参数资料
型号: XR17D154IV
厂商: Exar Corporation
文件页数: 28/69页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
产品变化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
XR17D154
xr
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. 1.2.2
34
5.6
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.
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.
5.7
UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING
The 4 sets of UART configuration registers are decoded using address lines A9 to A11 as shown below:
FIGURE 18. INTERNAL LOOP BACK
A11
A10
A9
UART CHANNEL
SELECTION
0
1
0
1
0
2
0
1
3
TX[3:0]
RX [3:0]
Modem
/G
ener
al
P
ur
pos
e
C
ont
ro
l
Lo
gi
c
In
te
rn
al
B
u
sLi
ne
sa
nd
C
ontr
o
lS
igna
ls
RTS# [3:0]
MC R bit-4=1
VCC
TransmitShif t
Register
ReceiveShif t
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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