参数资料
型号: XR17V354IB-E8-EVB
厂商: Exar Corporation
文件页数: 33/66页
文件大小: 0K
描述: EVAL BRD FOR XR17V354-E8 176BGA
产品培训模块: PCIe UARTs
标准包装: 1
主要目的: 接口,UART
嵌入式:
已用 IC / 零件: XR17V354
已供物品:
其它名称: 1016-1613
XR17V354IB-E8-EVB-ND
XR17V354
39
REV. 1.0.3
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
3.4
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 a logic 1. All regular UART functions operate normally.
Figure 12 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 HIGH or mark condition while RTS# and DTR# are de-asserted. The CTS#,
DSR#, CD# and RI# inputs are ignored.
FIGURE 12. INTERNAL LOOP BACK
TX [3:0]
RX [3:0]
M
o
de
m
/
G
e
ne
ral
Pur
po
se
Co
nt
ro
l
L
ogic
In
ter
nal
Bu
s
Li
nes
an
d
Con
tr
o
lSig
na
ls
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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