Embedded Solutions
Page 21 of 50
BIS3_IO_TERM
[$18] BiSerial III Termination Port read/write
Direction Control Port
DATA BIT
DESCRIPTION
31-0 Parallel Port Termination Control bits
FIGURE 13
PMC BISERIAL-III TERMINATION CONTROL PORT
When set (‘1’) the corresponding I/O line will be terminated. When cleared (‘0’) the
corresponding I/O line is not terminated. These bits are independent of the Mux control
definitions. When a bit is set to be terminated; the analog switch associated with that
bit is closed to create a parallel termination of approximately 100
Ω
. In most systems
the receiving side is terminated, and the transmitting side is not. The drivers can
handle termination on both ends.
BIS3_IO_MUX
[$1C] BiSerial III Mux Port read/write
Direction Control Port
DATA BIT
DESCRIPTION
31-0 Parallel Port Mux Control bits
FIGURE 14
PMC BISERIAL-III MUX CONTROL PORT
When set (‘1’) the corresponding bit is set to State-Machine control. When cleared (‘0’)
the corresponding bit is set to parallel port operation. The Mux control definition along
with the Data, Direction and Termination registers allows for a bit-by-bit selection of
operation under software control.
