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IDT82V3011PV Datasheet(PDF) 9 Page - Integrated Device Technology |
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IDT82V3011PV Datasheet(HTML) 9 Page - Integrated Device Technology |
9 / 30 page 9 IDT82V3011 T1/E1/OC3 WAN PLL WITH SINGLE REFERENCE INPUT INDUSTRIAL TEMPERATURE RANGE 2 FUNCTIONAL DESCRIPTION The IDT82V3011 is a T1/E1/OC3 WAN PLL with single reference input, 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 IDT82V3011. 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 and TIE_en pins. The IDT82V3011 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 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) AutoT IE Dis able Auto TIE Disa ble Au to TIE Dis ab le Auto TIE Disa ble Reset * * Note: After reset, the Mode_sel1 and Mode_sel0 should be initially set to '10' or '00'. TIE Enable (TIE_en = H) Auto TIE Disable S2 Auto - Holdover Mode_sel1=0 Mode_sel0=0 (Valid Input Reference Signal) TIE Disable (TIE_en = L) |
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