The ISP1705 is a Hi-Speed Universal Serial Bus (USB) host and peripheral transceiver
that is fully compliant with Universal Serial Bus Specification Rev. 2.0 and UTMI+ Low
Pin Interface (ULPI) Specification Rev. 1.1. The ISP1705 is also an On-The-Go (OTG)
transceiver that is fully compliant with On-The-Go Supplement to the USB 2.0
Specification Rev. 1.3.
This transceiver supports high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed
(1.5 Mbit/s) data rates. The internal architecture of the ISP1705 is a highly optimized
ULPI-compliant interface operating at 60 MHz. The ISP1705 interfaces to USB ASIC,
FPGA or any system chip set through an 8-pin or 12-pin ULPI interface. All static UTMI
signals are accessed through the ULPI compliant register set. The ULPI interface
includes a 4-bit or 8-bit data bus, three control signals and a 60 MHz clock signal for
synchronization. The bidirectional data bus with control signals can synchronously
transmit and receive USB packets and access register data.