AS3524 datasheet(79/124 Pages) AMSCO

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AS3524 C21 / C22

austriamicrosystems

Data Sheet, Confidential

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Revision 1.11

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Timing Parameters

Also the time points for change from p0-p1 (t1) and p1-p2 (t2) can be programmed. For these programmable timing parameters each data output

cycle is divided into 32 steps. Both T1 and T2 can be in the range of 0 to 31. For short count bit set (sdc bit in control register), T1 and T2 must be

in the range of 0 to 15.

Figure 33 DBOP timing parameters

Tperiod

P0, P1, P2 = 0,1,0; T1=6, T2=10

P0, P1, P2 = 1,0,1; T1=14, T2=28

P0, P1, P2 = 0,0,1; T1<21, T2=21

dout

dinStrobe; TS = 24

Even/odd generated signals

In addition to these timing parameters, signals can also be programmed to go active only during the even (0, 2, 4, …) or the odd cycles (1, 3, 5, …).

For example the indication of even/odd bytes for the case that two bytes in serial are transmitted can be used.

Two control bits are used to set this signal behaviour:

evenEnable, oddEnable. For default, both are set to 1 and both cycles will appear. For cases where even or odd should be omitted, set according

evenEnable/oddEnable to 0. With both set to 0, no cycles will appear at the output!

Following example illustrates a typical waveform for an output interface where the evenEnable=0 and oddEnable=1 for control signal C2. In this

example, C2 is an active high indication of the high byte (D1, D3, D5, …).

Figure 34 DBOP even/odd generated signals waveforms

quiescent state

C0 = write

C1 = enable

C2 = high byte

dout

C3 = chip select

even

odd

even

odd

even

odd

Normally the even/odd cycles are toggling all the time, also if there are quiescent states in between. To have the possibility of defining a new start,

reset of this even/odd counter can be done via the res_even bit inside of the control register. With res_even set, the counter starts with an even

cycle. Res_even is then set to 0 again by SW at the new start.

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