SCANSTAEVK/NOPB National Semiconductor, SCANSTAEVK/NOPB Datasheet - Page 14

SCANSTAEVK/NOPB

Manufacturer Part Number

SCANSTAEVK/NOPB

Description

Manufacturer

National Semiconductor

Datasheet

1.SCANSTAEVKNOPB.pdf (31 pages)

Specifications of SCANSTAEVK/NOPB

Lead Free Status / RoHS Status

Compliant

Current page: 14 of 31
Download datasheet (918Kb)

www.national.com

Instructions

DGPIO

SGPIO

Other Undefined

Level 2 Protocol

Note 5: All other instructions act on selected STA111s only.

Note 6: Commands added to HDL version of STA111.

LEVEL 2 INSTRUCTON DESCRIPTIONS:

BYPASS: The BYPASS instruction selects the bypass reg-

ister for insertion into the active scan chain when the

’STA111 is selected.

EXTEST: The EXTEST instruction selects the boundary-

scan register for insertion into the active scan chain. The

boundary-scan register consists of seven sample only shift

cells connected to the S

the EXTEST instruction performs the same function as the

SAMPLE/PRELOAD instruction, since there aren’t any scan-

nable outputs on the device.

SAMPLE/PRELOAD: The SAMPLE/PRELOAD instruction

selects the boundary-scan register for insertion into the ac-

tive scan chain. The boundary-scan register consists of

seven sample only shift cells connected to the S

inputs.

IDCODE: The IDCODE instruction selects the device identi-

fication register for insertion into the active scan chain. When

IDCODE is the current active instruction the device identifi-

cation 0FC0F01F Hex is captured upon exiting the

Capture-DR state.

UNPARK: This instruction unparks the Local Scan Port Net-

work and inserts it into the active scan chain as configured

by Mode Register

Table 7). Unparked LSPs are sequenced synchronously with

the ’STA111’s TAP controller. When a LSP has been parked

in the Test-Logic-Reset or Run-Test/Idle state, it will not

become unparked until the ’STA111’s TAP Controller enters

the Run-Test/Idle state following the UNPARK instruction. An

LSP which has been parked in Test-Logic-Reset will be

parked in Run-Test/Idle upon update of an UNPARK instruc-

tion. If an LSP has been parked in one of the stable pause

states (Pause-DR or Pause-IR), it will not become unparked

until the ’STA111’s TAP Controller enters the respective

pause state. (See Figure 9, Figure 10, Figure 11, and Figure

12).

PARKTLR: This instruction causes all unparked LSPs to be

parked in the Test-Logic-Reset TAP controller state and

removes the LSP network from the active scan chain. The

LSP controllers keep the LSPs parked in the Test-Logic-

(and Mode Register

(0-6)

and OE inputs. On the ’STA111,

(Continued)

Hex Op-Code

TABLE 5. Level 2 Protocol and Op-Codes (Continued)

TBD

in the HDL) (see

(0-6)

Binary Op-Code

1011 0100

1011 0101

1011 0110

1011 0111

1011 1000

1011 1001

1011 1010

1011 1011

1011 1100

1011 1101

1011 1110

1011 1111

TBD

and OE

Reset state by forcing their respective TMS

constant logic 1 while the LSP controller is in the Parked-

TLR state (see Figure 4).

PARKRTI: This instruction causes all unparked LSPs to be

parked in the Run-Test/Idle state. The update of the

PARKRTI instruction MUST immediately be followed by a

TMS

When a LSP

TMS

nized with the TAP Controller state transitions of the

’STA111. When the instruction register is updated with the

PARKRTI instruction, TMS

0, causing the unparked local TAP Controllers to be parked

in the Run-Test/Idle state. When an LSP

removed from the active scan chain.

PARKPAUSE: The PARKPAUSE instruction has dual func-

tionality. It can be used to park unparked LSPs or to unpark

parked LSPs. The instruction places all unparked LSPs in

one of the TAP Controller pause states. A local port does not

become parked until the ’STA111’s TAP Controller is se-

quenced through Exit1-DR/IR into the Update-DR/IR state.

When the ’STA111 TAP Controller is in the Exit1-DR or

Exit1-IR state and TMSB is high, the LSP controller forces a

constant logic 0 onto TMSL thereby parking the port in the

Pause-DR or Pause-IR state respectively (see Figure 4).

Another instruction can then be loaded to reconfigure the

local ports or to deselect the ’STA111 (i.e., MODESEL, GO-

TOWAIT, etc.).

If the PARKPAUSE instruction is given to a whose LSPs are

parked in Pause-IR or Pause-DR, the parked LSPs will

become unparked when the ’STA111’s TAP controller is se-

quenced into the respective Pause state.

The PARKPAUSE instruction was implemented with this

dual functionality to enable backplane testing (interconnect

testing between boards) with simultaneous Updates and

Captures.

Simultaneous Update and Capture of several boards can be

performed by parking LSPs of the different boards in the

Pause-DR TAP controller state, after shifting the data to be

updated into the boundary registers of the components on

each board. The broadcast address is used to select all

Data Register

Dedicated GPIO Register

DedicateD GPIO Register

Dedicated GPIO Register

Shared GPIO Register

Device Identification Register

=0 (to enter the RTI state) in order to assure stability.

and the LSP

is active (unparked), its TMS

controller state transitions are synchro-

will be forced to a constant logic

is parked, it is

signals follow

output with a