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PCIMX258CJM4A Datasheet(PDF) 108 Page - Freescale Semiconductor, Inc |
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PCIMX258CJM4A Datasheet(HTML) 108 Page - Freescale Semiconductor, Inc |
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108 / 144 page  i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3 108 Freescale Semiconductor Note: • All the timings for the SSI are given for a non-inverted serial clock polarity (TSCKP/RSCKP = 0) and a non-inverted frame sync (TFSI/RFSI = 0). If the polarity of the clock and/or the frame sync have been inverted, all the timing remains valid by inverting the clock signal STCK/SRCK and/or the frame sync STFS/SRFS shown in the tables figures. • All timings are on pads when SSI is being used for data transfer. • ”Tx” and “Rx” refer, respectively, to the transmit and receive sections of the SSI. • For internal frame sync operation using external clock, the FS timing is the same as that of Tx data (for example, during AC97 mode of operation). Table 81. SSI Transmitter Timing with External Clock ID Parameter Min. Max. Unit External Clock Operation SS22 (Tx/Rx) CK clock period 81.4 — ns SS23 (Tx/Rx) CK clock high period 36.0 — ns SS24 (Tx/Rx) CK clock rise time — 6.0 ns SS25 (Tx/Rx) CK clock low period 36.0 — ns SS26 (Tx/Rx) CK clock fall time — 6.0 ns SS27 FS (bl) low/ high setup before (Tx) CK falling –10.0 15.0 ns SS29 FS (bl) low/ high setup before (Tx) CK falling 10.0 — ns SS31 FS (wl) low/ high setup before (Tx) CK falling –10.0 15.0 ns SS33 FS (wl) low/ high setup before (Tx) CK falling 10.0 — ns SS37 (Tx) CK high to STXD valid from high impedance — 15.0 ns SS38 (Tx) CK high to STXD high/low — 15.0 ns SS39 (Tx) CK high to STXD high impedance — 15.0 ns Synchronous External Clock Operation SS44 SRXD setup before (Tx) CK falling 10.0 — ns SS45 SRXD hold after (Tx) CK falling 2.0 — ns SS46 SRXD rise/fall time — 6.0 ns |
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