SCANSTA111 National Semiconductor Corporation, SCANSTA111 Datasheet - Page 12

• Manufacturer Part Number: SCANSTA111
• Description: Enhanced Scan Bridge Multidrop Addressable Ieee 1149.1 Jtag Port
• Manufacturer: National Semiconductor Corporation

www.national.com
Level 2 Protocol
Pause-IR and the active scan chain consists of: TDI
through the instruction register (or the IDCODE register) and
out through TDO
TDI
The UNPARK instruction (described later) is used to insert
one or more local scan ports into the active scan chain.
Table 7 describes which local ports are inserted into the
chain, and in what order.
LEVEL 2 INSTRUCTION TYPES There are two types of
instructions (reference Table 5):
1. Instructions that insert a ’STA111 register into the active
B
scan chain so that the register can be captured or up-
→ Instruction Register → TDO
B
.
(Continued)
B
B
12
2. Instructions that configure local ports or control the op-
dated (BYPASS, SAMPLE/PRELOAD, EXTEST, ID-
CODE, MODESEL, MCGRSEL, LFSR-SEL, CNTR-
SEL).
eration of the linear feedback shift register and counter
registers (UNPARK, PARKTRL, PARKRTI, PARK-
PAUSE, GOTOWAIT, SOFTRESET, LFSRON, LFS-
ROFF, CNTRON, CNTROFF). These instructions, along
with any other yet undefined Op-Codes, will cause the
device identification register to be inserted into the ac-
tive scan chain.