DS2143 datasheet(30/44 Pages) DALLAS

30 / 44 page

DS2143/DS2143Q

30 of 44

TNAF: TRANSMIT NON-ALIGN FRAME REGISTER (Address=21 Hex)

(MSB)

(LSB)

Sa4

Sa5

Sa6

Sa7

Sa8

SYMBOL

POSITION

NAME AND DESCRIPTION

TNAF.7

International Bit.

TNAF.6

Frame Non-Alignment Signal Bit.

TNAF.5

Remote Alarm.

Sa4

TNAF.4

Additional Bit 4.

Sa5

TNAF.3

Additional Bit 5.

Sa6

TNAF.2

Additional Bit 6.

Sa7

TNAF.1

Additional Bit 7.

Sa8

TNAF.0

Additional Bit 8.

12.0 LINE INTERFACE CONTROL FUNCTION

The DS2143 can control line interface units that contain serial ports. When Control Register Bytes 1 or 2

(CRB1, CRB2) are written to, the DS2143 will automatically write this data serially (LSB first) into the

line interface by creating a chip select, serial clock and serial data via the LI_ CS , LI_SCLK and LI_SDI

pins respectively. This control function is driven off of the RCLK and it must be present for proper

operation. Registers CRB1 and CRB2 can only be written to, they cannot be read from. Writes to these

registers must be at least 20

µs apart. See Section 13 for timing information.

CRB1: CONTROL REGISTER BYTE 1 (Address=18 Hex)

CRB2: CONTROL REGISTER BYTE 2 (Address=19 Hex)

(MSB)

(LSB)

CR7

CR6

CR5

CR4

CR3

CR2

CR1

CR0

CRB1

CR7

CR6

CR5

CR4

CR3

CR2

CR1

CR0

CRB2

SYMBOL

POSITION

NAME AND DESCRIPTION

CR1

CRB1.0

LSB of Control Register Byte 1.

CR7

CRB2.7

MSB of Control Register Byte 2.

DS2143 Datasheet(PDF) 30 Page - Dallas Semiconductor

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