鉂?/div>
Backward compatible to 66-MHz conventional
PCI
Compliance with PCI Local Bus Specification
rev 2.1
Compliance with ANSI draft T10/1365D
SCSI
Parallel Interface鈥?
(SPI-4)
SCSI features set: Supports packetized SCSI
protocol, and quick arbitration and select (QAS)
Supports Ultra320 (Fast-160) SCSI. Backward
compatible with Ultra160, Ultra2, and legacy SCSI
devices.
Compliance with
PCI Bus Power Management
Interface Specification
revision 1.0 (PC98)
Two concurrently operating wide, Ultra320 SCSI
channels
Up to 320 MB/sec parallel SCSI transfer rates per
channel
Supports single-ended and low voltage differential
(LVD) SCSI
SCSI initiator and target modes of operation
On-chip RISC processors (one for each channel) to
execute operations at the I/O control-block level
from the host memory
On-chip embedded synchronous RAMs to support
on-chip processors
Supports PCI dual-address cycle (64-bit
addressing)
No host intervention required to execute SCSI
operations from start to finish
Simultaneous, multiple logical threads
JTAG boundary scan support
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applications. This device interfaces the PCI bus to two
Ultra320 SCSI buses and contains an onboard RISC
processor. The product is a fully autonomous device,
capable of managing multiple I/O operations and
associated data transfers from start to finish without host
intervention. The ISP12320 provides power management
feature support in accordance with the
PCI Bus Power
Management Interface Specification.
The ISP12320 is
host-software compatible with the QLogic ISP12160A
chip.
ISP Initiator and Target Firmware
The ISP12320 firmware implements a cooperative,
multitasking host adapter that provides the host system
with complete SCSI command and data transport
capabilities, thus freeing the host system from the demands
of the SCSI bus protocol. The firmware provides two
interfaces to the host system: the command interface and
the SCSI transport interface. The single-threaded
command interface facilitates debugging, configuration,
and error recovery, while the multithreaded SCSI transport
interface maximizes use of the SCSI and host buses. The
ISP12320 can switch between initiator and target modes.
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Software Drivers
Software drivers are available for all major operating
systems. ISP12320 BIOS firmware is also available.
Subsystem Organization
To maximize I/O throughput and improve host and
SCSI bus utilization, the ISP12320 incorporates two
high-speed proprietary RISC processors; two intelligent
SCSI bus controllers (SCSI executive processors [SXPs]);
and a host bus, dual-channel DMA controller. The SCSI
bus controllers and the host bus DMA controller operate
independently and concurrently under the control of the
onboard RISC processors for maximum system
performance.
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Product Description
The ISP12320 supports dual channel, Ultra320
(Fast-160) SCSI functionality and is pin compatible with
QLogic鈥檚 ISP12160A dual SCSI processor. The product is
a single-chip, highly integrated bus master, dual-channel
SCSI I/O processor for SCSI initiator and target
83232-580-00 B
ISP12320
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