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参数资料
| 型号： | SCANPSC110FSCX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 微控制器/微处理器 |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDSO28 |
| 封装： | 0.300 INCH, MS-013, SOIC-28 |
| 文件页数： | 8/25页 |
| 文件大小： | 269K |
| 代理商： | SCANPSC110FSCX |
www.fairchildsemi.com
16
SCAN
PSC1
10
F
Special Features (Continued)
This moves the local chain TAP Controllers to the synchro-
nization state (Run-Test/Idle), where they stay until syn-
chronization occurs. If the next state of the SCANPSC110F
TAP Controller is Run-Test/Idle, TMSL is connected to
TMSB and the local TAP Controllers are synchronized to
the SCANPSC110F TAP Controller as shown in Figure 12.
If the next state after Update-IR were Select-DR, TMSL
would remain LOW and synchronization would not occur
until the SCANPSC110F TAP Controller entered the Run-
Test/Idle state, as shown in Figure 11.
Each local port has its own Local Scan Port Controller. This
is necessary because the LSPN can be configured in any
one of eight (8) possible combinations. Either one, some,
or all of the local ports can be accessed simultaneously.
Configuring the LSPN is accomplished with the mode reg-
ister, in conjunction with the UNPARK instruction.
The LSPN can be unparked in one of seven different con-
figurations, as specified by bits 0-2 of the mode register.
Using multiple ports presents not only the task of synchro-
nizing the SCANPSC110F TAP Controller with the TAP
Controllers of an individual local port, but also of synchro-
nizing the individual local ports to one another.
When multiple local ports are selected for access, it is pos-
sible that two ports are parked in different states. This
could occur when previous operations accessed the two
ports separately and parked them in the two different
states. The LSP Controllers handle this situation gracefully.
Figure 12 shows the UNPARK instruction being used to
access LSP1, LSP2, and LSP3 in series (mode register =
“XXX0X111” binary). LSP1 and LSP2 become active as the
SCANPSC110F controller is sequenced through the Run-
Test/Idle state. LSP3 remains parked in the Pause-DR
state until the SCANPSC110F TAP Controller is sequenced
through the Pause-DR state. At that point, all three local
ports are synchronized for access via the active scan
chain.
FIGURE 12. Synchronization of the Three Local Scan Ports (LSP1, LSP2, and LSP3)
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