Serial Port Conþguration; Serial Port Dce Configuration; Serial Port Dte Configuration; Configuration Register - Motorola MVME712-10 User Manual

Serial Port Configuration
The four RJ45 EIA-232-D serial ports are factory configured as terminal (DTE)
for connection to modem. However, they can be used as modem-to-terminal
(DCE) by using an appropriate user-supplied external DCE adapter.
Serial Port DCE Configuration
Figure 2-2 shows the schematic representation of the DCE configuration of
serial ports 1 through 4, using a user-supplied external DCE adapter.
Serial Port DTE Configuration
Figure 2-3 shows the schematic representation of the DTE configuration of
serial ports 1 through 4, using a user-supplied external DTE adapter.
Configuration Register
Figure 2-4 illustrates the function of the configuration register on the
MVME712-10. The application software on the MVME166 can read the
configuration information to identify the transition board(s) in the system.
On the MVME166, the MC68230 interrupt level is the same as the CD2401. The
interrupt vector is as programmed in the MC68230. The interrupt priority is (1)
first the CD2401, and (2) then the MC68230.
To read the configuration information, the MC68230 (PI/T) must be
programmed as follows:
Port A direction must be:
Ð Mode 0, submode 1X
Ð Bits 7 to 4 as inputs
Ð Bits 3 to 0 as outputs.
Port B direction must be:
Ð Mode 0, submode 1X
Ð Bit 7 as an output
Ð Bits 6 to 0 as inputs
Write port B bits 7 to 0 set configuration mode. Now port A bits 3 to 0 are used
to select a port.
MVME712-10/D1
MVME712-10 Module Preparation
2
2-3