Achronix Speedster22i User Macro Guide Uživatelský manuál stáhnout pdf (Strana 26)

I/O Cells IOPAD_D2

Speedster Macro Cell Library

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IOPAD_D2

Bidirectional DDR I/O Pad with Asynchronous or Synchronous Set/

Reset

rstn

srstn

oerstn

douta

pad

Note: For Speedster22iHP, txdata_en and rxdata_en are shared.

For Speedster22iHD, txdata_en and rxdata_en may be driven separately.

IOPAD_D2

rstn

srstn

rstn

srstn

rstn

srstn

txclk

txrstn

dina

dinb

txdata_en

txclk

rxdata_en

rxrstn

srstn

rxclk

doutb

Figure 1-3: IOPAD_D2 Logic Symbol

IOPAD_D2 is aDoubl

eDataRate (DDR) I/Opadwith active‐highregisteredoutput enable.

Thereisanadditionalstageofregistersontheinputsandoutputstoallow thelogiclevelon

the pad tochangesonboth therisingandfalling edges of theclock,butallow the interface

signalstoandfromtheFP

GAcoretochangeontherisingedgeoftheclock. Thisadditional

levelofregistersprovidesafullcycletogetintoandoutoftheFPGAcore.

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Achronix Speedster22i User Macro Guide Uživatelský manuál Strana 26