SCANSTA101

SNLS057J – MAY 2002 – REVISED APRIL 2013

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Table 18. Status Register (STATUS) ($01) (1)

Bit(s)

Type

Field

Address Offset

Reset Value

Reset Source

15

RW

Results of Compare (2)

0

0b

SYS_RST

14

RW

BIST Running

0

0b

SYS_RST

13

RW

Memory BIST Result

0

0b

SYS_RST

12

RW

TDO Status Half-empty (3)

0

0b

SYS_RST

11

RW

TDO Status Empty

0

0b

SYS_RST

10

RW

TDI Status Full

0

0b

SYS_RST

9

RW

TDI Status Half-full (3)

0

0b

SYS_RST

8

RW

Using Sequencer

0

0b

SYS_RST

7:3

RO

Reserved Using Vector x (4)

0

00000b

2:0

RW

Using Vector x

0

000b

SYS_RST

(1)

Write capability to the register is only for test and debug purposes. Drivers should disable writes to the register during normal operation.

(2)

Results of Compare bit is toggled after a compare is complete and it is set to the mismatch state when sequencer is kicked off again.

Remains in last state until next compare completed or until set to the mismatch state.

(3)

Half full or half empty designates 56 long words.

(4)

Reserved Using Vector x for future growth for the number of vectors.

Results of Compare

Results of compare between TDI_SM and Expected memory space

'1'

Compare match

'0'

Compare mismatch

BIST Running

Indicates the BIST operation is still active

'1'

BIST operation active

'0'

BIST operation complete or BIST operation not running

Memory BIST Result

ScanMaster BIST result. BIST result will be held until overwritten by next BIST operation.

'1'

Passed memory BIST

'0'

Failed memory BIST

TDO Status Half

TDO_SM memory space status half empty

'1'

TDO_SM memory space half empty

'0'

TDO_SM memory space not half empty

TDO Status Empty

TDO_SM memory space status empty

'1'

TDO_SM memory space empty

'0'

TDO_SM memory space not empty

TDI Status Full

TDI_SM memory space status full

'1'

TDI_SM memory space full

'0'

TDI_SM memory space not full

TDI Status Half

TDI_SM memory space status half full

'1'

TDI_SM memory space half full

'0'

TDI_SM memory space not half full

Using Sequencer

Sequencer active and processing. Bit cleared when sequence complete.

'1'

Sequencer active

'0'

Sequencer inactive

Using Vector<2:0>

Using Vector x designates the vector "x" currently running, where "x" is the vector number, a binary encoding of

bits <2:0>. Only vectors 1 through 4 are valid. Vectors 5 through 7 reserved for future use. Field cleared when

vectors complete.

'000'

No vector active.

'001'

Vector 1 active.

'010'

Vector 2 active.

'011'

Vector 3 active.

'100'

Vector 4 active.

26

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