DS21Q44

DS21Q44 Enhanced QUAD E1 FRAMER www.dalsemi.com FEATURES Four E1 (CEPT or PCM-30) /ISDN-PRI framing transceivers All four framers are fully independent; transmit and receive sections of each framer are fully independent Frames to FAS, CAS, CCS, and CRC4 formats Each of the four framers contain dual two– frame elastic store slip buffers that can connect to asynchronous backplanes up to 8.192 MHz 8–bit parallel control port that can be used directly on either multiplexed or non– multiplexed buses (Intel or Motorola) Easy access to Si and Sa bits Extracts and inserts CAS signaling Large counters for bipolar and code violations, CRC4 code word errors, FAS word errors, and E-bits Programmable output clocks for Fractional E1, per channel loopback, H0 and H12 applications Integral HDLC controller with 64-byte buffers configurable for Sa bits or DS0 operation Detects and generates AIS, remote alarm, and remote multiframe alarms Pin compatible with DS21Q42 Enhanced Quad T1 Framer 3.3V supply with 5V tolerant I/O; low power CMOS Available in 128–pin TQFP package IEEE 1149.1 support FUNCTIONAL DIAGRAM Receive Fram er Transm it Form atter FRAMER #0 FRAMER #1 FRAMER #2 FRAMER #3 Control Port Elastic Store Elastic Store ACTUAL SIZE QUAD E1 FRAMER ORDERING INFORMATION DS21Q44T DS21Q44TN (00 C to 700 C) (-400 C to +850 C) DESCRIPTION The DS21Q44 E1 is an enhanced version of the DS21Q43 Quad E1 Framer. The DS21Q44 contains four framers that are configured and read through a common micro...