SCANSTA111MT/NOPB National Semiconductor, SCANSTA111MT/NOPB Datasheet - Page 2

• Manufacturer Part Number: SCANSTA111MT/NOPB
• Description: IC SCAN BRIDGE MULTIDROP 48TSSOP
• Manufacturer: National Semiconductor

Specifications of SCANSTA111MT/NOPB

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 48-TSSOP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *SCANSTA111MT; *SCANSTA111MT/NOPB; SCANSTA111MT

www.national.com
LFSR
LSP
Local
Park/Unpark/Unparked Parked, unpark, and unparked, are used to describe the state of the LSP controller and the state of the local
TAP
Selected/Unselected
Active Scan Chain
Level 1 Protocol
Level 2 Protocol
PAD
LSB
MSB
Linear Feedback Shift Register. When enabled, will generate a 16-bit signature of sampled serial test data.
Local Scan Port. A four signal port that drives a local (i.e. non-backplane) scan chain. (e.g., TCK
TDO
Local is used to describe IEEE Std. 1149.1 compliant scan rings and the SCANSTA111 Test Access Port that
drives them. The term local was adopted from the system test architecture that the 'STA111 will most commonly
be used in; namely, a system test backplane with a 'STA111 on each card driving up to 3 local scan rings per
card. (Each card can contain multiple 'STA111s, with 3 local scan ports per 'STA111.)
TAP controllers (the local TAP controllers refers to the TAP controllers of the scan components that make up
a local scan ring). Park is also used to describe the action of parking a LSP (transitioning into one of the Parked
LSP controller states). It is important to understand that when a LSP controller is in one of the parked states,
TMS
Test Access Port as defined by IEEE Std. 1149.1.
Selected and Unselected refers to the state of the 'STA111 Selection Controller. A selected 'STA111 has been
properly addressed and is ready to receive Level 2 protocol. Unselected 'STA111s monitor the system test
backplane, but do not accept Level 2 protocol (except for the GOTOWAIT instruction). The data registers and
LSPs of unselected 'STA111s are not accessible from the system test master.
The Active Scan Chain refers to the scan chain configuration as seen by the test master at a given moment.
When a 'STA111 is selected with all of its LSPs parked, the active scan chain is the current scan register only.
When a LSP is unparked, the active scan chain becomes: TDI
scan ring registers
Level 1 is the protocol used to address a 'STA111.
Level 2 is the protocol that is used once a 'STA111 is selected. Level 2 protocol is IEEE Std. 1149.1 compliant
when an individual 'STA111 is selected.
A one bit register that is placed at the end of each local scan port scan-chain. The PAD bit eliminates the prop
delay that would be added by the 'STA111 LSPN logic between TDI
synchronizing the LSP TDI inputs to the falling edge of TCK
frequencies without violating setup and hold times.
Least Significant Bit, the right-most position in a register (bit 0).
Most Significant Bit, the left-most position in a register.
0
n
, TDI
is held constant, thereby holding or parking the local TAP controllers in a given state.
0
).
→
a PAD bit
TABLE 1. Glossary
→
TDO
B
. Refer to
2
Table 7
for Unparked configurations of the LSP network.
B
, thus allowing data to be scanned at higher
B
→
the current 'STA111 register
n
and TDO
(n+1)
or TDO
B
by buffering and
→
0
, TMS
the local
0
,