User Guide
Table Of Contents
11
5 – Port Description
Table 5-1 • Port Description
Port Name Port Group Direction Description
TXD MMUART_<n>_PADS
MMUART_<n>_FABRIC
Out Serial output data in Full Duplex mode.
This is the data that will be transmitted from
Core16550. It is synchronized with the BAUDOUT
output pin.
RXD MMUART_<n>_PADS
MMUART_<n>_FABRIC
In Serial Input Data in Full Duplex mode.
This is the data that will be transmitted into
Core16550. It is synchronized with the PCLK input
pin.
TXD_RXD MMUART_<n>_PADS
MMUART_<n>_FABRIC
Inout Serial output and input data in Half Duplex mode.
CLK MMUART_<n>_CLK
MMUART_<n>_FABRIC_CLK
Inout Clock in synchronous mode.
RTS MMUART_<n>_MODEM_PADS
MMUART_<n>_FABRIC_MODEM
Out Request to Send.
This active high output signal is used to inform the
attached device (modem) that Core16550 is ready to
send data. It is programmed by the CPU via the
Modem Control Register.
DTR MMUART_<n>_PADS_MODEM
MMUART_<n>_FABRIC_MODEM
Out Data Terminal Ready.
This active high output signal informs the attached
device (modem) that Core16550 is ready to establish
a communications link. It is programmed by the CPU
via the Modem Control Register.
DSR MMUART_<n>_PADS_MODEM
MMUART_<n>_FABRIC_MODEM
In Data Set Ready.
This active high signal is an input indicating when the
attached device (modem) is ready to set up a link with
Core16550. Core16550 passes this information to the
CPU via the Modem Status Register. This register
also indicates if the DSR signal has changed since
the last time the register was read.
CTS MMUART_<n>_PADS_MODEM
MMUART_<n>_FABRIC_MODEM
In Clear to Send.
This active high signal is an input showing when the
attached device (modem) is ready to accept data.
Core16550 passes this information to the CPU via the
Modem Status register. This register also indicates if
the CTS signal has changed since the last time the
register was read.