High Performance UART
Description
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OX16C950 rev B High Performance UART with 128 byte FIFOs
FEATURES
• • • • • • • • • • • • • Single full-duplex asynchronous channel 128-byte deep transmitter / receiver FIFO Fully software compatible with industry standard 16C550 type UARTs Pin compatible with TL16C550B/C, ST16C650 and TL16C750 IBM PC/AT compatible Baud rates up to 15 Mbps in normal mode and 60Mbps in external 1x clock mode Readable FIFO levels Flexible clock prescaler from 1 to 31.
875 Isochronous mode using external 1x baud rate clock up to 60Mbps 9-bit data framing as well as 5,6,7 and 8 Detection of bad data in the receiver FIFO Automated in-band flow control using programmable Xon/Xoff characters Transmitter and receiver can be disabled • Automated out-of-band flow control using CTS# / RTS# and DSR# / DTR# • Readable in-band and out-of-band flow control status • Programmable special character detection • Arbitrary trigger levels for receiver and transmitter FIFO interrupts and automatic in-band and out-of-band flow control • Transmitter idle interrupt (shift register and FIFO both empty) • Optional Infra-red (IrDA) receiver and transmitter operation • RS-485 buffer enable signals • Software channel reset • Four byte device ID • Sleep mode (low operating current) • System clock up to 60 MHz (at 5V), 50 MHz at 3.
3V • 44 PLCC and 48 TQFP packages • 5 volts operation (PLCC), 3.
3/ 5V operation TQFP
REV B ENHANCEMENTS
The OX16C950B is an enhanced, fully backward-compatible revision of the OX16C950 rev A.
The chief enhancements are as follows – • All known errata fixed • Enhanced features first offered in OX16PCI954 added – these include controls for sleep-mode sensitivity, ability to read FCR and Good Data Status • 3V operation possible with 48 pin TQFP • Enhanced isochronous clocking options (optional inversions) • Enhanced system clock selection options (use of CLKSEL as a clock input) • Readable TxRdy, RxRdy status and forcing TxRdy or RxRdy inactive Hereafter OX16C950 rev B i...
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