OXFW900

Features:

·  S400 compliant 1394-1995 Link and Transaction layers
·  Compatible with 1394-1995 and 1394A Phys.
·  Buffer Manager with max. RAM bandwidth of 800Mbps
·  Microsoft Win98-Second Edition, Win2000 and Apple MacOS 8.5 generic driver support
·  SBP-2 Target Revision 4 compliant interface
·  Fully ATA-4 compliant (see T13-1153D)
·  Sustained IDE transfer rate of 25 Mbytes per second, Peak transfer rate of 50Mbytes per second.
·  Supports PIO modes 0 to 4, DMA modes 0 to 2 and Ultra DMA modes 0 to 2
·  Integrated 32-bit RISC processor (ARM7TDMI) with on-chip scratch RAM
·  ORB co-processor to accelerate translation of ORBs to ATAPI commands
·  Supports ORB chaining for increased performance
·  High performance ATA command translation in firmware using Reduced Block Command (RBC) set
·  Optional External Serial ROM interface for configuration data, user serial number, etc.
·  Blank Flash memory programming feature via 1394 bus
·  3.3 Volts operation
·  Low Power CMOS
·  Firmware and Flash Programming Utilities supplied by Oxford Semiconductor
·  ultra-thin 128-TQFP package (14mm x 14mm x 1mm )


Pinout




Specifications

Symbol	Parameter	Min	Max	Units
VDD	DC supply voltage	3.0	3.6	V
VBB	5V PMOS bulk bias	4.75	5.25	V
TC	Temperature	0	70

Description

The OXFW900 is a high-performance 1394 to ATA/ATAPI (IDE) native bridge with an integrated target Serial Bus Protocol (SBP-2 ) controller. By supporting the SBP-2 protocol, the device can use generic SBP-2 drivers available in the Microsoft Windows 98SE, Microsoft Windows 2000, Microsoft Millennium and Apple MacOS operating systems.

The OXFW900 is ideally suited for smart-cable or tailgate interface applications for removable-media drives, compact flash card readers, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM and hard disk drives, allowing IDE drives to be connected to a 1394 serial bus in a plug-and-play fashion.

Both ATA and ATAPI devices of OXFW900 are supported using the same firmware.

This highly integrated device OXFW900 offers a three-chip solution to native bridge applications using an external 1394 PHY and Flash ROM. A slow 32Kx8 Flash ROM (up to 120ns) is sufficient for most optical media applications. For applications that need a sustained data rate in excess of 10Mbytes per second, for example high performance disk drives, an 8-bit 50ns FLASH or faster is recommended.

The OXFW900 is compatible with both 1394-1995 and 1394A PHYs.

The LINK controller of OXFW900 complies with S400 1394-1995 specification. The 1394 transaction layer and SBP-2 protocol is implemented using a combination of the ARM7TDMI (low-power 32-bit RISC processor), an ORB (Operational Request Block) hardware co-processor and a high performance buffer manager.

The Buffer Manager of OXFW900 has a RAM bandwidth of 800Mbps. It provides storage for 1394 and ATA/ATAPI packets, automatically storing them and passing them to the appropriate destinations, without any intervention from the processor. OXFW900 also provides storage and manages the sequencing of ORB fetching to reduce latency and improve data throughput.

The configuration data of OXFW900 including the IEEE OUI (Organisational Unique Identifier) and device serial number is stored in the Flash ROM which may be uploaded from the 1394 bus, even when blank. The device also facilitates firmware uploads from the 1394 bus.

The ORB co-processor of OXFW900 translates ORBs as defined in the SBP-2 protocol into ATA/ATAPI commands, and automatically stores error/status messages at an address specified by the host.

Concurrent operation of the ATA/ATAPI and 1394 interfaces of OXFW900 are facilitated using the high throughput Buffer Manager where LINK, ATAPI manager and ARM7TDMI can perform interleaved accesses to the on-chip RAM buffer. The high performance processor ensures that no significant latency is incurred. The ATA command translation is performed in firmware to meet RBC (Reduced Block Commands) standard, T10-1228D. The ATA/ATAPI Manager supports PIO modes 0 to 4, DMA modes 0 to 2 and Ultra DMA mode 0 to 2 and provides the interface to the IDE bus. It is compliant with T13-1153D, ATA-4 specification.