参数资料
型号: XR17D158CV-F
厂商: Exar Corporation
文件页数: 31/73页
文件大小: 0K
描述: IC UART PCI BUS OCTAL 144LQFP
产品培训模块: UART Product Overview
标准包装: 60
特点: *
通道数: 8
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
其它名称: 1016-1291
xr
XR17D158
REV. 1.2.2
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
37
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.
Figure 18 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.
FIGURE 18. INTERNAL LOOP BACK
TX [7:0]
RX [7:0]
Mode
m
/
Genera
lPurpo
se
Contro
l
Lo
gic
In
ter
n
al
B
u
sLines
an
d
C
ontr
o
lS
ignal
s
RTS# [7:0]
MCR bit-4=1
VCC
Transmit Shift
Register
Receive Shift
Register
CTS# [7:0]
DTR# [7:0]
DSR# [7:0]
RI# [7:0]
CD# [7:0]
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
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