Instruction Manual

DS26503 T1/E1/J1 BITS Element
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Bit 3-4/Transmit PLL Input Frequency Select (TPLLIFS[1:0]). These bits are used to indicate the reference frequency
being input to the TX PLL.
TPLLIFS1 TPLLIFS0 Input Frequency
0 0 1.544MHz
0 1 2.048MHz
1 0 —
1 1 6312kHz
Bit 5/ PLL_OUT Select (PLLOS). This bit selects the source for the PLL_OUT pin. See Figure 3-3
.
0 = PLL_OUT is sourced directly from the TX PLL.
1 = PLL_OUT is the output of the TX PLL mux.
Bit 6-7/Transmit PLL Output Frequency Select (TPLLOFS[1:0]). These bits are used to select the TX PLL output
frequency.
TPLLOFS1 TPLLOFS0 Output Frequency
0 0 1.544MHz
0 1 2.048MHz
1 0 —
1 1 6312kHz