參數(shù)資料
型號: XR17C152CM-0A-EVB
廠商: Exar Corporation
文件頁數(shù): 25/62頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XR17C152 100TQFP
標準包裝: 1
系列: *
á
XR17C152
REV. 1.2.0
5V PCI BUS DUAL UART
31
4.6
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.
Figure 16 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, RTS# and DTR# pins are held HIGH (idle or de-asserted state), and the CTS#, DSR#
CD# and RI# inputs are ignored.
4.7
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.
FIGURE 16. INTERNAL LOOP BACK FUNCTION IN EACH UART CHANNEL
A11
A10
A9
UART CHANNEL
SELECTION
000
0
001
1
TX [1:0]
RX [1:0]
M
odem
/
Gener
al
P
u
rpos
e
Cont
ro
l
Logic
In
te
rn
al
Bus
L
ines
an
d
Co
nt
rol
Si
gn
al
s
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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