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ISP2312 Data Sheet
Dual 2-Gb Fibre Channel to 133-MHz PCI-X Controller
The ISP2312 is a highly integrated single-chip, dual-channel, bus master, Fibre Channel processor that targets storage, clustering, and networking applications. This chip connects a conventional PCI bus or PCI-X bus to a 2-Gb Fibre Channel loop or to a point-to-point Fibre Channel port. The ISP2312 is a fully autonomous device, capable of managing multiple I/O operations and associated data transfers from start to finish without host intervention. The ISP2312 balances the advanced bus speeds and efficiency of PCI-X with exceptional 2-Gb Fibre Channel performance. Fibre Channel support for SCSI, IP, and VI allows the ISP2312 to target a wide spectrum of storage and system area networks (SANs).
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Features
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66/133-MHz, 64-bit, true multifunction PCI-X host bus interface Backward compatible to standard 33/66-MHz PCI 5-V tolerant PCI interface Compliance with PCI Local Bus Specification revision 2.2 and PCI-X Specification revision 1.0a Supports Fibre Channel-arbitrated loop (FC-AL), FC-AL-2, point-to-point, and switched fabric topologies Supports full-duplex communications in all Fibre Channel topologies Supports Fibre Channel protocol-SCSI (FCP-SCSI), Fibre Channel Internet protocol (IP), and Fibre Channel-virtual interface (FC-VI) protocol
Compliance with PCI Bus Power Management Interface Specification Revision 1.1 (PC99) Compliance with ANSI SCSI standards for class 1, class 2, class 3, and intermix Fibre Channel service: Second Generation FC Generic Services Definition (FC-GS-2), NCITS 288.200x, Project 1134-D, revision 5.3 Third Generation FC Generic Services Definition (FC-GS-3) draft, revision 6.2 Fibre Channel-Physical and Signaling Interface (FC-PH), X2.230:1994 SCSI-3 Fibre Channel Protocol (SCSI-FCP), X3.269:1996 Fibre Channel-Arbitrated Loop-2 (FC-AL-2), Project 1133-D, revision 6.5 Fibre Channel-Private Loop Direct Attach Technical Report (FC-PLDA), NCITS/TR-19:1998 SCSI-3 Architecture Model (SAM), X3T10/994D/Rev 18 SCSI-3 Controller Command Set, X3T10/Project 1047D/Rev 6c Two concurrently operating 2 Gbps capable Fibre Channel nodes Supports up to 400 MBps sustained Fibre Channel data transfer rate Supports SCSI initiator, initiator/target, and target modes Onboard, enhanced RISC processor Onboard 2-Gb serial transceivers Automatically negotiates the Fibre Channel bit rate (1 or 2 Gb) Supports PCI dual-address cycle and cache commands
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No host intervention required to execute complete SCSI, IP, or VI operations Supports multi-ID aliasing in target mode Supports JTAG boundary scan, full scan, and memory built-in self-test (BIST)
Fibre Channel protocol modules (FPMs); integrated frame buffer memory; and a PCI bus, 10-channel, bus master DMA controller. The FPMs and PCI bus DMA controller operate independently and concurrently under the control of the onboard RISC processors for maximum system performance. The complete I/O subsystem solution using the ISP2312 and directly connected hard drives is shown in figure 1.
Subsystem Organization
To maximize I/O throughput and improve host and Fibre Channel utilization, the ISP2312 incorporates two high-speed, proprietary RISC processors; two
STORAGE SUBSYSTEM SERVER EXTERNAL CODE/DATA MEMORY 16 TAPE LIBRARY RISC 64-BIT PCI 1056 MBps P C I RESPONSE QUEUE B U S PCI INTERFACE 64-BIT, 66/133 MHz PCI/PCI-X FRAME BUFFER FRAME BUFFER FIBRE CHANNEL INTERFACE 400 MBps (2 Gbps) FIBRE CHANNEL STORAGE AREA NETWORK (SAN) TAPE LIBRARY 16 EXTERNAL CODE/DATA MEMORY SERVER FIBRE CHANNEL INTERFACE 400 MBps (2 Gbps) FIBRE CHANNEL STORAGE AREA NETWORK (SAN)
HOST MEMORY HOST SOFTWARE DRIVER IOCBs REQUEST QUEUE
ISP2312
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STORAGE SUBSYSTEM
Figure 1. I/O Subsystem Design Using the ISP2312
PCI-X Interface
The ISP2312 PCI-X interface has the following features:
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66- or 133-MHz, 64-bit, true multifunction, intelligent bus master PCI-X interface 33-MHz and 66-MHz 64-bit intelligent bus master conventional PCI interface (PCI 2.2) 64-bit host memory addressing (dual-address cycle) 10-channel DMA controller 32-bit PCI target mode for communication with the host Pipelined DMA registers for efficient scatter/gather operations
32-bit DMA transfer counter to support large I/O transfer lengths Support for PCI-X split transactions Support for PCI power management Support for the message signaled interrupt function Support for flash BIOS PROM Support for subsystem ID 3.3-V and 5.0-V tolerant PCI-X I/O buffers
The ISP2312 is designed to interface directly to the PCI or PCI-X bus and operate as a 64-bit DMA bus master. This function is accomplished through a PCI bus interface unit (PBIU) containing an onboard DMA controller. The PBIU generates and samples PCI control signals, generates host memory
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addresses, and facilitates the transfer of data between host memory and the onboard frame buffer. It also allows the host to access the ISP2312 internal registers and communicate with the onboard RISC processors. The ISP2312 onboard DMA controller consists of 10 independent DMA channels that initiate transactions on the PCI bus and transfer data between the host memory and frame buffer or the RISC RAM. The PBIU internally arbitrates between the DMA channels and alternately services them. Each DMA channel has a set of DMA registers that are programmed for transfers by the RISC processors.
RISC Processors
The ISP2312 RISC processors have the following features:
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Execution of multiple I/O control blocks from the host memory Reduced host intervention and interrupt overhead One interrupt or less per I/O operation
Fibre Channel Interface
The ISP2312 provides two onboard 2-Gb transceivers for direct connection to the Fibre Channel ports on copper media.
One of the major features of the ISP2312 is its ability to handle complete I/O transactions from start to finish with no host intervention. This high level of integration is accomplished with the onboard RISC processors. The ISP2312 RISC processors control the chip interfaces; execute simultaneous, multiple IOCBs; and maintain the required thread information for each transfer.
Multiprotocol Support
The ISP2312 firmware implements a multitasking host adapter that provides the host system with IP communications, complete SCSI command and data transport capabilities, and VI communications, thus freeing the host system from simultaneous execution of SCSI, IP, and VI traffic. The firmware provides two interfaces to the host system: the command interface and the Fibre Channel transport interface. The single-threaded command interface facilitates debugging, configuration, and error recovery. The multithreaded transport interface maximizes use of the Fibre Channel and host buses. The ISP2312 can operate simultaneously in SCSI initiator and target modes, and supports SCSI, IP, and VI protocols concurrently.
Fibre Channel Protocol Modules
The ISP2312 FPMs have the following features:
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Support for one Fibre Channel port Support for 1- and 2-Gb serial interfaces Auto-negotiation to support 1-Gb or 2-Gb devices Full-duplex data transfer rate up to 400 MBps Integrated frame buffer that supports up to a 2112-byte frame payload 8B/10B encoder and decoder with clock skew management
Each FPM transmits and receives data at the full Fibre Channel rate of 106.25 or 212.50 MBps. The on-chip frame buffer includes separate areas for received data and transmit data, as well as areas for managing special frames such as command and response. Each FPM receive path validates and routes frames received from the Fibre Channel to the appropriate area in the frame buffer. The transmit path transmits frames from the frame buffer to the Fibre Channel. Each FPM automatically handles frame delimiters and frame control.
Software Drivers
The ISP2312 supports a host software interface similar to the QLogic parallel SCSI and single channel Fibre Channel processor families. Existing ISP2300 software drivers for all major operating systems are easily modified to support the ISP2312. The ISP2312 also supports FCP-SCSI, IP, and VI software drivers for most major operating systems.
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Packaging
The ISP2312 is available in a 388-pin thermally enhanced plastic ball grid array (EPBGA-T) package. The ISP2312 power supply voltages are 2.5 and 3.3, with I/O voltages up to 5.
Specifications are subject to change without notice.
QLogic Corporation, 26600 Laguna Hills Drive, Aliso Viejo, CA 92656, (800) 867-7274 or (949) 389-6000 March 19, 2002
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