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參數資料
| 型號： | SN74LVT8980FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | EMBEDDED TEST-BUS CONTROLLERS IEEE STD 1149.1 JTAG TAP MASTERS WITH 8-BIT GENERIC HOST INTERFACES |
| 中文描述： | 嵌入式測試總線控制器IEEE標準1149.1 JTAG接口，8咨詢大師比特通用主機接口 |
| 文件頁數： | 22/34頁 |
| 文件大?。?/td> | 495K |
| 代理商： | SN74LVT8980FK |
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SN54LVT8980, SN74LVT8980
EMBEDDED TEST-BUS CONTROLLERS
IEEE STD 1149.1 (JTAG) TAP MASTERS WITH 8-BIT GENERIC HOST INTERFACES
SCBS676C – DECEMBER 1996 – REVISED AUGUST 1997
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
state diagram description
The state diagram shown in Figure 8 is in accordance with IEEE Std 1149.1-1990. The TAP controller proceeds
through its states based on the level of TMS at the rising edge of TCK.
As shown, the TAP controller consists of 16 states. There are six stable states (indicated by a looping arrow in
the state diagram) and ten unstable states. A stable state is a state the TAP controller can retain for consecutive
TCK cycles. Any state that does not meet this criterion is an unstable state.
There are two main paths though the state diagram: one to access and control the selected data register and
one to access and control the instruction register. Only one register can be accessed at any given time.
Test-Logic-Reset
Run-Test/Idle
Select-DR-Scan
Capture-DR
Shift-DR
Exit1-DR
Pause-DR
Update-DR
Exit2-DR
Select-IR-Scan
Capture-IR
Shift-IR
Exit1-IR
Pause-IR
Update-IR
Exit2-IR
TMS = H
TMS = L
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
TMS = L
Figure 8. TAP-Controller State Diagram
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