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IS22C022P Datasheet(PDF) 2 Page - Integrated Silicon Solution, Inc |
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IS22C022P Datasheet(HTML) 2 Page - Integrated Silicon Solution, Inc |
2 / 11 page 2 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 11/15/99 IS22C022 ISSI® Group Configuration Voice within each group are combinations of different fixed memory sections of up to 126 sections. These sections are the fundamental voice building blocks for arranging playback without limiting sequencing. This provides flexibility and allows data to be re-used, beneficial for applications with many repeated sounds or words. An example of group configuration is illustrated below: Group No. Section Entry Group 1 Sec 1 + Sec 2 + Sec 3 ……. Sec 109 Group 2 Sec 3 + Sec 2 Group 3 Sec 10 + Sec 11 + Sec 12 Group 4 Sec110 + Sec 10 + Sec 5 Group Configuration The entry of sections for each group is truly random and without limitation. However, there is a limit in the total number of entries for eight groups, which is 992 in the IS22C022. It is acceptable to allocate all entries into only one group or distribute out to other groups. It depends on how many groups of messages are required. Programmable Options Groups in IS22C022 can have independent options. They include: • Edge or Level trigger • Unholdable or Holdable trigger • Retriggerable or non-retriggerable • Sequential or Random playback • LED1, LED2, Busy, and Stop pulse are configurable • Four selections in playback frequency Selections in Triggering The IS22C022 can be triggered in different ways, Edge or Level trigger, Holdable or Unholdable, Retriggerable or Non-retriggerable. The combinations of the triggering options provide versatile playback. By enabling Retrigger, the playback can be controlled in Stop and Start mode. A trigger on any trigger pin will stop the current message and start the next message immedi- ately. Selections in Playback Frequency This option provides four choices for each group in frequency which implies it is possible to have four different sampling rates in one chip or one sample rate with a different playback frequency. As a matter of fact, the available choices are also dependent on the pullup resistor value at the OSC pin. For example, if the fundamental frequency choice is F, it can provide choices in x1, x1-1/2, x2, x3. Selections in Playback Mode There are two playback modes, Sequential and Random in the IS22C022. If the chip is programmed in Sequential Mode, messages will playback in the order from Group 1 to Group 8 by triggering the SBT pin. If the chip is programmed in Random Mode, messages will be played back randomly by triggering the SBT pin. Selections in Output Buffer There are three independent output pins, OUT1, OUT2, and OUT3, available for several combinations of LED1, LED2, Stop Pulse, and Busy Signal for each group. The following table illustrates the four different combinations. OUT1 OUT2 OUT3 1. LED1 LED2 Busy 2. STOP LED1 LED2 3. Busy Stop LED1 4. LED2 Busy Stop LED1 and LED2 are complemented outputs flashing at approximately a 3 Hz rate. Stop pulse (STOP) gives a 15 ms positive pulse at the end of the playback for each Group with option have or do not have the Stop pulse. Busy is active high and Section dependent but not Group dependent. Even if same section in different group may have different output in Busy output. For instance, BUSY can be high for Section 4 in Group 1 but low in Group 4. BUSY can be used as a synchronous signal. During standby mode all three outputs must be low. Software Support ISSI provides dedicated software to the customer. With this tool, the customer can compose their own messages and configure the chip to fit into their applications very easily. |
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