參數(shù)資料
型號: DS21FT42
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封裝: 27 X 27 MM, BGA-300
文件頁數(shù): 103/115頁
文件大?。?/td> 534K
代理商: DS21FT42
DS21FF42/DS21FT42
88 of 115
TAP Controller State Machine Figure 23-2
23.3 INSTRUCTION REGISTER AND INSTRUCTIONS
The instruction register contains a shift register as well as a latched parallel output and is 3 bits in length.
When the TAP controller enters the Shift-IR state, the instruction shift register will be connected between
JTDI and JTDO. While in the Shift-IR state, a rising edge on JTCLK with JTMS low will shift the data
one stage towards the serial output at JTDO. A rising edge on JTCLK in the Exit1-IR state or the Exit2-
IR state with JTMS high will move the controller to the Update-IR state The falling edge of that same
JTCLK will latch the data in the instruction shift register to the instruction parallel output. Instructions
supported by the DS21Q42 with their respective operational binary codes are shown in Table 23-1.
1
0
1
11
1
11
1
00
0
1
0
1
0
Select
DR-Scan
Capture DR
Shift DR
Exit DR
Pause DR
Exit2 DR
Update DR
Select
IR-Scan
Capture IR
Shift IR
Exit IR
Pause IR
Exit2 IR
Update IR
Test Logic
Reset
Run Test/
Idle
0
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