DS26521 datasheet(128/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

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Sa6CODE

Received Sa6 Codeword Register

06Fh

Bit #

Name

—

Sa6n

Default

This register reports the received Sa6 codeword per ETS 300 233. The bits are monitored on a submultiframe

asynchronous basis, so the pattern reported could be one of multiple patterns that would represent a valid

codeword. The table below indicates which patterns reported in this register correspond to a given valid Sa6

codeword.

Bits 3 to 0: Sa6 Codeword Bit (Sa6n).

VALID Sa6 CODE

POSSIBLE REPORTED

PATTERNS

Sa6_8

1000, 0100, 0010, 0001

Sa6_A

1010, 0101

Sa6_C

110, 0110, 0011, 1001

Sa6_E

1110, 0111, 1011, 1101

Sa6_F

1111

RMMR

Receive Master Mode Register

080h

Bit #

Name

FRM_EN

INIT_DONE

—

SFTRST

T1/E1

Default

Bit 7: Framer Enable (FRM_EN). This bit must be set to the desired state before writing INIT_DONE.

0 = Framer disabled—held in low-power state

1 = Framer enabled—all features active

Bit 6: Initialization Done (INIT_DONE). The user must set this bit once he has written the configuration registers.

The host is required to write or clear all device registers prior to setting this bit. Once INIT_DONE is set, the

DS26521 will check the FRM_EN bit and, if enabled, will begin operation based on the initial configuration.

Bit 1: Soft Reset (SFTRST). Level sensitive soft reset. Should be taken high then low to reset the receiver.

0 = Normal operation

1 = Reset the receiver

Bit 0: Receiver T1/E1 Mode Select (T1/E1). Sets operating mode for receiver only! This bit must be set to the

desired state before writing INIT_DONE.

0 = T1 operation

1 = E1 operation

DS26521 Datasheet(PDF) 128 Page - Maxim Integrated Products

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