DS2155 datasheet(75/262 Pages) DALLAS

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DS2156

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11.

I/O PIN CONFIGURATION OPTIONS

IOCR1

I/O Configuration Register 1

01h

Bit #

Name

RSMS

RSMS2

RSMS1

RSIO

TSDW

TSM

TSIO

ODF

Default

Bit 0/Output Data Format (ODF)

0 = bipolar data at TPOSO and TNEGO

1 = NRZ data at TPOSO; TNEGO = 0

Bit 1/TSYNC I/O Select (TSIO)

0 = TSYNC is an input

1 = TSYNC is an output

Bit 2/TSYNC Mode Select (TSM). Selects frame or multiframe mode for the TSYNC pin. See the timing

diagrams in Section 34.

0 = frame mode

1 = multiframe mode

Bit 3/TSYNC Double-Wide (TSDW). (Note: This bit must be set to 0 when IOCR1.2 = 1 or when IOCR1.1 = 0.)

0 = do not pulse double-wide in signaling frames

1 = do pulse double-wide in signaling frames

Bit 4/RSYNC I/O Select (RSIO). (Note: This bit must be set to 0 when ESCR.0 = 0.)

0 = RSYNC is an output

1 = RSYNC is an input (only valid if elastic store enabled)

Bit 5/RSYNC Mode Select 1(RSMS1). Selects frame or multiframe pulse when RSYNC pin is in output mode. In

input mode (elastic store must be enabled), multiframe mode is only useful when receive signaling reinsertion is

enabled. See the timing diagrams in Section 34.

0 = frame mode

1 = multiframe mode

Bit 6/RSYNC Mode Select 2 (RSMS2)

T1 Mode: RSYNC pin must be programmed in the output frame mode (IOCR1.5 = 0, IOCR1.4 = 0).

0 = do not pulse double-wide in signaling frames

1 = do pulse double-wide in signaling frames

E1 Mode: RSYNC pin must be programmed in the output multiframe mode (IOCR1.5 = 1, IOCR1.4 = 0).

0 = RSYNC outputs CAS multiframe boundaries

1 = RSYNC outputs CRC4 multiframe boundaries

Bit 7/RSYNC Multiframe Skip Control (RSMS). Useful in framing format conversions from D4 to ESF. This

function is not available when the receive-side elastic store is enabled. RSYNC must be set to output multiframe

pulses (IOCR1.5 = 1 and IOCR1.4 = 0).

0 = RSYNC outputs a pulse at every multiframe

1 = RSYNC outputs a pulse at every other multiframe

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