User Guide

12
Note
Port names have the name of the MMUART instance as a prefix, e.g. MMUART_<n>_TXD_RXD.
Fabric 'main connection' input ports names have "F2M" as a suffix, e.g. MMUART
_<n>_RXD_F2M.
Fabric 'extra connection' input ports names have "I2F" as a suffix, e.g.
MMUART_<n>_TXD_RXD_I2F.
Fabric output and output-enable ports names have "M2F" and "M2F_OE" as a suffix, e.g.
MMUART_<n> _TXD_RXD_M2F and MMUART_<n>_ TXD_RXD_M2F_OE.
PAD ports are automatically promoted to top throughout the design hierarchy.
RI MMUART_<n>_PADS_MODEM
\MMUART_<n>_FABRIC_MODEM
in Ring Indicator.
This active high signal is an input showing when the
attached device (modem) has sensed a ring signal on
the telephone line. Core16550 passes this information
to the CPU via the Modem Status Register. This
register also indicates when the RI trailing edge was
sensed.
DCD MMUART_<n>_PADS_MODEM
MMUART_<n>_FABRIC_MODEM
In Data Carrier Detect.
This active high signal is an input indicating when the
attached device (modem) has detected a carrier.
Core16550 passes this information to the CPU via the
Modem Status Register. This register also indicates if
the DCD signal has changed since the last time the
register was read.
Table 5-1 • Port Description
Port Name Port Group Direction Description