REV. 1.3.2 32 4.6 Internal Loopback Each UART channel provides an internal loopback capability f" />
參數(shù)資料
型號(hào)： XR17C154CV-0A-EVB
廠商： Exar Corporation
文件頁(yè)數(shù)： 26/62頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17C154-A 144TQF
標(biāo)準(zhǔn)包裝： 1
系列： *
XR17C154
xr
5V PCI BUS QUAD UART
REV. 1.3.2
32
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 4 sets of UART configuration registers are decoded using address lines A8 to A11 as show below. Ad-
dress 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 16. INTERNAL LOOP BACK
A11
A10
A9
A8
UART CHANNEL
SELECTION
0
1
0
1
0
1
0
2
0
1
0
3
TX [3:0]
RX [3:0]
Mod
em
/
General
Pu
rp
os
e
Control
Logic
In
tern
al
Bu
s
L
in
es
an
d
Co
n
tro
lSig
n
als
RTS# [3:0]
MCR bit-4=1
VCC
Transmit Shift
Register
Receive Shift
Register
CTS# [3:0]
DTR# [3:0]
DSR# [3:0]
RI# [3:0]
CD# [3:0]
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
XR17C154CV-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C154CVTR-F 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C154CVTR-F
XR17C154IV 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C154IV-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C154IVTR-F 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C154IVTR-F
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