Digital I/O
The digital I/O ports include 24 bits of programmable I/O. The digital I/O is divided into three
bytes (A, B, and C) as described in the chart below. All digital I/O lines are accessed via the 25-
pin connector on the front of the RZ6. Earlier versions (serial number < 2000) were limited to 8
bits. See
The digital I/O is con
fi
gured in the
.
The data direction for the Digital I/O is also con
fi
gured in the Synapse RZn Hal, or in RPvdsEx
with the RZ6_Control macro.
The RZ digital I/O ports have different voltage outputs and logic thresholds depending on the
type. Below is a table listing the different voltage outputs and thresholds for both types.
The electrostatic speaker driver is designed to work exclusively with TDT's [electrostatic series speakers]https://
www.tdt.com/docs/hardware/ec1-es1-electrostatic-speaker/){:target="_blank"}. Do NOT attempt to use any other
speaker.
Note
If the electrostatic speaker driver is not being used, make sure that the ON/OFF switch is in the OFF position to
reduce noise on the RZ6 analog I/O.
Important
Digital I/O
Description
DB25
BNCs
Notes
Byte A
bits 0 - 7
Yes
No
byte addressable
Byte B
bits 0 - 7
Yes
No
byte addressable
Byte C
bits 0 - 7
Yes
No
bit addressable
Digital I/O Type
Output High
Output Low
Input High
Input Low
Port A & Port B
5 V
0 V
>= 2.5 V
0 - 2.45 V
Port C
3.3 V
0 V
>= 1.5 V
0 - 1.4 V
RZ6 Multi I/O Processor | 15
