DS21448DK 데이터 시트보기 (PDF) - Maxim Integrated

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DS21448DK

3.3V E1/T1/J1 Line Interface Design Kit Daughter Card

Maxim Integrated 

DS21448DK 3.3V E1/T1/J1 Line Interface Design Kit

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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