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XR17C154IV Datasheet(PDF) 3 Page - Exar Corporation |
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XR17C154IV Datasheet(HTML) 3 Page - Exar Corporation |
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3 / 62 page  xr XR17C154 REV. 1.3.2 5V PCI BUS QUAD UART 3 PIN DESCRIPTIONS Pin Description NAME PIN # TYPE DESCRIPTION PCI LOCAL BUS INTERFACE RST# 134 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. CLK 135 I Bus clock input of up to 33.34MHz at 5V. AD31-AD25, AD24, AD23-AD16, AD15-AD8, AD7-AD0 138-144, 1, 6-13, 26-33, 37-44 IO Address data lines [31:0] (bidirectional). FRAME# 15 I Bus transaction cycle frame (active low). It indicates the beginning and dura- tion of an access. C/BE3#-C/BE0# 2, 14, 25, 36 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# 16 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# 17 O Target Ready (active low). STOP# 21 O Target request to stop current transaction (active low). 5 IDSEL 3 I Initialization device select (active high). DEVSEL# 18 O Device select to the XR17C154 (active low). INTA# 133 OD Device interrupt from XR17C154 (open drain, active low). PAR 24 IO Parity is even across AD[31:0] and C/BE[3:0]# (bidirectional, active high). PERR# 22 O Parity error indicator to host (active low). Optional in bus target application. SERR# 23 OD System error indicator to host (open drain, active low). Optional in bus target application. MODEM OR SERIAL I/O INTERFACE TX0 125 O UART channel 0 Transmit Data or infrared transmit data. Normal TXD output idles HIGH while infrared TXD output idles LOW. RX0 132 I UART channel 0 Receive Data or infrared receive data. Normal RXD input idles HIGH. The infrared pulses typically idle LOW but can be inverted inter- nally prior the decoder by FCTR[4]. RTS0# 127 O UART channel 0 Request to Send or general purpose output (active low). CTS0# 131 I UART channel 0 Clear to Send or general purpose input (active low). DTR0# 126 O UART channel 0 Data Terminal Ready or general purpose output (active low). DSR0# 130 I UART channel 0 Data Set Ready or general purpose input (active low). CD0# 129 I UART channel 0 Carrier Detect or general purpose input (active low). RI0# 128 I UART channel 0 Ring Indicator or general purpose input (active low). TX1 106 O UART channel 1 Transmit Data or infrared transmit data. Normal TXD output idles HIGH while infrared TXD output idles LOW. RX1 99 I UART channel 1 Receive Data or infrared receive data. Normal RXD input idles HIGH. The infrared pulses typically idle LOW but can be inverted inter- nally prior the decoder by FCTR[4]. RTS1# 104 O UART channel 1 Request to Send or general purpose output (active low). |
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