DS3172 datasheet(140/232 Pages) DALLAS

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DS3171/DS3172/DS3173/DS3174

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Bit 4: LOOP Time Enable (LOOPT). When this bit is set, the port is in loop time mode. The transmit clock is set to

the receive clock from the RLCLKn pin or the recovered clock from the LIU or the CLAD clock and the TCLKIn pin

is not used. This function of this bit is conditional on other control bits. See Table 10-4 for more details.

0 = Normal transmit clock operation

1 = Transmit using the receive clock

Bit 3: CLAD Transmit Clock Source Control (CLADC). This bit is used to enable the CLAD clocks as the source

of the internal transmit clock. This function of this bit is conditional on other control bits. See Table 10-4 for more

details.

0 = Use CLAD clocks for the transmit clock as appropriate

1 = Do not use CLAD clocks for the transmit clock – (if no loopback is enabled, TCLKIn is the source)

Bit 2: Receive Framer IO Signal Timing Select (RFTS). This bit controls the timing reference for the signals on

the receive framer interface IO pins. The pins controlled are RSERn, RSOFOn / RDENn. See Table 10-8 for more

details.

0 = Use output clocks for timing reference

1 = Use input clocks for timing reference

Bit 1: Transmit Framer IO Signal Timing Select (TFTS). This bit controls the timing reference for the signals on

the transmit framer interface IO pins. The pins controlled are TSOFIn, TSERn, and TSOFOn / TDENn. See Table

10-7 for more details.

0 = Use output clocks for timing reference

1 = Use input clocks for timing reference

Bit 0: Transmit Line IO Signal Timing Select (TLTS). This bit controls the timing reference for the signals on the

transmit line interface IO pins. The pins controlled are TPOSn / TDATn and TNEGn. See Table 10-6 for more

details.

0 = Use output clocks for timing reference

1 = Use input clocks for timing reference

PORT.CR4

Port Control Register 4

(0,2,4,6)46h

Bit #

Name

RESERVED

LBM2

LBM1

LBM0

Default

Bit #

Name

GPIOB3

GPIOB2

GPIOB1

GPIOB0

GPIOA3

GPIOA2

GPIOA1

GPIOA0

Default

Bits 10 to 8: Loopback Mode [2:0] (LBM[2:0]). These bits select the loopback modes for analog loopback (ALB),

line loopback (LLB), payload loopback (PLB) and diagnostic loopback (DLB). See Table 10-17 for the loopback

select codes. Default: No Loopback.

LBM[2:0]

ALB

LLB

PLB

DLB

000

001

010

011

10X

110

111

DS3172 Datasheet(PDF) 140 Page - Dallas Semiconductor

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