Datasheet

DS26521 Single T1/E1/J1 Transceiver
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Register Name:
TMMR
Register Description:
Transmit Master Mode Register
Register Address:
180h
Bit # 7 6 5 4 3 2 1 0
Name
FRM_EN INIT_DONE — — — — SFTRST T1/E1
Default 0 0 0 0 0 0 0 0
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 transceiver.
0 = Normal operation
1 = Reset the transceiver
Bit 0: Transmitter T1/E1 Mode Select (T1/E1). Sets operating mode for transmitter only! This bit must be written
with the desired value prior to setting INIT_DONE.
0 = T1 operation
1 = E1 operation