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KS8701 Datasheet(PDF) 62 Page - Samsung semiconductor |
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KS8701 Datasheet(HTML) 62 Page - Samsung semiconductor |
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62 / 73 page  KS8701 Appendix A: Application Notes FLEX TM Roaming Decoder II 61 BUILDING A FRAGMENTED MESSAGE The longest message which will fit into a frame is 84 code words total of message data. Three alpha characters per word yields a maximum message of 252 characters in a frame assuming no other traffic. Messages longer than this value must be sent as several fragments. Additional fragments can be expected when the “continue bit” in the 1 st Message Word is set. This causes the pager to examine every following frame for an additional fragment until the last fragment with the continue bit reset is found. The only requirement relating to the placement in time of the remaining fragments is that no more than 32 frames (1 minute) or 128 frames (4 minutes) as indicated by the service provider may pass between fragment receptions. Each fragment contains a check sum character to detect errors in the fragment, a fragment number 0, 1, or 2 to detect missing fragments, a message number to identify which message the fragment is a part, and the continue bit which either indicates that more fragments are in queue or that the last fragment has been received. The following describes the sequence of events between the Host and the KS8701 required to handle a fragmented message: l The host will receive a vector indicating one of the following types: V 2V1V0 Type 000 Secure 101 Alphanumeric 110 Hex / Binary l The KS8701 will increment the all frame mode counter inside the KS8701 and begin to decode all of the following frames. l The host will receive the Message Packet(s) contained within that frame followed by a Status Packet. The host must decide based on the Message Packet to return to normal decoding operation. If the message is indicated as fragmented by the Message Continued Flag “C” being set in the Message Packet then the host does not decrement the all frame mode counter at this time. The host decrements the counter if the Message Continued Flag “C” is clear by writing the All Frame Mode Packet to the KS8701 with the “DAF” bit = 1. If no other fragments, temporary addresses are pending and the FAF bit is clear in the All Frame Mode Register, then the KS8701 returns to normal operation. l The KS8701 continues to decode all of the frames and passes any address information, vector information and message information to the host followed by a status packet indicating the end of the frame. If the message is indicated as fragmented by the Message Continued Flag “C” in the Message Packet then the host remains in the receive mode expecting more information from the KS8701. l After the host receives the second and subsequent fragment with the Message Continued Flag “C” = 1, it should decrement the all frame mode counter by sending an All Frame Mode Packet to the KS8701 with the “DAF” bit = 1. Alternatively, the host may choose to decrement the counter at the end of the entire message by decrementing the counter once for each fragment received. |
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