
DS3105
87
Register Name:
T0CR1
Register Description:
T0 DPLL Configuration Register 1
Register Address:
65h
Bit #
7
6
5
4
3
2
1
0
Name
T4MT0
T4APT0
T0FT4[2:0]
T0FREQ[2:0]
Default
0
see below
Bit 7: T4 Measure T0 Phase (T4MT0). When this bit is set to 1 the T4 phase detector is configured to measure the
phase difference between the selected T0 DPLL input clock and the selected the T4 DPLL input clock. See Section
0 = T4 can lock to an input to measure frequency.
1 = Enable T4-measure-T0-phase mode.
Bit 6: T4 APLL Source from T0 (T4APT0). When this bit is set to 0,
T4CR1:T4FREQ configures the T4 APLL DFS
frequency. The T4 APLL DFS frequency affects the frequency of the T4 APLL, which, in turn, affects the available
output frequencies on the output clock pins (see the
OCR registers). When this bit is set to 1, the frequency of the
T4 APLL DFS is configured by the
T0CR1:T0FT4[2:0] field below. See Section
7.8.2.0 = T4 APLL frequency is determined by T4FREQ.
1 = T4 APLL frequency is determined by T0FT4.
Bits 5 to 3: T0 Frequency to T4 APLL (T0FT4[2:0]). When the T4APT0 bit is set to 1, this field specifies the
frequency of the T4 APLL DFS. This frequency can be different than the frequency specified by
T0CR1:T0FREQ.
T0FT4
T4 APLL DFS FREQUENCY
T4 APLL FREQUENCY (4 x T4 APLL DFS)
000 =
24.576MHz (12 x E1)
98.304MHz (48 x E1)
001 =
62.500MHz (GbE
÷ 16)
250.000MHz (GbE
÷ 4)
010 =
32.768MHz (16 x E1)
131.072MHz (64 x E1)
011 =
{unused value}
100 =
37.056MHz (24 x DS1)
148.224MHz (96 x DS1)
101 =
{unused value}
110 =
24.704MHz (16 x DS1)
98.816MHz (64 x DS1)
111 =
25.248MHz (4 x 6312kHz)
100.992MHz (16 x 6312kHz)
Bits 2 to 0: T0 DPLL Output Frequency (T0FREQ[2:0]). This field configures the T0 APLL DFS frequency. The
T0 APLL DFS frequency affects the frequency of the T0 APLL, which, in turn, affects the available output
frequencies on the output clock pins (see the
OCR registers). See Section
7.8.2. The default frequency is
controlled by the O6F[2:0] and O3F[2:0] pins as described in
Table 7-15.T0FREQ
T0 APLL DFS FREQUENCY
T0 APLL FREQUENCY (4 x T0 APLL DFS)
000 =
77.76MHz
311.04MHz (4 x 77.76MHz)
001 =
77.76MHz
311.04MHz (4 x 77.76MHz)
010 =
24.576MHz (12 x E1)
98.304MHz (48 x E1)
011 =
32.768MHz (16 x E1)
131.072MHz (64 x E1)
100 =
37.056MHz (24 x DS1)
148.224MHz (96 x DS1)
101 =
24.704MHz (16 x DS1)
98.816MHz (64 x DS1)
110 =
25.248MHz (4 x 6312kHz)
100.992MHz (16 x 6312kHz)
111 =
62.500MHz (GbE
÷ 16)
250.000MHz (GbE
÷ 4)