DS2196 datasheet(32/157 Pages) DALLAS

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DS2196

32 of 157

TCR1A: TRANSMIT CONTROL REGISTER 1 FRAMER A (Address = 35 Hex)

(MSB)

(LSB)

LOTCMC

TFPT

TCPT

RBSE

GB7S

TFDLS

TBL

TYEL

SYMBOL

POSITION

NAME AND DESCRIPTION

LOTCMC

TCR1A.7

Loss Of Transmit Clock Mux Control. Determines whether

the transmit side of Formatter A should switch to MCLK if the

TCLK input should fail to transition (see Figure 1.1 for details).

0 = do not switch to MCLK if TCLKA stops

1 = switch to MCLK if TCLKA stops

TFPT

TCR1A.6

Transmit F–Bit Pass Through. (see note below)

0 = F bits sourced internally

1 = F bits sampled at TSERA

TCPT

TCR1A.5

Transmit CRC Pass Through. (see note below)

0 = source CRC6 bits internally

1 = CRC6 bits sampled at TSERA during F–bit time

RBSE

TCR1A.4

Robbed Bit Signaling Enable. (see note below)

0 = no signaling is inserted in any channel

1 = signaling is inserted in all channels (the TTR registers can

be used to block insertion on a channel by channel basis)

GB7S

TCR1A.3

Global Bit 7 Stuffing. (see note below)

0 = allow the TTR registers to determine which channels

containing all 0’s are to be Bit 7 stuffed

1 = force Bit 7 stuffing in all zero byte channels regardless of

how the TTR registers are programmed

TFDLS

TCR1A.2

TFDL Register Select. (see note below)

0 = source FDL or Fs bits from the internal TFDL register

(legacy FDL support mode)

1 = source FDL or Fs bits from the internal HDLC/BOC

controller or the TLINKA pin

TBL

TCR1A.1

Transmit Blue Alarm. (see note below)

0 = transmit data normally

1 = transmit an unframed all 1’s code at TPOSOA and

TNEGOA

TYEL

TCR1A.0

Transmit Yellow Alarm. (see note below)

0 = do not transmit yellow alarm

1 = transmit yellow alarm

NOTE:

For a description of how the bits in TCR1A affect the transmit side formatter, see Figure 21-7.

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