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XR17V254 Datasheet(PDF) 1 Page - Exar Corporation |
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XR17V254 Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 70 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XR17V254 66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT FEBRUARY 2007 REV. 1.0.0 GENERAL DESCRIPTION The XR17V2541 (V254) is a single chip 4-channel 66MHz PCI (Peripheral Component Interconnect) UART (Universal Asynchronous Receiver and Transmitter) solution, optimized for higher performance and lower power. The V254 device with its fifth generation register set is designed to meet the high bandwidth and power management requirements for multi-serial communication ports for system administration and management. The 32-bit 66MHz PCI interface is compliant with PCI 3.0 and PCI power management revision 1.1 specifications. The device provides an upgrade path for Exar’s 33MHz 5V and Universal PCI UART family of products in a 144-pin LQFP package. The V254 consists of four independent UART channels, each with set of configuration and enhanced registers, 64 bytes of Transmit (TX) and Receive (RX) FIFOs, and a fractional Baud Rate Generator (BRG). A global interrupt source register provides a complete interrupt status indication for all 4 channels to speed up interrupt parsing. The V254 device operates at 33/66MHz and features fully programmable TX and RX FIFO level triggers, automatic hardware and software flow control, and automatic RS-485 half duplex direction control output for software and hardware design simplification. NOTE 1: Covered by U.S. Patents #5,649,122 and #5,949,787 APPLICATIONS • Remote Access Servers • Storage Network Management • Factory Automation and Process Control • Instrumentation • Multi-port RS-232/RS-422/RS-485 Cards • Point-Of-Sales FEATURES • High performance 32-bit 66MHz PCI UART • PCI 3.0 compliance • PCI power management rev. 1.1 compliance • EEPROM interface for PCI configuration • 3.3V supply with 5V tolerant non-PCI (serial) inputs • Data read/write burst operation • Global interrupt register for all four UART channels • Up to 8 Mbps serial data rate • Eight multi-purpose inputs/outputs • A 16-bit general purpose timer/counter • Sleep mode with wake-up Indicator • Four independent UART channels controlled with ■ 16C550 compatible register Set ■ 64-byte TX and RX FIFOs with level counters and programmable trigger levels ■ Fractional baud rate generator ■ Automatic RTS/CTS or DTR/DSR hardware flow control with programmable hysteresis ■ Automatic Xon/Xoff software flow control ■ RS-485 half duplex direction control output with selectable turn-around delay ■ Infrared (IrDA 1.0) data encoder/decoder FIGURE 1. BLOCK DIAGRAM OF THE XR17V254 TMRCK Device Configuration Registers XTAL1 XTAL2 Crystal Osc/Buffer UART Channel 0 TX0, RX0, DTR0#, DSR0#, RTS0#, CTS0#, CD0#, RI0# PCI Local Bus Interface CLK (upto 66MHz) RST# AD[31:0] C/BE[3:0]# PAR FRAME# IRDY# TRDY# DEVSEL# STOP# IDSEL PERR# SERR# Configuration Space Registers . MPIO0- MPIO7 Multi-purpose Inputs/Outputs TX3, RX3, DTR3#, DSR3#, RTS3#, CTS3#, CD3#, RI3# UART Channel 3 UART Channel 2 UART Channel 1 16-bit Timer/Counter EECK EEDI EEDO EECS EEPROM Interface 64 Byte TX FIFO 64 Byte RX FIFO BRG IR ENDEC TX & RX UART Regs 3.3V VCC (5V Tolerant Serial Inputs) INTA# PME# GND |
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Similar Description - XR17V254 |
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