usb detecting only high speed devices only - not detecting low speed devices

Hello all In a project Iam using 7448 powerpc processor . In that board iam using ISP 1562 philips PCI based usb controller. The problem iam facing is in Linux level the usb ports are detecting only ehci high speed devices(flash mem stick) But it is not detecting low speed

usb detecting only high speed devices only - not detecting low speed devices

Hello all In a project Iam using 7448 powerpc processor . In that board iam using ISP 1562 philips PCI based usb controller. The problem iam facing is in Linux level the usb ports are detecting only ehci high speed devices(flash mem stick) But it is not detecting low speed