DS21455/DS21458数据手册ADI中文资料规格书

描述 Description

The DS21455 and DS21458 are quad monolithic devices featuring independent transceivers that can be software configured for Tl, El, or Jl operation.Each is composed of a line interface unit(LIU), framer, HDLC controllers, and a TDM backplane interface, and is controlled via an 8-bit parallel port configured for Intel or Motorola bus operations. The DS21455* is a direct replacement for the older DS21Q55 quad MCM device. The DS21458, in a smaller package(17mm CSBGA) and featuring an improved controller interface, is software compatible with the older DS21Q55.

特性 Features

• Complete T1 (DS1)/ISDN-PRI/J1 Transceiver Functionality\r
• Complete E1 (CEPT) PCM-30/ISDN-PRI Transceiver Functionality\r
• Short- and Long-Haul Line Interface for Clock/Data Recovery and Waveshaping\r
• CMI Coder/Decoder\r
• Crystal-Less Jitter Attenuator\r
• Fully Independent Transmit and Receive Functionality\r
• Dual HDLC Controllers\r
• On-Chip Programmable BERT Generator and Detector\r
• Internal Software-Selectable Receive- and Transmit-Side Termination Resistors for 75Ω/100Ω/120Ω T1 and E1 Interfaces\r
• Dual Two-Frame Elastic-Store Slip Buffers that can Connect to Asynchronous Backplanes Up to 16.384MHz\r
• 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz Clock Output Synthesized to Recovered Network Clock\r
• Programmable Output Clocks for Fractional T1, E1, H0, and H12 Applications\r
• Interleaving PCM Bus Operation\r
• 8-Bit Parallel Control Port, Multiplexed or Nonmultiplexed, Intel or Motorola\r
• IEEE 1149.1 JTAG-Boundary Scan\r
• 3.3V Supply with 5V Tolerant Inputs and Outputs\r
• DS21455 Directly Replaces DS21Q55\r
• Signaling System 7 (SS7) Support\r
• RAI-CI, AIS-CI Support