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XR17C152CM Datasheet(PDF) 3 Page - Exar Corporation |
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XR17C152CM Datasheet(HTML) 3 Page - Exar Corporation |
3 / 62 page áç áç áç áç XR17C152 REV. 1.2.0 5V PCI BUS DUAL UART 3 PIN DESCRIPTIONS Pin Description NAME PIN #TYPE DESCRIPTION PCI LOCAL BUS INTERFACE RST# 86 I Bus reset input (active low). It resets the PCI local bus configuration space registers, device configuration registers and UART channel registers to the default condition, see Table 19 on page 48. CLK 87 I Bus clock input of up to 33MHz at 5V. AD31-AD24, AD23-AD16, AD15-AD8, AD7-AD0 90-97, 2-9, 24-31, 35-42 I/O Address data lines [31:0] (bidirectional). FRAME# 13 I Bus transaction cycle frame (active low). It indicates the beginning and dura- tion of an access. C/BE3#-C/BE0# 98, 12, 21, 34 I Bus Command/Byte Enable [3:0] (active low). This line is multiplexed for bus Command during the address phase and Byte Enables during the data phase. IRDY# 14 I Initiator Ready (active low). During a write, it indicates that valid data is present on data bus. During a read, it indicates the master is ready to accept data. TRDY# 15 O Target Ready (active low). STOP# 17 O Target request to stop current transaction (active low). IDSEL 99 I Initialization device select (active high). DEVSEL# 16 O Device select to the XR17C152 (active low). INTA# 85 OD Device interrupt from XR17C152 (open drain, active low). PAR 20 I/O Parity is even across AD[31:0] and C/BE[3:0]# (bidirectional, active high). PERR# 18 O Data Parity error indicator, except for Special Cycle transactions (active low). Optional in bus target application. SERR# 19 OD System error indicator, Address parity or Data parity during Special Cycle transactions (open drain, active low). Optional in bus target application. MODEM OR SERIAL I/O INTERFACE TX0 73 O UART channel 0 Transmit Data or infrared transmit data. Normal TXD output idles HIGH while infrared TXD output idles LOW. RX0 66 I UART channel 0 Receive Data or infrared receive data. Normal RXD input idles HIGH while infrared RXD input idles LOW. 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, a LOW on the RXD input is considered a mark and if this bit is a logic 1, a HIGH on the RXD input is considered a space. RTS0# 71 O UART channel 0 Request to Send or general purpose output (active low). If this output is not used, leave it unconnected. CTS0# 67 I UART channel 0 Clear to Send or general purpose input (active low). This input should be connected to VCC when not used. DTR0# 72 O UART channel 0 Data Terminal Ready or general purpose output (active low). If this output is not used, leave it unconnected. 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. |
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