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Part: OX16C950B
Category:
Communication
-> UARTs
Description: Intelligent Single Channel Uart
Company: Oxford Micro Devices, Inc.
Datasheet: Download OX16C950B datasheet File size : 827 kB
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Datasheet text preview:
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 is simply referred to as OX16C950.
Oxford Semiconductor Ltd. 25 Milton Park, Abingdon, Oxon, OX14 4SH, UK Tel: +44 (0)1235 824900 Fax: +44 (0)1235 821141
Oxford Semiconductor 2001 OX16C950 rev B Datasheet R1.2 May 2001 Part No. OX16C950-PCC60-B
DESCRIPTION
The OX16C950 is a single-channel ultra-high performance UART offering data rates up to 15Mbps and 128-deep transmitter and receiver FIFOs. Deep FIFOs reduce CPU overhead and allow utilisation of higher data rates. It is software compatible with the widely used industrystandard 16C550 type devices and compatibles, as well as other OX16C95x family devices. It is pin-compatible with the TL16C550, ST16C650 devices. In addition to increased performance and FIFO size, the OX16C950 also provides enhanced features including improved flow control. Automated software flow control using Xon/Xoff and automated hardware flow control using CTS#/RTS# and DSR#/DTR# prevent FIFO over-run. Flow control and interrupt thresholds are fully programmable and readable, enabling programmers to fine-tune the performance of their system. FIFO levels are readable to facilitate fast driver applications. The addition of software reset enables recovery from unforeseen error condition allowing drivers to restart gracefully. The OX16C950 supports 9-bit data frames used in multi-drop industrial protocols. It also offers multiple external clock options for isochronous applications, e.g. ISDN, xDSL. The OX16C950 is ideally suited to PC applications, such as high-speed COM port add-in cards which enable PC users to take advantage of the maximum performance of analogue modems or ISDN terminal adapters. It is also suitable for any equipment requiring high speed RS232/RS422/RS485 interfaces. Fabricated in 0.6µm process, OX16C950 also has a low operating current and sleep mode for battery powered applications.
Oxford Semiconductor Ltd. 25 Milton Park, Abingdon, Oxon, OX14 4SH, UK Tel: +44 (0)1235 824900 Fax: +44 (0)1235 821141
Oxford Semiconductor 2001 OX16C950 rev B Datasheet R1.2 May 2001 Part No. OX16C950-PCC60-B
OXFORD SEMICONDUCTOR LTD.
OX16C950 rev B
CONTENTS
FEATURES...... 1 REV B ENHANCEMENTS....... 1 DESCRIPTION ...... 2 CONTENTS ..... 3 1 PERFORMANCE COMPARISON .... 5 2 BLOCK DIAGRAM ............ 6 3 PIN INFORMATION........... 7 4 PIN DESCRIPTIONS ......... 8 4.1 FURTHER PIN INFORMATION ....... 11 5 MODE SELECTION......... 13 5.1 450 MODE......... 13 5.2 550 MODE......... 13 5.3 EXTENDED 550 MODE....... 13 5.4 750 MODE......... 13 5.5 650 MODE......... 13 5.6 950 MODE......... 14 6 REGISTER DESCRIPTION TABLES...... 15 7 RESET CONFIGURATION............. 19 7.1 HARDWARE RESET...... 19 7.2 SOFTWARE RESET ...... 19 8 TRANSMITTER & RECEIVER FIFOS..... 20 8.1 FIFO CONTROL REGISTER `FCR' ........ 20 9 LINE CONTROL & STATUS .......... 21 9.1 FALSE START BIT DETECTION..... 21 9.2 LINE CONTROL REGISTER `LCR' .......... 21 9.3 LINE STATUS REGISTER `LSR'.... 22 10 INTERRUPTS & SLEEP MODE..... 23 10.1 INTERRUPT ENABLE REGISTER `IER' .... 23 10.2 INTERRUPT STATUS REGISTER `ISR' .... 24 10.3 INTERRUPT DESCRIPTION ........... 24 10.4 SLEEP MODE ..... 25 11 MODEM INTERFACE...... 25 11.1 MODEM CONTROL REGISTER `MCR' .... 25 11.2 MODEM STATUS REGISTER `MSR' ....... 26 12 OTHER STANDARD REGISTERS ......... 27 12.1 DIVISOR LATCH REGISTERS `DLL & DLM'........... 27 12.2 SCRATCH PAD REGISTER `SPR' .......... 27 13 AUTOMATIC FLOW CONTROL .... 28 13.1 ENHANCED FEATURES REGISTER `EFR'.............. 28 13.2 SPECIAL CHARACTER DETECTION ........ 29 13.3 AUTOMATIC IN-BAND FLOW CONTROL .. 29 13.4 AUTOMATIC OUT-OF-BAND FLOW CONTROL......... 29 14 BAUD RATE GENERATION.......... 30 14.1 GENERAL OPERATION ....... 30 14.2 CLOCK PRESCALER REGISTER `CPR'... 31 14.3 TIMES CLOCK REGISTER `TCR'............ 31 14
.4 INPUT CLOCK OPTIONS .............. 33 14.5 TTL CLOCK MODULE ........ 33 Data Sheet Revision 1.2 Page 3
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