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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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DS21FT44 Fiches technique(PDF) 62 Page - Dallas Semiconductor |
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DS21FT44 Fiches technique(HTML) 62 Page - Dallas Semiconductor |
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62 / 110 page  DS21FT44/DS21FF44 62 of 110 TSER pin via the clearing of the TCR1.3 bit. Please see the timing diagrams and the transmit data flow diagram in Section 22 for examples. 18.2. INTERNAL REGISTER SCHEME BASED ON DOUBLE–FRAME On the receive side, the RAF and RNAF registers will always report the data as it received in the Additional and International bit locations. The RAF and RNAF registers are updated with the setting of the Receive Align Frame bit in Status Register 2 (SR2.6). The host can use the SR2.6 bit to know when to read the RAF and RNAF registers. It has 250 us to retrieve the data before it is lost. On the transmit side, data is sampled from the TAF and TNAF registers with the setting of the Transmit Align Frame bit in Status Register 2 (SR2.3). The host can use the SR2.3 bit to know when to update the TAF and TNAF registers. It has 250 us to update the data or else the old data will be retransmitted. Data in the Si bit position will be overwritten if the framer is programmed: (1) to source the Si bits from the TSER pin, (2) in the CRC4 mode, or (3) have automatic E–bit insertion enabled. Data in the Sa bit position will be overwritten if any of the TCR2.3 to TCR2.7 bits are set to one (please see Section 18.1 for details). Please see the register descriptions for TCR1 and TCR2 and the Transmit Data Flow diagram in Section 18 for more details. RAF: RECEIVE ALIGN FRAME REGISTER (Address=2F Hex) (MSB) (LSB) Si 00 110 11 SYMBOL POSITION NAME AND DESCRIPTION Si RAF.7 International Bit. 0RAF.6 Frame Alignment Signal Bit. 0RAF.5 Frame Alignment Signal Bit. 1RAF.4 Frame Alignment Signal Bit. 1RAF.3 Frame Alignment Signal Bit. 0RAF.2 Frame Alignment Signal Bit. 1RAF.1 Frame Alignment Signal Bit 1RAF.0 Frame Alignment Signal Bit. RNAF: RECEIVE NON–ALIGN FRAME REGISTER (Address=1F Hex) (MSB) (LSB) Si 1 A Sa4 Sa5 Sa6 Sa7 Sa8 SYMBOL POSITION NAME AND DESCRIPTION Si RNAF.7 International Bit. 1 RNAF.6 Frame Non–Alignment Signal Bit. A RNAF.5 Remote Alarm. Sa4 RNAF.4 Additional Bit 4. Sa5 RNAF.3 Additional Bit 5. Sa6 RNAF.2 Additional Bit 6. Sa7 RNAF.1 Additional Bit 7. Sa8 RNAF.0 Additional Bit 8. |
Numéro de pièce similaire - DS21FT44 |
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Description similaire - DS21FT44 |
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