DS26521 datasheet(134/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

134 of 258

RIOCR

Receive I/O Configuration Register

084h

Bit #

Name

RCLKINV

RSYNCINV

H100EN

RSCLKM

RSMS

RSIO

RSMS2

RSMS1

RCLKINV

RSYNCINV

H100EN

RSCLKM

—

RSIO

RSMS2

RSMS1

Default

Bit 7: RCLK Invert (RCLKINV).

0 = no inversion

1 = invert RCLK as input

Bit 6: RSYNC Invert (RSYNCINV).

0 = no inversion

1 = invert RSYNC as either input or output

Bit 5: H.100 SYNC Mode (H100EN). See Section 8.8.3 for more information.

0 = normal operation

1 = RSYNC and TSSYNCIO signals are shifted

Bit 4: RSYSCLK Mode Select (RSCLKM).

0 = if RSYSCLK is 1.544MHz

1 = if RSYSCLK is 2.048MHz or IBO enabled

Bit 3: RSYNC Multiframe Skip Control (RSMS) (T1 Mode Only). 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.

0 = RSYNC will output a pulse at every multiframe

1 = RSYNC will output a pulse at every other multiframe

Bit 2: RSYNC I/O Select (RSIO). (Note: This bit must be set to zero when elastic store is disabled) The default

value for this bit is a logic 1 so that the default state of RSYNC is as an input.

0 = RSYNC is an output

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

Bit 1: RSYNC Mode Select 2 (RSMS2).

T1 Mode: RSYNC pin must be programmed in the output frame mode.

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.

0 = RSYNC outputs CAS multiframe boundaries

1 = RSYNC outputs CRC-4 multiframe boundaries

In E1 mode, RSMS2 also selects which multiframe signal is available at the RMSYNC pin, regardless of the

configuration for RSYNC. When RSMS2 = 0, RMSYNC outputs CAS multiframe boundaries; when RSMS2 = 1,

RMSYNC outputs CRC-4 multiframe boundaries.

Bit 0: 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.

0 = frame mode

1 = multiframe mode

DS26521 Datasheet(PDF) 134 Page - Maxim Integrated Products

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