with 8-bit (10 or 20 MB/sec) or 16-bit (20 or 40 MB/sec) transfers and LVD mode with
8-bit (40 MB/sec) or 16-bit (80 MB/sec) transfers in a 329-pin ball grid array (BGA) package.
Each controller has its own set of PCI configuration registers and SCSI I/O registers. As a
PCI 2.1 bus master, the SYM53C896 supports burst data transfers on PCI up to the maximum
rate of 132 MB/sec using on-chip buffers.
In the internal bay, the system supports up to six one-inch SCSI hard disk drives, plus, in the
5.25-inch removable media bays, two SCSI devices (the controller itself supports more devices, but
the chassis can contain a maximum of eight). A wide SCSI cable provides two connectors for Ultra
SCSI devices. However, SCSI devices do not need to operate at the ultra transfer rate. Each SCSI
channel runs at the speed of the slowest device on the channel.
No logic, termination, or resistor loads are required to connect devices to the SCSI controller other
than termination in the device at the end of the cable. The SCSI bus is terminated on the
baseboard with active terminators that can be disabled.
IDE controller
IDE is a 16-bit interface for intelligent disk drives with AT disk controller electronics onboard.
The PCI/ISA/IDE Accelerator, called PIIX4E, is a multifunction device on the baseboard that acts
as a PCI-based Fast IDE controller.
The device controls:
PIO and IDE DMA/bus master operations
Mode 4 timings
Transfer rates up to 22 MB/sec
Buffering for PCI/IDE burst transfers
Master/slave IDE mode
Up to two drives for one IDE channel
5/18
FT5000 HANDBOOK
Advertisement
Table of Contents
