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XR17L152CM Datasheet(PDF) 4 Page - Exar Corporation |
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XR17L152CM Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 55 page  áç áç áç áç XR17L152 3.3V PCI BUS DUAL UART DISCONTINUED REV. 1.1.0 4 DSR0# 68 I UART channel 0 Data Set Ready or general purpose input (active low). This input should be connected to VCC when not used. CD0# 69 I UART channel 0 Carrier Detect or general purpose input (active low). This input should be connected to VCC when not used. RI0# 70 I UART channel 0 Ring Indicator or general purpose input (active low). This input should be connected to VCC when not used. TX1 62 O UART channel 1 Transmit Data or infrared transmit data. Normal TXD output idles at logic 1 condition while infrared TXD output idles at a logic 0 condition. RX1 55 I UART channel 1 Receive Data or infrared receive data. Normal RXD input idles at logic 1 condition while infrared RXD input idles at a logic 0 condition. In the infrared mode, the polarity of the incoming RXD signal can be selected via FCTR bit-4. If this bit is a logic 0, logic 0 on the RXD input is considered a mark and if this bit is a logic 1, a logic 0 on the RXD input is considered a space. RTS1# 60 O UART channel 1 Request to Send or general purpose output (active low). If this output is not used, leave it unconnected. CTS1# 56 I UART channel 1 Clear to Send or general purpose input (active low). This input should be connected to VCC when not used. DTR1# 61 O UART channel 1 Data Terminal Ready or general purpose output (active low). If this output is not used, leave it unconnected. DSR1# 57 I UART channel 1 Data Set Ready or general purpose input (active low). This input should be connected to VCC when not used. CD1# 58 I UART channel 1 Carrier Detect or general purpose input (active low). This input should be connected to VCC when not used. RI1# 59 I UART channel 1 Ring Indicator or general purpose input (active low). This input should be connected to VCC when not used. ANCILLARY SIGNALS MPIO0-MPIO7 52-45 I/O Multi-purpose inputs/outputs 0-7. The function of these pin are defined thru the Configuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT EECK 84 O Serial clock to EEPROM. Pin has a weak internal pull-down resistor and requires an external 10K resistor to operate correctly with the EEPROM. An internal clock of CLK divide by 256 is used for reading the vendor and sub- vendor ID and model number during power up or reset. However, it can be manually clocked thru the Configuration Register REGB. EECS 83 O Chip select to a EEPROM device like 93C46. It is manually selectable thru the Configuration Register REGB. Requires a pull-up 4.7K ohm resister for exter- nal sensing of EEPROM during power up. See DAN112 for further details. EEDI 82 O Write data to EEPROM device. It is manually accessible thru the Configura- tion Register REGB. The L152 auto-configuration register interface logic uses the 16-bit format. EEDO 81 I Read data from EEPROM device. It is manually accessible thru the Configu- ration Register REGB. PIN DESCRIPTIONS NAME PIN #TYPE DESCRIPTION |
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