參數(shù)資料
型號(hào)： XR17L152
廠商： Exar Corporation
英文描述： 3.3V PCI BUS DUAL UART
中文描述： 3.3V的PCI總線雙UART
文件頁數(shù)： 25/55頁
文件大小： 318K
代理商： XR17L152
XR17L152
3.3V PCI BUS DUAL UART
REV. 1.1.0
á
DISCONTINUED
25
4.4
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 11
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 logic 1 or mark condition while RTS# and DTR# are de-asserted, and
CTS#, DSR# CD# and RI# inputs are ignored.
Internal Loopback
4.5
The 2 sets of UART configuration registers are decoded using address lines A9 to A11 as shown below.
UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING.
F
IGURE
11. I
NTERNAL
L
OOP
B
ACK
F
UNCTION
IN
EACH
UART C
HANNEL
A11
A10
A9
UART
C
HANNEL
S
ELECTION
0
0
0
0
0
0
1
1
TX [1:0]
RX [1:0]
M
L
I
RTS# [1:0]
MCR bit-4=1
VCC
VCC
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17L152CM 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS DUAL UART
XR17L152IM 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS DUAL UART
XR17L154 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS QUAD UART
XR17L154CV 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm
XR17L154IV 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS QUAD UART
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