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82V3012PVG Datasheet(PDF) 10 Page - Renesas Technology Corp |
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82V3012PVG Datasheet(HTML) 10 Page - Renesas Technology Corp |
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10 / 33 page  Functional Description 10 February 6, 2009 IDT82V3012 T1/E1/OC3 WAN PLL WITH DUAL REFERENCE INPUTS 2 FUNCTIONAL DESCRIPTION The IDT82V3012 is a T1/E1/OC3 WAN PLL with dual reference inputs, providing timing (clock) and synchronization (framing) signals to interface circuits for multitrunk T1/E1 and STS3/OC3 links. The details are described in the following sections. 2.1 STATE CONTROL CIRCUIT The State Control Circuit is an important part in the IDT82V3012. It is used to control the TIE block and the DPLL block as shown in Figure - 2. The control is based on the result of Invalid Input Signal Detection and the logic levels on the MODE_sel0, MODE_sel1, IN_sel and TIE_en pins. The IDT82V3012 can be operated in three different modes: Normal, Holdover and Freerun. The operating mode is selected by the MODE_sel1 and MODE_sel0 pins, as shown in Table - 1. Figure - 3 shows the state control diagram. All state changes occur synchronously on the rising edge of F8o. Three operating modes, Normal (S1), Holdover (S3) and Freerun (S0) can be switched from one to another by changing the logic levels on the MODE_sel0 and MODE_sel1 pins. Figure - 2 State Control Circuit Figure - 3 State Control Diagram Table - 1 Operating Modes Selection Mode Selection Pins Operating Mode MODE_sel1 MODE_sel0 00 Normal 0 1 Holdover 1 0 Freerun 11 Reserved State Control Circuit MODE_sel1 MODE_sel0 TIE_en Output of the Invalid Input Signal Detection F8o TIE Block Enable/Disable DPLL Block Mode Control IN_sel S1 Normal Mode_sel1 = 0 Mode_sel0 = 0 S3 Holdover Mode_sel1 = 0 Mode_sel0 = 1 S0 Freerun Mode_sel1 = 1 Mode_sel0 = 0 (Invalid Input Reference Signal) (Valid Input Reference Signal) Aut o T IE D isab le Aut o T IE D isab le TIE Enable (TIE_en = H) AutoT IE Dis able AutoTIE Disable Au to TIE Dis ab le TIE Disa ble (TIE _en = L) AutoT IE Dis able TIE E nable (TIE_ en = H) Reset * S4 Short Time Holdover Mode_sel1 = 0 Mode_sel0 = 0 No IN _sel T ransie nt TIE E nable (TIE_ en = H) IN_s el Tra nsien t Auto TIE D isable S2 Auto - Holdover Mode_sel1 = 0 Mode_sel0 = 0 * Note: After reset, the Mode_sel1 and Mode_sel0 should be initially set to '10' or '00'. Auto TIE Disable (Valid Input Reference Signal) TIE Disable (TIE_en = L) |
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