DS26521 datasheet(44/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

44 of 258

8.9.4

Signaling

The DS26521 supports both software- and hardware-based signaling. Interrupts can be generated on changes of

signaling data. The DS26521 is also equipped with receive-signaling freeze on loss of synchronization (OOF),

carrier loss, or change of frame alignment. The DS26521 also has hardware pins to indicate signaling freeze.

•

Flexible signaling support

Software or hardware based

Interrupt generated on change of signaling data

Receive-signaling freeze on loss of frame, loss of signal, or change of frame alignment

•

Hardware pins for carrier loss and signaling freeze indication

Table 8-11. Registers Related to Signaling

FRAMER

ADDRESSES

FUNCTION

Transmit-Signaling Registers 1 to 16

(TS1 to TS16)

140h to 14Bh (T1/J1)

140h to 14Fh (E1 CAS)

Transmit ABCD signaling.

Software-Signaling Insertion Enable

Registers 1 to 4 (SSIE1 to SSIE4)

118h, 119h, 11Ah, 11Bh

When enabled, signaling is inserted for

the channel.

Transmit Hardware-Signaling Channel

Select Registers 1 to 4

(THSCS1 to THSCS4)

1C8h, 1C9h, 1CAh, 1CBh

Bits determine which channels will have

signaling inserted in hardware-signaling

mode.

Receive-Signaling Control Register

(RSIGC)

013h

Freeze control for receive signaling.

Receive-Signaling All-Ones Insertion

Registers 1 to 3

(T1RSAOI1 to T1RSAOI3)

038h, 039h, 03Ah

Registers for all-ones insertion (T1 mode

only).

Receive-Signaling Registers 1 to 16

(RS1 to RS16)

040h to 04Bh (T1/J1)

040h to 04Fh (E1)

Receive-signaling bytes.

Receive-Signaling Status Registers 1

to 4 (RSS1 to RSS4)

098h to 09Ah (T1/J1)

98h to 9Fh (E1)

Receive-signaling change of status bits.

Receive-Signaling Change of State

Enable Registers 1 to 4 (RSCSE1 to

RSCSE4)

0A8h, 0A9h, 0AAh, 0ABh

Receive-signaling change of state

interrupt enable.

Receive Latched Status Register 4

(RLS4)

093h

Receive-signaling change of state bit.

Receive Interrupt Mask Register 4

(RIM4)

0A3h

Receive-signaling change of state

interrupt mask bit.

Receive-Signaling Reinsertion Enable

Registers 1 to 4 (RSI1 to RSI4)

0C8h, 0C9h, 0CAh, 0CBh

Registers for signaling reinsertion.

DS26521 Datasheet(PDF) 44 Page - Maxim Integrated Products

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