參數(shù)資料
型號: DS21FT44
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封裝: 27 X 27 MM, 1.27 MM PITCH, MCMBGA-300
文件頁數(shù): 106/117頁
文件大?。?/td> 691K
代理商: DS21FT44
DS21FT44/DS21FF44
89 of 117
21.4. TEST REGISTERS
IEEE 1149.1 requires a minimum of two test registers; the bypass register and the boundary scan register.
An optional test register has been included with the DS21Q44 design. This test register is the
identification register and is used in conjunction with the IDCODE instruction and the Test-Logic-Reset
state of the TAP controller.
Boundary Scan Register
This register contains both a shift register path and a latched parallel output for all control cells and
digital I/O cells and is 126 bits in length. able 21-3 shows all of the cell bit locations and definitions.
Bypass Register
This is a single 1-bit shift register used in conjunction with the BYPASS, CLAMP, and HIGH-Z
instructions, which provides a short path between JTDI and JTDO.
Identification Register
The identification register contains a 32-bit shift register and a 32 bit latched parallel output. This register
is selected during the IDCODE instruction and when the TAP controller is in the Test-Logic-Reset state.
相關(guān)PDF資料
PDF描述
DS21Q352 DATACOM, PCM TRANSCEIVER, PBGA256
DS21Q354 DATACOM, PCM TRANSCEIVER, PBGA256
DS21Q41BT DATACOM, FRAMER, PQFP128
DS21Q42TN DATACOM, FRAMER, PQFP128
DS21Q42T DATACOM, FRAMER, PQFP128
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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