DatasheetsPDF.com

Am85C30 Dataheets PDF



Part Number Am85C30
Manufacturers Advanced Micro Devices
Logo Advanced Micro Devices
Description Serial Communications Controller
Datasheet Am85C30 DatasheetAm85C30 Datasheet (PDF)

Am8530H/Am85C30 Serial Communications Controller 1992 Technical Manual A D V A N C E D M I C R O D E V I C E S © 1992 Advanced Micro Devices, Inc. Advanced Micro Devices reserves the right to make changes in its products without notice in order to improve design or performance characteristics. This publication neither states nor implies any warranty of any kind, including but not limited to implied warrants of merchantability or fitness for a particular application. AMD assu.

  Am85C30   Am85C30


Document
Am8530H/Am85C30 Serial Communications Controller 1992 Technical Manual A D V A N C E D M I C R O D E V I C E S © 1992 Advanced Micro Devices, Inc. Advanced Micro Devices reserves the right to make changes in its products without notice in order to improve design or performance characteristics. This publication neither states nor implies any warranty of any kind, including but not limited to implied warrants of merchantability or fitness for a particular application. AMD assumes no responsibility for the use of any circuitry other than the circuitry in an AMD product. The information in this publication is believed to be accurate in all respects at the time of publication, but is subject to change without notice. AMD assumes no responsibility for any errors or omissions, and disclaims responsibility for any consequences resulting from the use of the information included herein. Additionally, AMD assumes no responsibility for the functioning of undescribed features or parameters. Product names used in this publication are for identification purposes only and may be trademarks of their respective companies. Trademarks Z80 and ZBus are registered trademarks of Zilog, Inc. Z8000, Z8030, and Z8530 are trademarks of Zilog, Inc. MULTIBUS is a registered trademark of Intel Corporation PAL is a registered trademark of Advanced Micro Devices, Inc. ii PREFACE Thank you for your interest in the SCC, one of the most popular Serial Data ICs available today. This manual is intended to provide answers to technical questions about the Am8530H and Am85C30. If you have already used the Am8530H and are familiar with the previous editions of this Technical Manual, you will find that some chapters are virtually unchanged. The Am8030’s functionality, however, has been omitted from this revision since a CMOS Am8030 was not developed. You can, however, consult the previous Am8030/8530 Technical Manual revision for information pertaining to Am8030 operation. Functional descriptions of enhancements added to the Am85C30 have been included in this Technical Manual revision. These enhancements improve the Am85C30’s functionality and allow it to be used more effectively in high-speed applications. These enhancements include: s a 10 x 19-bit SDLC/HDLC frame status FIFO array s a 14-bit SDLC/HDLC frame byte counter s automatic SDLC/HDLC opening flag transmission s automatic SDLC/HDLC Tx Underrun/EOM flag resetting s automatic SDLC/HDLC Tx CRC generator presetting s RTS pin synchronization to closing SDLC/HDLC flag s DTR/REQ deactivation delay significantly reduced s external PCLK to RxC or TxC synchronization requirement eliminated for PCLK divideby-four operation s complete SDLC/HDLC CRC character reception s reduced INT response time s Write data setup time to rising edge of WR requirement eliminated s Write Registers WR3, WR4, WR5, and WR10 made readable Most users read only chapters that are of interest to them. If you are designing the microcomputer hardware using the SCC as a peripheral, you will want to read the Applications Section in Chapter 7. Application notes covering the interfacing of the Am8530H (pre Hstep and CMOS versions only) to the 8086/80186, 68000 processors and Am7960 Data Coded Transceiver have been included. As was the case with the NMOS SCC, some points to look out for when using the Am85C30 are: s Follow the worksheet for initialization (Chapter 7). Unexplainable operations may occur if this procedure is not followed. s Watch out for the Write Recovery time violation. The specification for this (Trc) was changed on both the H-step and CMOS version. It is now referenced from falling edge to falling edge of the Read/Write pulse. Trc is spec’d at 4 PCLKs for the NMOS H-step and 3 PCLKs (best case)/3.5 PCLKs for the Am85C30. s Ensure Mode bits are not changed when writing commands. Each Mode bit affects only one function and a Command bit entry requires a rewrite of the entire register; therefore, care must be taken to insure the integrity of the Mode bits whenever a new command is issued. s Any unused input pins should be tied high. TABLE OF CONTENTS Chapter 1 General Information 1.1 1.2 1.3 1.4 1.5 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5.1 System Interface Pin Descriptions . . . . . . . . . . . . . . . 1.5.2 Serial Channel Pin Descriptions . . . . . . . . . . . . . . . . 1–3 1–3 1–5 1–6 1–8 1–8 1–9 Chapter 2 System Interface 2.1 2.2 2.3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


AM8530H Am85C30 AM85C30


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)