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XRT75R12IB Datasheet(PDF) 50 Page - Exar Corporation |
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XRT75R12IB Datasheet(HTML) 50 Page - Exar Corporation |
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50 / 90 page  XRT75R12 47 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. 1.0.4 5. After the µP toggles the Write signal "Low", the LIU will toggle the RDY output pin "Low". The LIU does this to inform the µP that the data has been written into the internal register location, and that it is ready for the next command. 6. The CS input pin must be pulled "High" before a new command can be issued. FIGURE 35. ASYNCHRONOUS µP INTERFACE SIGNALS DURING PROGRAMMED I/O READ AND WRITE OPERATIONS TABLE 15: ASYNCHRONOUS TIMING SPECIFICATIONS SYMBOL PARAMETER MIN MAX UNITS t0 Valid Address to CS Falling Edge 0 - ns t1 CS Falling Edge to RD Assert 0 - ns t2 RD Assert to RDY Assert - 65 ns NA RD Pulse Width (t2) 70 - ns t3 CS Falling Edge to WR Assert 0 - ns t4 WR Assert to RDY Assert - 65 ns NA WR Pulse Width (t4) 70 - ns CS Addr[7:0] D[7:0] RD WR RDY Valid Data for Readback Data Available to Write Into the LIU READ OPERATION WRITE OPERATION t 0 t 0 t 1 t 4 t 2 t 3 Valid Address Valid Address |
Similar Part No. - XRT75R12IB |
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