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NM95HS02EM Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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NM95HS02EM Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 20 page  Data Frame Fields (Continued) The preamble has a fixed format of two bit times at system logic high then one-bit time at system logic low then eight zeroes using the user-selected bit coding format This ar- rangement is clearly shown in Figure 6 for several bit coding formats If desired a preamble may be isolated from the frame by eight-bit times at logic low during a frame transmission This can be achieved by enabling the sync field in NRZ mode with the byte 0h SYNC FIELD If enabled the sync field is transmitted in every normal data frame or sync frame to provide a bit timing reference for the rest of the frame This allows the decoder to determine the proper bit coding format the generator is using and to syn- chronize to it The sync field option is set with the SyncPresent bit in the EEPROM array If SyncPresent e 0 no sync field is sent If SyncPresent e 1 an 8-bit sync field is included in the data transmission This 8-bit field is transmitted Most Significant Bit first The sync field data is programmable and can be encoded with any user-selected bit coding format or with an NRZ (unencoded binary) bit format The option to select between a user bit coding format and NRZ format is set by configur- ing the SyncType bit in the EEPROM array If SyncType e 0 sync field data is sent according to the user-selected IR or RF bit coding format If SyncType e 1 the information is sent in NRZ format with the bit length determined by the chosen IR or RF bit coding format For NRZ bit coding both high and low bit times are the same as the IR or RF bit coding time For bit coding modes where the ‘‘1’’s and ‘‘0’’s have different bit lengths all IR modes for example the length of the NRZ ‘‘1’’ and ‘‘0’’ bits have correspondingly different bit lengths RF bit coding format 7 is a special case As in the other formats if SyncType e 0 information is sent according to the user-set IR or RF bit coding format However if Sync- Type e 1 a ‘‘0’’ is sent using the bit coding determined by the IR or RF coding format and a ‘‘1’’ is sent as an NRZ zero This is to maintain the ‘‘spirit’’ of the low duty cycle arrangement for RF format 7 Figure 7 shows sync field examples for several bit coding formats TLD12302 – 17 FIGURE 6 Preamble Format Examples TLD12302 – 18 FIGURE 7 Sync Field ExampIes for Data Byte 03h http www nationalcom 8 |
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