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PEB2080 Datasheet(PDF) 42 Page - Siemens Semiconductor Group |
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PEB2080 Datasheet(HTML) 42 Page - Siemens Semiconductor Group |
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42 / 73 page  Semiconductor Group 43 Operational Description TE / LT-T Mode F3 power down This is the deactivated state of the physical protocol.The receive line awake unit is active except during a RST pulse. Clocks are disabled if ENCK = 1 (TE mode). The power consumption in this state is approximately 22 mW when the clock is running, and 4 mW otherwise. F3 power up This state is identical to “F3 power down”, except for the C/l output message. The state is invoked by a C/l command TIM = “0000” (or SDI static low). After the subsequent activation of the clocks the PU message is outputted. This occurs 0,5 ms to 4 ms after application of TIM, depending on crystal capacitances. If, however, the SBC is disconnected from the S interface (CON = 0), the C/l message DIS is outputted. F3 pend. deact. The SBC reaches this state after receiving INFO0 (from states F5 to F8) for 16 ms (64 frames). This time constant is a “flywheel” to prevent accidental deactivation. From this state an activation is only possible from the line (transition “F3 pend. deact.” to “F5 unsynchronized”). A power down state may be reached only after receiving DIU. F4 pend. act. Activation has been requested from the terminal, INFO1 is transmitted, INFO0 is still received, “Power Up” is transmitted in the C/l channel. This state is stable: timer T3 (I.430) is to be implemented in software. F5 unsynchronized At the reception of any signal from the NT, the SBC ceases to transmit INFO1 and awaits identification of INFO2 or INFO4. This state is reached at most 50 s after a signal different from INFO0 is present at the receiver of the SBC. F6 synchronized When the SBC receives an activation signal (INFO2), it responds with INFO3 and waits for normal frames (INFO4). This state is reached at most 6 ms after an INFO2 arrives at the SBC (when the oscillator was disabled in “F3 power down”). F7 activated This is the normal active state with the layer-1 protocol activated in both directions. From state “F6 synchronized”, state F7 is reached at most 0,5 ms after reception of INFO4. From state “F3 power down” with the oscillator disabled, state F7 is reached at most 6 ms after the SBC is directly activated by INFO4. F8 lost framing This is the condition where SBC has lost frame synchronization and is awaiting re-synchronization by INFO2 or INFO4 or deactivation by INFO0. |
Similar Part No. - PEB2080 |
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Similar Description - PEB2080 |
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