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RTD Embedded Technologies, Inc. | www.rtd.com 26 COM16155ER/COM16155RER User’s Manual

6.1.5 DIGITAL I/O

COM16155 allows bit programmable direction for all digital I/O bits. COM17045 compatibility is described later. Note the digital I/O registers

are accessed at 404h – 407h above the GPS/GSM COM port. These addresses are used to interface to the digital I/O port. The 16 bits each

have a direction bit. If the direction bit is set to output, a value written to the data bit is provided on the connector. A read will result in the value

on the connector pin (i.e. the output value). If the direction is set to input, a value written to the data bit is ignored and a read will result in the

value on the connector pin.

Table 16: Digital I/O Data (GPS/GSM BASE + 404h)

Default: 0x00

BIT

FUNCTION

DIRECTION

Bit 0

DIO0

CN8 Pin 2

Bit 1

DIO1

CN8 Pin 3

Bit 2

DIO2

CN8 Pin 4

Bit 3

DIO3

CN8 Pin 5

Bit 4

DIO4

CN8 Pin 6

Bit 5

DIO5

CN8 Pin 7

Bit 6

DIO6

CN8 Pin 8

Bit 7

DIO7

CN8 Pin 9

Table 17: Digital I/O Data (GPS/GSM BASE + 405h)

Default: 0x00

BIT

FUNCTION

DIRECTION

Bit 0

DIO8

CN8 Pin 12

Bit 1

DIO9

CN8 Pin 13

Bit 2

DIO10

CN8 Pin 14

Bit 3

DIO11

CN8 Pin 15

Bit 4

DIO12

CN8 Pin 16

Bit 5

DIO13

CN8 Pin 17

Bit 6

DIO14

CN8 Pin 18

Bit 7

DIO15

CN8 Pin 19

Table 18: Digital I/O Direction (GPS/GSM BASE + 406h)

Default: 0xFF

BIT

FUNCTION

DIRECTION

Bit 0

DIO0

0 = INPUT

1 = OUTPUT

Bit 1

DIO1

0 = INPUT

1 = OUTPUT

Bit 2

DIO2

0 = INPUT

1 = OUTPUT

Bit 3

DIO3

0 = INPUT

1 = OUTPUT

Bit 4

DIO4

0 = INPUT

1 = OUTPUT

Bit 5

DIO5

0 = INPUT

1 = OUTPUT

Bit 6

DIO6

0 = INPUT

1 = OUTPUT

Bit 7

DIO7

0 = INPUT

1 = OUTPUT

Table 19: Digital I/O Direction (GPS/GSM BASE + 407h)

Default: 0x00

BIT

FUNCTION

DIRECTION

Bit 0

DIO8

0 = INPUT

1 = OUTPUT

Bit 1

DIO9

0 = INPUT

1 = OUTPUT

Bit 2

DIO10

0 = INPUT

1 = OUTPUT

Bit 3

DIO11

0 = INPUT

1 = OUTPUT

Bit 4

DIO12

0 = INPUT

1 = OUTPUT

Bit 5

DIO13

0 = INPUT

1 = OUTPUT

Bit 6

DIO14

0 = INPUT

1 = OUTPUT

Bit 7

DIO15

0 = INPUT

1 = OUTPUT

6.1.6 RTD ISA ID

RTD ID is a method to identify a board on the ISA bus. There are two 8-bit registers mapped at BA + 800h and BA + 801h. The registers

can be read as two 8-bit or one 16-bit. An internal pointer is auto-incremented with every read to either address so the data read will step

through each index as indicated below. The pointer is set to zero at reset and can be reset to zero by a read to BA + 802h.

Table 20: RTD ID DATA READ Indexes

Index

Data

8-Bit Read

16-Bit Read

Device ID

55h

6155h

Device ID

61h

—

RTD Vendor ID

35h

1435h

RTD Vendor ID

14h

—

EPLD Revision

Revision

LSD

Revision

EPLD Revision

Revision

MSD

—

6–9

Reserved

Ignore

Board Name String

—

Board Name String

1 2 ... 21 22 23 24 25 26 27 28 29 30 31

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