DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 70
![IC FRAMER E1 4X4 16CH 300-BGA](/photos/6/82/68293/300-bga_21-0304_sml.jpg)
DS21FF44
Manufacturer Part Number
DS21FF44
Description
IC FRAMER E1 4X4 16CH 300-BGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS21FT44N.pdf
(117 pages)
Specifications of DS21FF44
Controller Type
E1 Framer
Interface
Parallel/Serial
Voltage - Supply
2.97 V ~ 3.63 V
Current - Supply
300mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
300-BGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Manufacturer
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DS21FT44/DS21FF44
19.
HDLC Controller for the Sa Bits or DS0
Each framer in the DS21Q44 has the ability to extract/insert data from/ into the Sa bit positions (Sa4 to
Sa8) or from/to any multiple of DS0 channels Each framer contains a complete HDLC controller and this
operation is covered in Section 19.1.
19.1. General Overview
Each framer contains a complete HDLC controller with 64–byte buffers in both the transmit and receive
directions. The HDLC controller performs all the necessary overhead for generating and receiving a
HDLC formatted message.
The HDLC controller automatically generates and detects flags, generates and checks the CRC check
sum, generates and detects abort sequences, stuffs and destuffs zeros (for transparency), and byte aligns
to the HDLC data stream.
There are eleven registers that the host will use to operate and control the operation of the HDLC
controller. A brief description of the registers is shown in Table 19-1.
70 of 117
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