OXAN1

www.DataSheet4U.com Customer perception of performance in IEEE 1394 Applications Contents Introduction Description Optimisation of OXFW911 Graphs of OXFW911 performance Optimal Performance Conclusion Application Note OXAN 1 Oxford Semiconductor has designed the OXFW911 IEEE 1394 to IDE bridge with improved performance in mind. They have integrated the 16-bit flash memory onto the device to minimise the wait states incurred in accessing the flash. They have also optimised the interaction of the ARM7-TDMI based hardware and the firmware to reduce the relative time spent on the SBP-2 protocol conversion. Introduction This application note details the parameters important for customer perception of performance in IEEE 1394 applications. Much attention is given to the maximum performance of any given system. However, in the majority of applications small data block sizes are used and maximum performance will not be achieved. Graphs of OXFW911 Performance Figure 1 details the performance of the OXFW911 with various block sizes versus the same drive placed on the internal IDE bus. So far these figures for the OXFW911 have been limited by the speed of the drive used for testing, and the bus. These figures will be updated once faster drives are available. The tests were carried out on a NEC DTLA-307020 20.5GB hard disk using 15-11-2000 firmware. The tests were carried out on a Windows 2000 system using YAPT. The Host was a Dell PIII 800 with 128M RAM. Description In ...