Maxim DS21Q55 Hdlc Controllers, Test and Diagnostics, Extended System Information Bus

Product Preview DS21Q55

§Hardware-signaling capability

−Receive-signaling reinsertion to a backplane, multiframe sync

−Availability of signaling in a separate PCM data stream

−Signaling freezing

§Ability to pass the T1 F-bit position through the elastic stores in the 2.048MHz backplane mode

§Access to the data streams in between the framer/formatter and the elastic stores

§User-selectable synthesized clock output

1.1.7 HDLC Controllers

§Two independent HDLC controllers

§Fast load and unload features for FIFOs

§SS7 support for FISU transmit and receive

§Independent 128-byte RX and TX buffers with interrupt support

§Access FDL, Sa, or single/multiple DS0 channels

§DS0 access includes Nx64 or Nx56

§Compatible with polled or interrupt-driven environments

§ Bit Oriented Code (BOC) support

1.1.8 Test and Diagnostics

§ Programmable on-chip Bit Error Rate Testing (BERT) § Pseudorandom patterns including QRSS

§ User-defined repetitive patterns § Daly pattern

§Error insertion single and continuous

§ Total-bit and errored-bit counts § Payload Error Insertion

§Error insertion in the payload portion of the T1 frame in the transmit path

§Errors can be inserted over the entire frame or selected channels

§Insertion options include continuous and absolute number with selectable insertion rates

§ F-bit corruption for line testing

§Loopbacks (remote, local, analog, and per-channel loopback)

1.1.9 Extended System Information Bus

§Host can read interrupt and alarm status on up to eight ports with a single-bus read

1.1.10 Control Port

§8-bit parallel control port

§Multiplexed or no nmultiplexed buses

§Intel or Motorola formats

§Supports polled or interrupt-driven environments

§Software access to device ID and silicon revision

§Software-reset supported

Automatic clear on power-up

§Flexible register-space resets

§Hardware reset pin

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Please contact telecom.support@dalsemi.com or search http://www.maxim-ic.com for updated

information.