CS5535 datasheet(180/555 Pages) NSC

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Revision 0.8

TAP Controller Functional Description (Continued)

Table 4-39. TAP Controller Instruction Bits

Bit

Name

Description

TAPSCAN

TAP Scan. (Also USER[6].) This is a user bit added by National. Low indicates that an

internal scan chain will be accessed by the TAP.

22:17

USER[5:0]

User Bits 5 through 0. User bits used to identify an internal scan chain or, if bit 23 is

high, to access a special internal DR.

bistEnable[3]

BIST Enable Bit 3. Works in conjunction with bits [9:7]. See bits [9:7] description for

decode.

15:10

RSVD

Reserved. Should always be high.

9:7

bistEnable[2:0]

BIST Enable Bits 2 through 0. Works in conjunction with bit 16.

0000:

bistEn12

0010:

bistEn11

0100:

bistEn10

0110:

bistEn9

0001:

bistEn8

0011:

bistEn7

0101:

bistEn6

0111:

bistEn5

1000:

bistEn4

1010:

bistEn3

1100:

bistEn2

1110:

bistEn1

1011:

bistEn0

1001:

Does nothing [normally used for logic BIST]

1101:

Parallel scan

1111:

Scan through TAP

RSVD

Reserved. Should always be high.

forceDis

Force Disable. Active low bit that places all output pins in TRI-STATE mode. See

TRISTATE for details.

selectJtagOut

Select JTAG Output. Active low bit that allows boundary scan cells to control pads.

selectJtagIn

Select JTAG Output. Active low bit that allows boundary scan cells to drive data into

core logic of chip.

2:0

OP[2:0]

Operation Bits 2 through 0. Selects for how the JTAG chains are wired together.

000:

TDI -> Boundary Scan -> TDO

001:

TDI -> Boundary Scan -> Internal Scan -> Device ID -> Bypass -> TDO

010:

TDI -> Internal Scan -> TDO

011:

TDI -> Boundary Scan -> Internal Scan -> Device ID -> Bypass -> TDO

100:

TDI -> Internal Scan -> TDO

101:

TDI -> Internal Data Register -> TDO

110:

TDI -> Device ID -> TDO

111:

TDI -> Bypass -> TDO

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