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Rainbow Electronics DS2151Q User Manual

Page 10

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DS2151Q

022697 10/46

TLINK

TCR1.2

TLINK Select. (see note below)
0=source FDL or Fs bits from TFDL register
1=source FDL or Fs bits from the TLINK pin

TBL

TCR1.1

Transmit Blue Alarm. (see note below)
0=transmit data normally
1=transmit an unframed all one’s code at TPOS and TNEG

TYEL

TCR1.0

Transmit Yellow Alarm. (see note below)
0=do not transmit yellow alarm
1=transmit yellow alarm

Note: for a detailed description of how the bits in TCR1 affect the transmit side formatter of the DS2151Q, please see
Figure 13–9.

TCR2: TRANSMIT CONTROL REGISTER 2 (Address=36 Hex)

(MSB)

(LSB)

TEST1

TEST0

TZBTSI

TSDW

TSM

TSIO

TD4YM

B7ZS

SYMBOL

POSITION

NAME AND DESCRIPTION

TEST1

TCR2.7

Test Mode Bit 1 for Output Pins. See Table 3–1.

TEST0

TCR2.6

Test Mode Bit 0 for Output Pins. See Table 3–1.

TZBTSI

TCR2.5

Transmit Side ZBTSI Enable.
0=ZBTSI disabled
1=ZBTSI enabled

TSDW

TCR2.4

TSYNC Double–Wide. (note: this bit must be set to zero when TCR2.3=1
or when TCR2.2=0)
0=do not pulse double–wide in signaling frames
1=do pulse double–wide in signaling frames

TSM

TCR2.3

TSYNC Mode Select.
0=frame mode (see the timing in Section 13)
1=multiframe mode (see the timing in Section 13)

TSIO

TCR2.2

TSYNC I/O Select.
0=TSYNC is an input
1=TSYNC is an output

TD4YM

TCR2.1

Transmit Side D4 Yellow Alarm Select.
0=zeros in bit 2 of all channels
1=a one in the S–bit position of frame 12

B7ZS

TCR2.0

Bit 7 Zero Suppression Enable.
0=no stuffing occurs
1=Bit 7 force to a one in channels with all zeros

OUTPUT PIN TEST MODES Table 3–1

TEST1

TEST0

EFFECT ON OUTPUT PINS

0

0

operate normally

0

1

force all output pins 3–state (including all I/O pins and parallel port pins)

1

0

force all output pins low (including all I/O pins except parallel port pins)

1

1

force all output pins high (including all I/O pins except parallel port pins)