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XR17V252 Datasheet(PDF) 5 Page - Exar Corporation |
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XR17V252 Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 69 page  XR17V252 5 REV. 1.0.1 66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT NOTE: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. ENIR 74 I Global Infrared mode enable (active high). This pin is sampled during power up, following a hardware reset (RST#) or soft-reset (register RESET). It can be used to start up both UARTs in the infrared mode. The sampled logic state is transferred to MCR bit-6 in the UART. Software can override this pin there- after and enable or disable it. EN485# 65 I Global AutoRS485 half-duplex direction control enable (active low). During power up or reset, this pin is sampled and if it is a logic high, both UARTs are set for Auto RS485 Mode. Also, the Auto RS485 bit, FCTR[5], is set in both channels. Software can override this pin thereafter and enable or disable it. PME# 79 OD Power Management Event signal. While in D3hot state, if the PME_Enable bit in the Power Management Control/Status Register is set, the V252 asserts the PME# upon receiving a new character or upon change of state of modem inputs on any channel. VCC 54, 80, 10, 22, 32, 43, 89, 100 PWR Power supply for the UART core logic and PCI bus I/O - 3.3V only. The V252 is PCI 3.0 signalling compliant at 3.3V operation. The non-PCI inputs (except XTAL1) are 5V tolerant. This includes all the serial (modem) inputs. GND 1, 11, 23, 33, 44, 53, 78, 88 PWR Power supply common, ground. NC 63, 64 No Connection. PIN DESCRIPTIONS NAME PIN #TYPE DESCRIPTION |
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