SCANSTA111MT/NOPB National Semiconductor, SCANSTA111MT/NOPB Datasheet - Page 10

• 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
Address Type
Direct Address
Interrogation Address 3A
Broadcast Address
Multi-Cast Group 0
Multi-Cast Group 1
Multi-Cast Group 2
Multi-Cast Group 3
Level 1 Protocol (Addressing Modes)
Note 4: Hex addresses 80' to FF' are only available when using the eighth address bit in the HDL version of the SCANSTA111. The Silicon part has seven address
lines and will treat the most-significant address bit as a don't care.
The SCANSTA111 supports single and multiple modes of ad-
dressing a 'STA111. The single mode selects one 'STA111
and is called Direct Addressing. More than one 'STA111 de-
vice can be selected via the Broadcast and Multi-Cast Ad-
dressing modes.
DIRECT ADDRESSING: The 'STA111 enters the Wait-For-
Address state when:
1.
2.
Each 'STA111 within a scan network must be statically con-
figured with a unique address via its S
'STA111 controller is in the Wait-For-Address state, data
shifted into bits 6 through 0 of the instruction register is com-
pared with the address present on the S
Update-IR state. If the seven (7) LSBs of the instruction reg-
ister match the address on the S
'STA111 becomes selected, and is ready to receive Level 2
Protocol (i.e., further instructions). When the 'STA111 is se-
lected, its device identification register is inserted into the
active scan chain.
All 'STA111s whose S
struction register address become unselected. An unselected
'STA111 will remain unselected until either its TAP Controller
its TAP Controller enters the Test-Logic-Reset state, or
its instruction register is updated with the GOTOWAIT
instruction (while either selected or unselected).
Hex Address
00 to 39,
40 to 7F.
(80 to FF
3B
3C
3D
3E
3F
FIGURE 6. Direct Addressing: Device Address Loaded into Instruction Register
(0-6)
address does not match the in-
(Note
(0-6)
inputs, (see
4))
(0-6)
TABLE 4. SCANSTA111 Address Modes
(0-6)
inputs. While the
Binary Address
00000000 to 00111010
01000000 to 01111111
(10000000 to
00111010
00111011
00111100
00111101
00111110
00111111
inputs in the
Figure
6) the
11111111(Note
10
enters the Test-Logic-Reset state, or its instruction register is
updated with the GOTOWAIT instruction.
BROADCAST ADDRESSING:
The Broadcast Address allows a tester to simultaneously se-
lect all 'STA111s in a test network. This mode is useful in
testing systems which contain multiple identical boards. To
avoid bus contention between scan-path output drivers on
different boards, each 'STA111's TDO
STATEd while in Broadcast mode. In this configuration, the
on-chip Linear Feedback Shift Register (LFSR) can be used
to accumulate a test result signature for each board that can
be read back later by direct-addressing each board's
'STA111.
MULTICAST ADDRESSING:
As a way to make the broadcast mechanism more selective,
the 'STA111 provides a Multi-cast addressing mode. A
'STA111's multi-cast group register (MCGR) can be pro-
grammed to assign that 'STA111 to one of four (4) Multi-Cast
groups. When 'STA111s in the Wait-For-Address state are
updated with a Multi-Cast address, all 'STA111s whose MC-
GR matches the Multi-Cast group will become selected. As in
Broadcast mode, TDO
cast mode.
4))
TDO
Normal IEEE Std. 1149.1
Force strong 0' or weak 1' as ones-complement
address is shifted out.
Always TRI-STATED
Always TRI-STATED
Always TRI-STATED
Always TRI-STATED
Always TRI-STATED
B
State
B
is always TRI-STATEd while in Multi-
B
buffer is always TRI-
10124509