DS21FF44 datasheet(4/117 Pages) MAXIM

4 / 117 page

DS21FT44/DS21FF44

4 of 117

TABLE OF CONTENTS

1. DESCRIPTION....................................................................................................................................1

2. MCM PIN DESCRIPTION ................................................................................................................7

3. DS21FF44 (4 x 4) PCB LAND PATTERNS ....................................................................................15

4. DS21FT44 (4 x 3) PCB Land Pattern ..............................................................................................16

5. DS21Q42 DIE DESCRIPTION ........................................................................................................17

6. DS21Q44 INTRODUCTION ............................................................................................................18

7. DS21Q44 PIN FUNCTION DESCRIPTION ..................................................................................20

8. DS21Q44 REGISTER MAP .............................................................................................................27

9. PARALLEL PORT ...........................................................................................................................32

10. CONTROL, ID, AND TEST REGISTERS.....................................................................................32

11. STATUS AND INFORMATION REGISTERS .............................................................................42

12. ERROR COUNT REGISTERS........................................................................................................50

13. DS0 MONITORING FUNCTION ...................................................................................................53

14. SIGNALING OPERATION .............................................................................................................56

14.1 PROCESSOR-BASED SIGNALING ...........................................................................................56

14.2 HARDWARE-BASED SIGNALING ...........................................................................................59

15. PER–CHANNEL CODE GENERATION AND LOOPBACK.....................................................60

15.1 TRANSMIT SIDE CODE GENERATION ..................................................................................60

15.1.1 Simple Idle Code Insertion and Per-Channel Loopback.......................................................60

15.1.2 Per-Channel Code Insertion..................................................................................................62

15.2 RECEIVE SIDE CODE GENERATION......................................................................................62

16. CLOCK BLOCKING REGISTERS................................................................................................63

17. ELASTIC STORES OPERATION..................................................................................................64

17.1 RECEIVE SIDE.............................................................................................................................65

17.2 TRANSMIT SIDE .........................................................................................................................65

DS21FF44 Datasheet(PDF) 4 Page - Maxim Integrated Products