DS2155 T1/E1/J1

DS215510. T1 FRAMER/FORMATTER CONTROL REGISTERSThe T1 framer portion of the DS2155 is configured via a set of nine control registers. Typically, thecontrol registers are only accessed when the system is first powered up. Once the DS2155 has beeninitialized, the control registers will only need to be accessed when there is a change in the systemconfiguration. There are two receive-control registers (T1RCR1 and T1RCR2), two transmit controlregisters (T1TCR1 and T1TCR2), and a common control register (T1CCR1). Each of these registers isdescribed in this section.10.1 T1 Control RegistersRegister Name:T1RCR1Register Description: T1 Receive Control Register 1Register Address: 03hBit # 7 6 5 4 3 2 1 0Name - ARC OOF1 OOF2 SYNCC SYNCT SYNCE RESYNCDefault 0 0 0 0 0 0 0 0Bit 0/Resynchronize (RESYNC). When toggled from low to high, a resynchronization of the receive side framer is initiated.Must be cleared and set again for a subsequent resync.Bit 1/Sync Enable (SYNCE).0 = auto resync enabled1 = auto resync disabledBit 2/Sync Time (SYNCT).0 = qualify 10 bits1 = qualify 24 bitsBit 3/Sync Criteria (SYNCC).In D4 Framing Mode.0 = search for Ft pattern, then search for Fs pattern1 = cross couple Ft and Fs patternIn ESF Framing Mode.0 = search for FPS pattern only1 = search for FPS and verify with CRC6Bits 4 to 5/Out Of Frame Select Bits (OOF2, OOF1).OOF2 OOF1 OUT OF FRAME CRITERIA0 0 2/4 frame bits in error0 1 2/5 frame bits in error1 0 2/6 frame bits in error1 1 2/6 frame bits in errorBit 6/Auto Resync Criteria (ARC).0 = resync on OOF or RCL event1 = resync on OOF onlyBit 7/Unused, must be set to zero for proper operation.41 of 242