SCANSTA111 datasheet(19/38 Pages) TI

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SCANSTA111

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SNLS060K – AUGUST 2001 – REVISED APRIL 2013

This signature compactor is used to compress serial data shifted in from the local scan chain, into a 16-bit

signature. This signature can then be shifted out for comparison with an expected value. This allows users to test

long scan chains in parallel, via Broadcast or Multi-Cast addressing modes, and check only the 16-bit signatures

from each module. The LFSR is initialized with a value of 0000 Hex upon reset.

32-BIT TCK COUNTER REGISTER

The 32-bit TCK counter register enables BIST testing that requires n TCK cycles, to be run on a parked LSP

while another 'STA111 port is being tested. The CNTRSEL instruction can be used to load a count-down value

into the counter register via the active scan chain. When the counter is enabled (via the CNTRON instruction),

and the LSP is parked, the local TCKs will stop and be held low when terminal count is reached.

The TCK counter is initialized with a value of 00000000 Hex upon reset.

Table 11. Dedicated GPIO Registern (HDL only)

BIT

Description

Input

Output

Table 12. Shared GPIO Registern

BIT

Description

Reserved

Input (TDI)

Output (TDO) Output (TMS)

Used in

Silicon

Default Value

SPECIAL FEATURES

TRANSPARENT MODE

While this mode is activated, the selected LSP n ports will follow the backplane ports. TRSTn is a buffered

version of TRSTB, TCKn is a buffered version of TCKB, TMSn is a buffered version of TMSB, TDOn is a buffered

version of TDIB and TDOB is a buffered version of TDIn. TRISTB and TRISTn are asserted when the state

machine is in either the Shift-DR or Shift-IR states. The unselected LSPs are placed in the PARKTLR state, and

their clocks are gated after 512 TCKB clock cycles.

Transparent Mode is controlled by 8 new instructions, TRANSPARENT0 through TRANSPARENT7. Transparent

Mode overrides any other active mode. When one of the transparent mode instruction is shifted into the

instruction register and the tap controller goes through the UPDATE-IR state, TRSTn will go high, and TMSn will

go low. This will force the targets connected to the LSPn ports to go into the RTI state. Then as the 'STA111

state machine goes into the RTI state, all of the LSPn signals will follow the back-plane signals. This is identical

to the method that is typically used to unpark an LSP. The 'STA111 will remain in this mode until a TRSTB is

asserted or a power cycle forces a reset. Once in the Transparent Mode, the 'STA111 will not be able to be reset

by a 5 TMS high reset.

The sequence of operations to use Transparent Mode on an LSP are as follows (example uses LSP0 ):

1. IR-Scan the 'STA111 address into the instruction register (address a 'STA111).

2. IR-Scan the TRANSPARENT0 instruction to enable Transparent Mode on LSP0. Transparent Mode is

enabled when the TAP enters the RTI state at the end of this shift operation (TRST0, TDO0, TMS0 and TCK0

become buffered versions of TRSTB, TDIB, TMSB and TCKB and TDOB becomes a buffered version of TDI0).

NOTE

Transparent Mode will persist until the 'STA111 is reset using TRSTB. The GOTOWAIT

and SOFTRESET instructions will not work in this mode.

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