multiPort: Advanced Digital I/O Ports (aDIO™)

Ensure that the BIOS setup has the multiPort set to aDIO mode. This board supports 16 bits of TTL/CMOS compatible digital I/O (TTL signaling). These I/O lines are grouped into two ports, Port 0 and Port 1. Port 0 is bit programmable; Port 1 is byte programmable. Port 0 supports RTD’s Advanced Digital Interrupt modes. The three modes are strobe, match and event. Strobe mode generates an interrupt and latches Port 0 when the strobe input transitions from low to high. Match mode generates an interrupt when an 8-bit pattern is received in parallel that matches the match mask register. Event mode generates an interrupt when a change occurs on any bit. In any mode, masking can be used to monitor selected lines.

When the CPU boots, all digital I/O lines are programmed as inputs, meaning that the digital I/O line’s initial state is undetermined. If the digital I/O lines must power up to a known state, an external 10 kΩ resistor must be added to pull the line high or low.

The 8-bit control read/write registers for the digital I/O lines are located from I/O address 450h to 454h. These registers are written to zero upon power up. From 450h to 454h, the name of these registers are Port 0 data, Port 1 data, Multi-Function, DIO-Control, and Wake Control register.

Note RTD provides drivers that support the aDIO interface on popular operating systems. RTD recommends using these drivers instead of accessing the registers directly.

Digital I/O Register Set

Table 44 Port 0 Data I/O Address 450h

D7

D6

D5

D4

D3

D2

D1

D0

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

 

 

 

 

 

 

 

 

Port 0 Data register is a read/write bit direction programmable register. A particular bit can be set to input or output. A read of an input bit returns the value of port 0. A read of an output bit returns the last value written to Port 0. A write to an output bit sends that value to port 0.

Table 45 Port 1 Data I/O Address 451h

D7

D6

D5

D4

D3

D2

D1

D0

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2

P1.1

P1.0

Port 1 Data register is a read/write byte direction programmable register. A read on this register when it is programmed to input will read the value at the aDIO connector. A write on this register when it is programmed as output will write the value to the aDIO connector. A read on this register when it is set to output will read the last value sent to the aDIO connector.

Table 46 Multi-Function I/O Address 452h

D7

D6

D5

D4

D3

D2

D1

D0

The multi-function register is a read/write register whose contents are set by the DIO-Control register. See the DIO-Control register description for a description of this register.

62 CMX158886 cpuModule

BDM-610000049 Rev G

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IBM BDM-610000049 MultiPort Advanced Digital I/O Ports aDIO, Digital I/O Register Set, Port 0 Data I/O Address 450h
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BDM-610000049 specifications

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