参数资料
型号: XR17V252IM-0A-EVB
厂商: Exar Corporation
文件页数: 27/69页
文件大小: 0K
描述: EVAL BOARD FOR XR17V252 100TQFP
标准包装: 1
系列: *
XR17V252
33
REV. 1.0.2
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
4.4
Internal Loopback
Each UART channel provides an internal loopback capability for system diagnostic. The internal loopback
mode is enabled by setting MCR register bit [4] to logic 1. All regular UART functions operate normally.
shows how the modem port signals are re-configured. Transmit data from the transmit shift register
output is internally routed to the receive shift register input allowing the system to receive the same data that it
was sending. The TX pin is held at HIGH or mark condition while RTS# and DTR# are de-asserted, and CTS#,
DSR# CD# and RI# inputs are ignored.
4.5
UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING
The 2 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.
FIGURE 14. INTERNAL LOOP BACK
A11
A10
A9
UART CHANNEL
SELECTION
0
1
TX [1:0]
RX [1:0]
Mo
de
m
/
G
e
ne
ra
lPur
p
o
s
e
C
o
nt
ro
l
Lo
gi
c
In
te
rn
al
Bus
Line
s
and
Control
Si
gna
ls
RTS# [1:0]
MCR bit-4=1
VCC
Transmit Shift
Register
Receive Shift
Register
CTS# [1:0]
DTR# [1:0]
DSR# [1:0]
RI# [1:0]
CD# [1:0]
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
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