DS21Q348DK 3.3V E1/T1/J1 Line Interface Design Kit Daughter Card
Control Registers
The control registers are used set the clock frequency on the MCLK and TCLK pins. Options are 1.544MHz,
2.048MHz, external source (through AUX CLK BNC), and tri-state.
MCLK_SRC: MCLK SOURCE (OFFSET = 0x0011) INITIAL VALUE = 0x1
(MSB)
(LSB)
HI_Z
EXTOSC
2048MHZ
1544MHZ
NAME
HI_Z
EXTOSC
2048MHZ
1544MHZ
POSITION
MCLK_SRC.3
MCLK_SRC.2
MCLK_SRC.1
MCLK_SRC.0
FUNCTION
1 = Tri-state MCLK.
1 = Connect MCLK to the external oscillator.
1 = Connect MCLK to the 2.048MHz clock.
1 = Connect MCLK to the 1.544MHz clock.
TCLK1_SRC: TCLK SOURCE (OFFSET = 0x0012) INITIAL VALUE = 0x1
(MSB)
(LSB)
HI_Z
EXTOSC
2048MHZ
1544MHZ
NAME
HI_Z
EXTOSC
2048MHZ
1544MHZ
POSITION
TCLK1_SRC.3
TCLK1_SRC.2
TCLK1_SRC.1
TCLK1_SRC.0
FUNCTION
1 = Tri-state TCLK1.
1 = Connect TCLK1 to the external oscillator.
1 = Connect TCLK1 to the 2.048MHz clock.
1 = Connect TCLK1 to the 1.544MHz clock.
TCLK2_SRC: TCLK SOURCE (OFFSET = 0x0013) INITIAL VALUE = 0x1
(MSB)
(LSB)
HI_Z
EXTOSC
2048MHZ
1544MHZ
NAME
HI_Z
EXTOSC
2048MHZ
1544MHZ
POSITION
TCLK2_SRC.3
TCLK2_SRC.2
TCLK2_SRC.1
TCLK2_SRC.0
FUNCTION
1 = Tri-state TCLK2.
1 = Connect TCLK2 to the external oscillator.
1 = Connect TCLK2 to the 2.048MHz clock.
1 = Connect TCLK2 to the 1.544MHz clock.
TCLK3_SRC: TCLK SOURCE (OFFSET = 0x0014) INITIAL VALUE = 0x1
(MSB)
(LSB)
HI_Z
EXTOSC
2048MHZ
1544MHZ
NAME
HI_Z
EXTOSC
2048MHZ
1544MHZ
POSITION
TCLK3_SRC.3
TCLK3_SRC.2
TCLK3_SRC.1
TCLK3_SRC.0
FUNCTION
1 = Tri-state TCLK3.
1 = Connect TCLK3 to the external oscillator.
1 = Connect TCLK3 to the 2.048MHz clock.
1 = Connect TCLK3 to the 1.544MHz clock.
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