GT5910 TTL I/O Module

The GT5910 TTL I/O Module is the typical I/O stage utilized with the GT5150 product. The GT5910 interfaces to the GT5150 and can be configured as Input or Output in groups of 8 I/O pins. Additionally, the GT5910 has on-board terminators that are software controlled (On/Off).

A picture of the GT5910 is displayed in the figure below:

GT5910 TTL I/O Module Card

Architecture

The GT5910 employs 2 double-density FCT166245ET transceivers to provide up to 32 channels of bi-directional TTL level I/O. The module supports configurations of 8, 16, and 32 bi-directional channels. On-board register/MUX logic controls the path of data in both input and output modes of operation and determines the output state after a sequencer HALT. SIP sockets provide the optional installation of terminators; 180/390-ohm resistor networks are factory installed.

Programming

The GT5910 Module is controlled by its host, the GT515X or GT25/50 (using GT5900) and provides the following programmable functions:

●     Set the width, number of active channels, as 32, 16, or 8 channels.

●     Global Output Reset

●     Tri-state Output on sequencer HALT

●     Hold Last Value output on sequencer HALT

●     Termination Enable/Disable

●     Enable/disable all 8 outputs in a group, four groups in total, in each vector step.

Block Diagram

A block diagram of the GT5910 is displayed in the figure below:

GT5910 Block Diagram

Function

The GT5910 TTL I/O Module interfaces GT515X DIO boards to external equipment and UUTs that use standard TTL logic levels.

Control

Width setting - Set the number of active channels, as 32, 16, or 8 channels causing the memory depth to increase/decrease by the same factor. E.g. setting the width to 16 will decrease the number of active channels by two and increase the available number of memory step by two.

Tri State – High impedance outputs can be enabled or disabled in groups of eight during vector execution. The high impedance output state supports the connection of DIO boards to a UUT bus up to 32 bits wide.

Retain Last Value – The output mode can be configured to either retain the last value on vector halt, or switch to high impedance.

Line Terminations – Terminators can be switched in or out under program control. 180/330 W or 330/390 W SIPs are standard. SIPs mount in sockets to accept other (user-supplied) termination values.

UUT-Side I/O Data

The table below describes a GT515X(J4)/GT5900(J10 and J11) interface to UUT data signals when a GT5910 I/O Module is mounted on the motherboard.

Types: I/O = Input/Output, P = Power or Ground

                      UUT-Side I/O Connections with a GT5910 Mounted

The table above describes GT515X signals at J4 and Carrier signals at J11. It also describes Carrier signals at J10 when the Carrier input is connected for I/O data.

The UUT interface is set for single-ended UUTs.

Specifications