DS26519G datasheet(39/310 Pages) MAXIM

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DS26519 16-Port T1/E1/J1 Transceiver

39 of 310

9.4

Initialization and Configuration

9.4.1

Example Device Initialization and Sequence

STEP 1: Reset the device by pulling the

RESETB pin low, applying power to the device, or by using the software

reset bits outlined in Section 9.2.2. Clear all reset bits. Allow time for the reset recovery.

STEP 2: Check the Device ID in the IDR register.

STEP 3: Write the GTCCR1 register to correctly configure the system clocks. If supplying a 1.544MHz MCLK

follows this write with at least a 300ns delay in order to allow the clock system to properly adjust.

STEP 4: Write the entire remainder of the register space for each port with 00h, including reserved register

locations.

STEP 5: Choose T1/J1 or E1 operation for the framers by configuring the T1/E1 bit in the TMMR and RMMR

registers for each framer. Set the FRM_EN bit to 1 in the TMMR and RMMR registers. If using software transmit

signaling in E1 mode, program the E1TAF and E1TNAF registers as required. Configure the framer Transmit

Control Registers (TCR1–TCR4). Configure the framer Receive Control Registers (RCR1–RCR3). Configure other

framer features as appropriate.

STEP 6: Choose T1/J1 or E1 operation for the LIUs by configuring the T1J1E1S bit in the LTRCR register.

Configure the line build-out for each LIU. Configure other LIU features as appropriate. Set the TE (transmit enable)

bit to turn on the TTIPn and TRINGn outputs.

STEP 7: Configure the elastic stores, HDLC controller, and BERT as needed.

STEP 8: Set the INIT_DONE bit in the TMMR and RMMR registers for each framer.

DS26519G Datasheet(PDF) 39 Page - Maxim Integrated Products