XR17V252 66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT JULY 2008 REV. 1.0.2 GENERAL DESCRIPTION Multi-port RS-232/RS-422/RS-485 Cards Point-of-Sale Systems 1 The XR17V252 (V252) is a single chip 2-channel 66MHz PCI UART (Universal Asynchronous Receiver FEATURES and Transmitter) solution, optimized for higher High performance 32-bit 66MHz PCI UART performance and lower power. The V252 device with its fifth generation register set is designed to meet the PCI 3.0 compliant high bandwidth and power management PCI power management rev. 1.1 compliant requirements for multi-serial communication ports for system administration and management. The 32-bit EEPROM interface for PCI configuration 66MHz PCI interface is compliant with PCI 3.0 and 3.3V supply with 5V tolerant non-PCI (serial) inputs PCI power management revision 1.1 specifications. The device provides an upgrade path for Exars Data read/write burst operation 33MHz 5V and Universal PCI UART family. Global interrupt register for both UART channels The V252 consists of two independent UART Up to 8 Mbps serial data rate channels, each with set of configuration and enhanced registers, 64 bytes of Transmit (TX) and Eight multi-purpose inputs/outputs Receive (RX) FIFOs, and a fractional Baud Rate A 16-bit general purpose timer/counter Generator (BRG). A global interrupt source register provides a complete interrupt status indication for Sleep mode with wake-up Indicator both channels to speed up interrupt parsing. The Two independent UART channels controlled with V252 device operates at 33/66MHz and features fully programmable TX and RX FIFO level triggers, 16C550 compatible register Set automatic hardware and software flow control, and 64-byte TX and RX FIFOs with level counters automatic RS-485 half duplex direction control output and programmable trigger levels for software and hardware design simplification. Fractional baud rate generator NOTE 1: Covered by U.S. Patents 5,649,122 and 5,949,787 Automatic RTS/CTS or DTR/DSR hardware flow control with programmable hysteresis APPLICATIONS Automatic Xon/Xoff software flow control Remote Access Servers RS-485 half duplex direction control output Storage Network Management with selectable turn-around delay Factory Automation and Process Control Infrared (IrDA 1.0) data encoder/decoder Instrumentation FIGURE 1. BLOCK DIAGRAM OF THE XR17V252 3.3 V VCC (5 V Tolerant Serial Inputs) CLK ( up to 66 MHz) RST UART Channel 0 AD 31:0 64 Byte TX FIFO TX0 , RX0 , DTR0 , UART C/BE 3:0 Regs DSR0 , RTS0 , IR TX & RX ENDEC CTS0 , CD0 , RI0 FRAME PCI Local IRDY BRG 64 Byte RX FIFO Device Bus TRDY Configuration Interface DEVSEL Registers UART Channel 1 STOP TX1 , RX1 , DTR1 , INTA 64 Byte TX FIFO UART IDSEL Regs DSR1 , RTS1 , IR TX & RX PERR ENDEC CTS1 , CD1 , RI1 SERR BRG 64 Byte RX FIFO PAR Configuration PME Space Registers EECK 16-bit Multi-purpose . MPIO0 - MPIO7 EEPROM EEDI Timer/Counter Inputs/ Outputs EEDO Interface EECS XTAL1 Crystal Osc / Buffer XTAL2 ENIR TMRCK EN485 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR17V252 66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT REV. 1.0.2 FIGURE 2. PIN OUT OF THE XR17V252 XTAL2 76 MPIO2 50 77 XTAL1 49 MPIO3 78 GND 48 MPIO4 PME 79 47 MPIO5 VCC 80 46 MPIO6 EEDO 81 MPIO7 45 EEDI 82 44 GND EECS 83 43 VCC EECK 84 42 AD0 INTA 85 41 AD1 RST 86 40 AD2 CLK 87 39 AD3 XR17V252 GND 88 38 AD4 VCC 89 37 AD5 100-TQFP AD31 90 36 AD6 AD30 (14x14x1.0mm) 91 35 AD7 AD29 92 34 C/BE0 AD28 93 GND 33 AD27 94 32 VCC AD26 95 31 AD8 AD25 96 AD9 30 AD24 97 29 AD10 C/BE3 98 28 AD11 IDSEL 99 AD12 27 VCC 100 26 AD13 ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR17V252IM 100-Lead TQFP -40C to +85C Active 2 GND 1 75 TMRCK AD23 2 74 ENIR AD22 3 73 TX0 AD21 4 72 DTR0 AD20 5 71 RTS0 6 AD19 70 RI0 AD18 7 69 CD0 AD17 8 68 DSR0 AD16 9 67 CTS0 VCC 10 66 RX0 GND 11 65 EN485 C/BE2 12 64 NC FRAME 13 63 NC IRDY 14 62 TX1 TRDY 15 61 DTR1 DEVSEL 16 60 RTS1 17 STOP 59 RI1 PERR 18 58 CD1 19 SERR 57 DSR1 20 PAR CTS1 56 C/BE1 21 RX1 55 VCC 22 54 VCC GND 23 53 GND 24 AD15 52 MPIO0 AD14 25 51 MPIO1