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SCANSTA112SM-SCANSTA112VS
7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer
SCANSTA112
7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer
General DescriptionThe SCANSTA112 extends the IEEE Std. 1149.1 test bus
intoa multidrop test bus environment. The advantageofa
multidrop approach overa single serial scan chainis im-
proved test throughput and the abilityto removea board
from the system and retain test accessto the remaining
modules. Each SCANSTA112 supports upto7 local
IEEE1149.1 scan chains which canbe accessed individually combined serially.
Addressingis accomplishedby loadingthe instruction regis-
ter witha value matching thatof the Slot inputs. Backplane
and inter-board testing can easilybe accomplishedby park-
ing the local TAP Controllersin oneofthe stable TAP Con-
troller statesviaa Park instruction. The 32-bit TCK counter
enables builtin self test operationstobe performedon one
port while other scan chainsare simultaneously tested.
The STA112 hasa unique featurein thatthe backplane port
andthe LSP0 port are bidirectional. They canbe configured alternativelyactasthe masteror slave portsoan alternate
test master can take controlofthe entire scan chain network
from the LSP0 port while the backplane port becomesa
slave.
Features True IEEE 1149.1 hierarchical and multidrop
addressable capability The8 address inputs supportupto 249 unique slot
addresses,an Interrogation Address, Broadcast
Address, and4 Multi-cast Group Addresses (address
000000is reserved)7 IEEE 1149.1-compatible configurable local scan ports Bi-directional Backplane and LSP0 ports are
interchangeable slave ports Capableof ignoring TRSTof the backplane port whenit
becomes the slave. Stitcher Mode bypasses level1 and2 protocols Mode Register0 allows local TAPstobe bypassed,
selectedfor insertion intothe scan chain individually,or
seriallyin groupsof twoor three Transparent Mode canbe enabled witha single
instructionto conveniently bufferthe backplane IEEE
1149.1 pinsto thoseona single local scan port General purpose local port passthrough bits are useful
for delivering write pulsesfor Flash programmingor
monitoring device status. Known Power-up state TRSTonall local scan ports 32-bit TCK counter 16-bit LFSR Signature Compactor Local TAPs can become TRI-STATEviathe OE inputto
allowan alternate test masterto take controlofthe local
TAPs (LSP0-3 havea TRI-STATE notification output) 3.0-3.6V VCC Supply Operation Supports live insertion/withdrawal
FIGURE1. Typical useof SCANSTA112for board-level managementof multiple scan chains.
May 2004
SCANST
7-port
Multidrop
IEEE
(JT
AG)
Multiplexer
