xr17v258 Exar Corporation, xr17v258 Datasheet - Page 36

• Manufacturer Part Number: xr17v258
• Description: 66mhz Pci Bus Octal Uart With Power Management Support
• Manufacturer: Exar Corporation

XR17V258
66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
The 8 sets of UART configuration registers are decoded using address lines A9 to A11 as shown below.
Address lines A0 to A3 select the 16 registers in each channel. The first 8 registers are 16550 compatible with
EXAR enhanced feature registers located on the upper 8 addresses.
4.5
UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING
F
IGURE
14. I
NTERNAL
L
OOP
A11
0
0
0
0
1
1
1
1
B
ACK
Transmit Shift
Receive Shift
A10
0
0
1
1
0
0
1
1
Register
Register
A9
36
0
1
0
1
0
1
0
1
DTR#
DSR#
RTS#
CTS#
CD#
RI#
MCR bit-4=1
UART C
OP1#
OP2#
S
VCC
VCC
ELECTION
VCC
0
1
2
3
4
5
6
7
HANNEL
RX [7:0]
TX [7:0]
RTS# [7:0]
CTS# [7:0]
DSR# [7:0]
DTR# [7:0]
RI# [7:0]
CD# [7:0]
xr
REV. 1.0.0