REV. 1.0.2 2.19 Internal Loopback The V2651 UART prov" />
參數(shù)資料
型號: XR16V2651IM-0B-EB
廠商: Exar Corporation
文件頁數(shù): 15/51頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR V2651 48TQFP
標準包裝: 1
系列: *
XR16V2651
22
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.2
2.19
Internal Loopback
The V2651 UART provides an internal loopback capability for system diagnostic purposes. The internal
loopback mode is enabled by setting MCR register bit-4 to 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, RTS# and DTR# pins are held while the CTS#, DSR# CD# and RI# inputs are ignored.
Caution: the RX input pin must be held HIGH during loopback test else upon exiting the loopback test the
UART may detect and report a false “break” signal. Also, Auto RTS/CTS flow control is not supported during
internal loopback.
FIGURE 12. INTERNAL LOOP BACK IN CHANNEL A AND B
TXA/TXB
RXA/RXB
M
o
dem
/
G
e
neral
Purpo
se
Cont
ro
lL
ogic
In
te
rn
al
Dat
aBu
sL
in
es
a
n
d
Co
n
tro
lS
ign
a
ls
RTSA#/RTSB#
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTSA#/CTSB#
DTRA#/DTRB#
DSRA#/DSRB#
RIA#/RIB#
CDA#/CDB#
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
OP2A#/OP2B#
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