Rs-485 Mode Line Driver Control; Serial Port Connectors; Gpio - VersaLogic VL-EPME-30ECP Hardware Reference Manual

RS-485 Mode Line Driver Control

The transmit line driver can be automatically turned on and off based on data availability in the
UART output FIFO. This mode can be enabled in the BIOS Setup utility. The transmit line driver
can be enabled in the BIOS Setup utility.

Serial Port Connectors

The pinouts of the DB9M connectors apply to the serial connectors on the VL-CBR-5015
paddleboard.
These connectors use IEC 61000-4-2-rated TVS components to help protect against ESD
damage.
2
I C
Pins 14 and 15 of I/O connector J18 connect to the first of the seven I
"Bay Trail" processor. The Bengal has a 3.3 V I
are included in the Bengal design. The 3.3 V power for this interface is the same as used for the
digital I/O interface. By default, this power is turned off when the processor is in a sleep state.

GPIO

I/O connector J18 provides two general-purpose I/O signals:

GPIO1 on pin 20

GPIO2 on pin 18
These signals connect to the FPGA on the Bengal.
Bengal (VL-EPMe-30) Reference Manual
Table 13: COM1-2 Pinout – VL-CBR-5015 Connector J3
COM1 COM2
Top DB9 Bottom DB9
J3 Pin J3 Pin
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
RS-232 RS-422
— —
RXD* RxD-
TXD* TxD-
— —
Ground Ground
— —
RTS TxD+
CTS RxD+
— —
2
C interface. The required pullups for this interface
Interfaces and Connectors
RS-485
—
RxD-
TxD-
—
Ground
—
TxD+
RxD+
—
2
C ports on the Intel Atom
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