XR17D158IV-F Datasheet, PDF (6/73 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART

XR17D158
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
PIN DESCRIPTIONS
xr
REV. 1.2.2
NAME
CD7#
RI7#
PIN #
50
51
TYPE
DESCRIPTION
I UART channel 7 Carrier Detect or general purpose input (active low).
I UART channel 7 Ring Indicator or general purpose input (active low).
ANCILLARY SIGNALS
MPIO0
108
MPIO1
107
MPIO2
74
MPIO3
73
MPIO4
68
MPIO5
67
MPIO6
66
MPIO7
65
EECK
116
EECS
115
EEDI
114
EEDO
113
XTAL1
110
XTAL2
109
TMRCK
69
ENIR
70
TEST#
VCC
111
64, 90,112
I/O Multi-purpose input/output 0. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT
I/O Multi-purpose input/output 1. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 2. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 3. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 4. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 5. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 6. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
I/O Multi-purpose input/output 7. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
O Serial clock to EEPROM. An internal clock of CLK divide by 256 is used for
reading the vendor and sub-vendor ID during power up or reset. However, it
can be manually clocked thru the Configuration Register REGB.
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 resistor for
external sensing of EEPROM during power up. See DAN112 for further
details.
O Write data to EEPROM device. It is manually accessible thru the Configura-
tion Register REGB.
I Read data from EEPROM device. It is manually accessible thru the Configu-
ration Register REGB.
I Crystal or external clock input.
O Crystal or buffered clock output.
I 16-bit timer/counter external clock input.
I Infrared mode enable (active high). This pin is sampled during power up, fol-
lowing a hardware reset (RST#) or soft-reset (register RESET). It can be
used to start up all 8 UARTs in the infrared mode. The sampled logic state is
transferred to MCR bit-6 in the UART.
I Factory Test. Connect to VCC for normal operation.
Power supply for the UART core logic - 5V ONLY. This power supply deter-
mines the VOH level of the non-PCI bus interface outputs. See Table 1 for
valid combinations of VCC and VIO that can be used for the XR17D158.
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