DS26900

JTAG Multiplexer/Switch

Fully MicroTCA™-Compliant JTAG Multiplexer/Switch

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Overview

Efficient Solution for Star Architecture JTAG
Provides Transparent Communications Between the Arbitrated Master and a Selected Secondary Port
Single-Package Solution Provides 18 Secondary Ports
Two-Package Cascade Configuration Provides 36 Secondary Ports
Three Arbitrated Master Ports
Autodetection of Port Presence
Internal Pullup/Down Resistors
Two 32-Bit Scratchpad Registers
Four GPIO Pins for Read/Write Control and Signaling Applications
Operation Up to 50MHz
Signal Path Modification Options
Redundancy with High-Impedance Pin
Independent Periphery JTAG
Configuration Mode Uses IEEE 1149.1 TAP Controller
Supports Live Insertion/Withdrawal
3.3V Operation
Industrial Temperature Operation
RoHS-Compliant Packaging

The DS26900 is a JTAG signal multiplexer providing connectivity between one of three master ports and up to 18 (36 in cascade configuration) secondary ports. The device is fully configurable from any one of the three master ports. The DS26900 can automatically detect the presence JTAG devices on the secondary ports.

The DS26900 can be used in multiple configurations including as a single device, two cascaded devices, or two redundant devices.

All device control and configuration is accomplished through standard JTAG operations via the selected master port.

Applications