T7121-EL2 Ver la hoja de datos (PDF) - Agere -> LSI Corporation
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T7121-EL2 Datasheet PDF : 68 Pages
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T7121 HDLC Interface for ISDN (HIFI-64)
Data Sheet
April 1997
Table of Contents
Contents
Page
Features ................................................................................................................................................................... 1
Description................................................................................................................................................................ 1
Pin Information ......................................................................................................................................................... 4
Functional Description .............................................................................................................................................. 8
Microprocessor Bus Interface ................................................................................................................................ 8
Addressing .......................................................................................................................................................... 8
Interrupts ............................................................................................................................................................. 8
Resets ................................................................................................................................................................. 9
FIFO Memory Buffers ............................................................................................................................................ 9
Transmit FIFO ..................................................................................................................................................... 9
Receive FIFO .................................................................................................................................................... 10
Block Move........................................................................................................................................................ 10
Serial Link Interface .......................................................................................................................................... 10
Enabling the Transmitter and Receiver ............................................................................................................. 10
Time-Slot Feature ............................................................................................................................................. 13
Transmission During Unassigned Time Slots ................................................................................................... 14
Bit Order During Transmission .......................................................................................................................... 14
Bit Masking........................................................................................................................................................ 16
SLD and IOM2 Examples.................................................................................................................................. 19
HDLC Operation .................................................................................................................................................. 19
Zero-Bit Insertion/Deletion (Bit Stuffing/Destuffing) .......................................................................................... 19
Transmitter FIFO ............................................................................................................................................... 21
Sending 1-Byte Frames .................................................................................................................................... 21
Transmitter Underrun ........................................................................................................................................ 21
Using the Transmitter Status and Fill Level ...................................................................................................... 21
Receiver FIFO ................................................................................................................................................... 21
Receiver Overrun .............................................................................................................................................. 23
Operational Note (T7121-EL, T7121-PL, T7121-EL2, and T7121-PL2) ............................................................ 23
Transparent Mode................................................................................................................................................ 24
Diagnostic Modes ................................................................................................................................................ 25
Loopbacks ......................................................................................................................................................... 25
3-State Mode..................................................................................................................................................... 28
Other ................................................................................................................................................................. 28
Powerdown Mode ................................................................................................................................................ 28
Registers.............................................................................................................................................................. 28
Absolute Maximum Ratings.................................................................................................................................... 45
Electrical Characteristics ........................................................................................................................................ 45
Clock Characteristics.............................................................................................................................................. 46
Timing Characteristics ............................................................................................................................................ 46
TDM Frame Timing Diagrams.............................................................................................................................. 46
Multiplexed Address and Data ............................................................................................................................. 51
Separate Address and Data................................................................................................................................. 53
Concentration Highway........................................................................................................................................ 55
Handling Precautions ............................................................................................................................................. 59
Outline Diagrams.................................................................................................................................................... 60
28-Pin, Plastic DIP ............................................................................................................................................... 60
28-Pin, Plastic SOJ, Surface Mounting................................................................................................................ 61
Ordering Information............................................................................................................................................... 62
Appendix................................................................................................................................................................. 63
Transparent Mode................................................................................................................................................ 63
HDLC Mode ......................................................................................................................................................... 63
General Features ................................................................................................................................................. 64
Power and Ground............................................................................................................................................... 66
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