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參數(shù)資料
| 型號(hào)： | SNJ54LVT8986HV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3.3-V LINKING ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS |
| 中文描述： | 3.3 V的連接尋址掃描港口多點(diǎn)尋址IEEE標(biāo)準(zhǔn)1149.1（JTAG接口）技術(shù)咨詢收發(fā)器 |
| 文件頁數(shù)： | 14/51頁 |
| 文件大小： | 880K |
| 代理商： | SNJ54LVT8986HV |
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SN54LVT8986, SN74LVT8986
3.3-V LINKING ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS759B
–
OCTOBER 2002
–
REVISED APRIL 2003
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
application information
In application, the LASP is used at each of several serially-chained groups of IEEE Std 1149.1-compliant
devices. The LASP for each such group is assigned an address (via inputs A
9
–
A
0
) that is unique from that
assigned to LASPs for the remaining groups. Additionally, within each group, each LASP is assigned a position
(via inputs P
2
–
P
0
) that is unique from that assigned to LASPs in the same groups. This allows individually
configuring the secondary scan ports of each LASP within a group with a single linking shadow protocol when
cascaded. Each LASP is wired at its primary TAP to common (multidrop) TAP signals (sourced from a central
IEEE Std 1149.1 bus master) and fans out its secondary TAP signals to a specific linked group of
IEEE Std 1149.1-compliant devices with which it is associated. Additionally, LASPs can be cascaded together
to link additional secondary scan ports to one primary scan port. LASPs also can coexist with existing boards
implementing the TI ASP (8996). The ASP has one primary to one secondary port, but a LASP has three
secondary ports per device; Figure 1 shows an example.
1149.1
1149.1
ASP
(8996)
1149.1-Compliant
Device Chain
LASP
(8986)
1149.1
Bus
Master
To
Other
Modules
1149.1
1149.1
1149.1
LASP
(8986)
1149.1
1149.1
1149.1
LASP
(8986)
1149.1
Cascading
Capability
NOTE A: 1149.1 means IEEE Std 1149.1.
Figure 1. LASP/ASP Application
This application allows the LASP to be wired to a four- or five-wire multidrop test access bus, such as might be
found on a backplane. Each LASP would then be on a module, for example, a printed circuit board (PCB) that
contains a serial chain of IEEE Std 1149.1-compliant devices and that would plug into the module-to-module
bus (e.g., backplane). In the complete system, the LASP linking shadow protocols would allow the selection of
the scan chain on a single module. Then, the selected scan chain could be controlled, via the multidrop TAP,
as if it were the only scan chain in the system. Normal IR and DR scans could then be performed to accomplish
the module test objectives. If ASPs are to be addressed, they would be selected by the standard shadow
protocol.
Once scan operations to a given module are complete, another module can be selected in the same fashion,
at which time the LASP-based connection to the first module is dissolved. This procedure can be continued
progressively for each module to be tested. Finally, one of two global addresses can be issued to either leave
all modules unselected [disconnect address (DSA)] or to deselect and reset scan chains for all modules [reset
address (RSA)].
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