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DS21Q41B Dataheets PDF



Part Number DS21Q41B
Manufacturers Dallas Semiconducotr
Logo Dallas Semiconducotr
Description Quad T1 Framer
Datasheet DS21Q41B DatasheetDS21Q41B Datasheet (PDF)

DS21Q41B Quad T1 Framer www.dalsemi.com FEATURES § § § § § Four T1 DS1/ISDN-PRI framing transceivers All four framers are fully independent Frames to D4, ESF, and SLC-96 formats 8-bit parallel control port that can be connected to either multiplexed or nonmultiplexed buses Each of the four framers contains dual twoframe elastic stores that can connect to asynchronous or synchronous backplanes up to 8.192 MHz Extracts and inserts robbed bit signaling Framer and payload loopbacks Large counters f.

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DS21Q41B Quad T1 Framer www.dalsemi.com FEATURES § § § § § Four T1 DS1/ISDN-PRI framing transceivers All four framers are fully independent Frames to D4, ESF, and SLC-96 formats 8-bit parallel control port that can be connected to either multiplexed or nonmultiplexed buses Each of the four framers contains dual twoframe elastic stores that can connect to asynchronous or synchronous backplanes up to 8.192 MHz Extracts and inserts robbed bit signaling Framer and payload loopbacks Large counters for BPVs, LCVs, EXZs, CRC6, PCVs, F-bit errors and the number of multiframes out of sync Contains ANSI 1s density monitor and enforcer CSU loop code generator and detector Programmable output clocks for Fractional T1, ISDN-PRI, Actual Size and per channel loopback applications Onboard FDL support circuitry Pin-compatible with DS21Q43 Quad E1 Framer 5V supply; low power CMOS Available in 128-pin TQFP Industrial (-40°C to +85°C) grade version available (DS21Q41BTN) FUNCTIONAL DIAGRAM RECEIVE FRAMER ELASTIC STORE TRANSMIT FORMATTER ELASTIC STORE § § § § § § § § § § § FRAMER #0 FRAMER #1 FRAMER #2 FRAMER #3 CONTROL PORT ACTUAL SIZE QUAD T1 FRAMER DESCRIPTION The DS21Q41B combines four of the popular DS2141A T1 Controllers onto a single monolithic die. The “B” designation denotes that some new features are available in the Quad version that were not available in the single T1 device. The added features in the DS21Q41B are listed in Section 1. The DS21Q41B offers a substantial space savings to applications that require more than one T1 framer on a card. The Quad version is only slightly bigger than the single T1 device. All four framers in the DS21Q41B are totally independent; they do not share a common framing synchronizer. Also, the transmit and receive sides of each framer are totally independent. The dual two-frame elastic stores contained in each of the four framers can be independently enabled and disabled as required. The DS21Q41B meets all of the latest specifications including ANSI T1.403 (and the emerging T1.403-199X), ANSI T1.231-1993, AT&T TR62411, AT&T TR54016, ITU G.704 and G.706. 1 of 61 092299 DS21Q41B 1.0 INTRODUCTION The DS21Q41B Quad T1 Framer is made up of five main parts: framer #0, framer #1, framer #2, framer #3, and the control port which is shared by all four framers. See the Block Diagram in Figure 1-1. Each of the four framers within the DS21Q41B maintain the same register structure that appeared in the DS2141A. The two framer select inputs (FS0 and FS1) are used to determine which framer within the DS21Q41B is being accessed. In this manner, software written for the DS2141A can also be used with only slight modifications, in the DS21Q41B. Several new features have been added to the framers in the DS21Q41B over the DS2141A. Below is short list of the new features. More details can be found in Sections 2 through 12. ADDED FEATURE Non-multiplexed parallel control port operation ANSI ones density monitor (transmit and receive si.


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