DS21Q44 データシートの表示（PDF） - Maxim Integrated

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DS21Q44

Enhanced Quad E1 Framer

Maxim Integrated 

www.maxim-ic.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

8.192MHz

§ 8-bit parallel control port that can be used

directly on either multiplexed or

nonmultiplexed 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

DS21Q44

Enhanced Quad E1 Framer

FUNCTIONAL DIAGRAM

Receive

Framer

Elastic

Store

Transmit

Formatter

FRAMER #0

FRAMER #1

FRAMER #2

FRAMER #3

Elastic

Store

Control Port

ACTUAL SIZE

QUAD

E1

FRAMER

ORDERING INFORMATION

DS21Q44T

0°C to +70°C

DS21Q44TN

-40°C to +85°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 microprocessor-compatible parallel port. Each

framer consists of a receive framer, receive elastic store, transmit formatter, and transmit elastic store. All

four framers in the DS21Q44 are totally independent; they do not share a common framing synchronizer.

The transmit and receive sides of each framer are also totally independent. The dual two-frame elastic

stores contained in each of the four framers can be independently enabled and disabled as required. The

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

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