OXFORD, ENGLAND Oxford Semiconductor Ltd. is offering a native bridge chip for providing ATA/ATAPI (IDE) peripherals with Firewire (IEEE 1394-1995) connectivity.
With the integrated serial bus protocol (SBP-2), the device, designated the OXFW900, can use generic device drivers available in the Microsoft Windows and Apple MacOS operating systems. The part is thus suited for smart cable and tailgate interface applications in CD-ROM, CD-R, CD-RW, DVD and hard disk drives, according to Oxford.
The device yields a three-chip solution, requiring only an external 1394 PHY and ROM. A slow 32k x 8 external onetime-programmable or flash ROM is sufficient for most applications. For applications that need sustained data transfer rates in excess of 10 Mbytes/second, a 16-bit, 70-ns ROM is recommended.
The OXFW900 supports the standard IEEE 1394- 1995 PHY-LINK interface. Its sustained IDE data transfer rate is 25 Mbits/s, which Oxford said is faster than today's highest-performance disk drives demand. The 1394 transaction layer and SBP-2 protocol are implemented using a combination of the ARM7TDMI 32-bit RISC processor and an operational request block (ORB) hardware co-processor with a high-performance buffer manager.
The buffer manager has a RAM bandwidth of 800 Mbits/s. It provides automatic storage for 1394 and ATA/ATAPI packets and passes them to the appropriate destinations without intervention from the processor.
The OXFW900, in CMOS, comes in a 128-pin thin quad flat pack. It is unit-priced at $12 in quantities of 10,000 or more and is available in volume now.
CALL +44 1235 824900
EETInfo No. 613