Datenblatt-Suchmaschine für elektronische Bauteile |
|
SN74ABT18502PM Datenblatt(PDF) 7 Page - Texas Instruments |
|
|
SN74ABT18502PM Datenblatt(HTML) 7 Page - Texas Instruments |
7 / 30 page SN74ABT18502 SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER SCBS753 – FEBRUARY 2002 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Exit1-DR, Exit2-DR The Exit1-DR and Exit2-DR states are temporary states used to end a DR scan. It is possible to return to the Shift-DR state from either Exit1-DR or Exit2-DR without recapturing the DR. On the first falling edge of TCK after entry to Exit1-DR, TDO goes from the active state to the high-impedance state. Pause-DR No specific function is performed in the stable Pause-DR state, in which the TAP controller can remain indefinitely. The Pause-DR state provides the capability of suspending and resuming DR scan operations without loss of data. Update-DR If the current instruction calls for the selected DR to be updated with current data, such update occurs on the falling edge of TCK following entry to the Update-DR state. Capture-IR When an IR scan is selected, the TAP controller must pass through the Capture-IR state. In the Capture-IR state, the IR captures its current status value. This capture operation occurs on the rising edge of TCK, upon which the TAP controller exits the Capture-IR state. For the SN74ABT18502, the status value loaded in the Capture-IR state is the fixed binary value 10000001. Shift-IR Upon entry to the Shift-IR state, the IR is placed in the scan path between TDI and TDO and, on the first falling edge of TCK, TDO goes from the high-impedance state to an active state. TDO enables to the logic level present in the LSB of the IR. While in the stable Shift-IR state, instruction data is serially shifted through the IR on each TCK cycle. The first shift occurs on the first rising edge of TCK after entry to the Shift-IR state (i.e., no shifting occurs during the TCK cycle in which the TAP controller changes from Capture-IR to Shift-IR or from Exit2-IR to Shift-IR). The last shift occurs on the rising edge of TCK upon which the TAP controller exits the Shift-IR state. Exit1-IR, Exit2-IR The Exit1-IR and Exit2-IR states are temporary states used to end an IR scan. It is possible to return to the Shift-IR state from either Exit1-IR or Exit2-IR without recapturing the IR. On the first falling edge of TCK after entry to Exit1-IR, TDO goes from the active state to the high-impedance state. Pause-IR No specific function is performed in the stable Pause-IR state, in which the TAP controller can remain indefinitely. The Pause-IR state provides the capability of suspending and resuming IR scan operations without loss of data. Update-IR The current instruction is updated and takes effect on the falling edge of TCK following entry to the Update-IR state. |
Ähnliche Teilenummer - SN74ABT18502PM |
|
Ähnliche Beschreibung - SN74ABT18502PM |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |