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Members of the Texas Instruments

SCOPE E Family of Testability Products

Compatible With the IEEE Standard

1149.1-1990 (JTAG) Test Access Port and

Boundary-Scan Architecture

Control Operation of Up to Six Parallel

Target Scan Paths

Accommodate Pipeline Delay to Target of

Up to 31 Clock Cycles

Scan Data Up to 232 Clock Cycles

Execute Instructions for Up to 232 Clock

Cycles

Each Device Includes Four Bidirectional

Event Pins for Additional Test Capability

Inputs Are TTL-Voltage Compatible

EPIC E (Enhanced-Performance Implanted

CMOS) 1-mm Process

Packaged in 44-Pin Plastic Leaded Chip

Carrier (FN), 68-Pin Ceramic Pin Grid Array

(GB), and 68-Pin Ceramic Quad Flat

Packages (HV)

description

The ’ACT8990 test-bus controllers (TBC) are members of the Texas Instruments SCOPEE testability

integrated-circuit family. This family of components supports IEEE Standard 1149.1-1990 (JTAG) boundary

scan to facilitate testing of complex circuit-board assemblies. The ’ACT8990 differ from other SCOPEE

integrated circuits. Their function is to control the JTAG serial-test bus rather than being target

boundary-scannable devices.

The required signals of the JTAG serial-test bus – test clock (TCK), test mode select (TMS), test data input (TDI),

and test data output (TDO) can be connected from the TBC to a target device without additional logic. This is

done as a chain of IEEE Standard 1149.1-1990 boundary-scannable components that share the same

serial-test bus. The TBC generates TMS and TDI signals for its target(s), receives TDO signals from its target(s),

and buffers its test clock input (TCKI) to a test clock output (TCKO) for distribution to its target(s). The TMS, TDI,

and TDO signals can be connected to a target directly or via a pipeline, with a retiming delay of up to 31 bits.

Since the TBC can be configured to generate up to six separate TMS signals [TMS (5 –0)], it can be used to

control up to six target scan paths that are connected in parallel (i.e., sharing common TCK, TDI, and TDO

signals).

While most operations of the TBC are synchronous to TCKI, a test-off (TOFF) input is provided for output control

of the target interface, and a test-reset (TRST) input is provided for hardware/software reset of the TBC. In

addition, four event [EVENT (3–0)] I/Os are provided for asynchronous communication to target device(s).

Each event has its own event generation/detection logic, and detected events can be counted by two 16-bit

counters.

The TBC operates under the control of a host microprocessor/microcontroller via the 5-bit address bus

[ADRS (4–0)] and the 16-bit read/write data bus [DATA (15–0)]. Read (RD) and write (WR) strobes are

implemented such that the critical host-interface timing is independent of the TCKI period. Any one of

24 registers can be addressed for read and/or write operations. In addition to control and status registers, the

TBC contains two command registers, a read buffer, and a write buffer. Status of the TBC is transmitted to the

host via ready (RDY) and interrupt (INT) outputs.

Major commands can be issued by the host to cause the TBC to generate the TMS sequences necessary to

move the target(s) from any stable test-access-port (TAP) controller state to any other stable TAP state, to

execute instructions in the Run-Test/Idle TAP state, or to scan instruction or test data through the target(s). A

32-bit counter can be preset to allow a predetermined number of execution or scan operations.

Serial data that appears at the selected TDI input (TDI1 or TDI0) is transferred into the read buffer, which can

be read by the host to obtain up to 16 bits of the serial-data stream. Serial data that is transmitted from the TDO

output is written by the host to the write buffer.