MCP BASED DMA SERIAL CARD ("Livonia") REV 1.4.2 (PVT PHASE) Mark Devon Networking and Communications 11/16/89 TABLE OF CONTENTS 1.1 System Overview 2.1 Processor 2.2 ROM 2.3 RAM 2.4 NuBus Interface 2.5 SCC Interface 3.0 Hardware Description Details 3.1 Address Map 3.2 NuBus Address Space 3.3 Timer 3.4 Reset 3.5 Interrupts 3.6 SCC Access 3.7 Serial I/O Signals 3.8 Serial Status Register 3.9 Configuration 3.10 Connector 4.0 DMA chip and registers 4.1 DMA Interface to MCP Local Bus 4.2 Access to DMA Registers by 68000 4.3 MC68450 DMA to 8530 SCC Interface 5.0 Cabling 6.0 Performance 7.0 Mechanical/Environmental 1.1.2 System Overview The "Livonia" board is a card with a full NuBus Master/Slave interface with a 68000 processor , 1/2 Mbyte of RAM (expandable to 2.5Mb), two SCC's and one Mc68450 DMA chip (4 channels) on board. It is based on Gary Martens' MCP Nubus interface card. The card provides four active ports, two of which can be run at speeds greater than 19.2kbit/s. These two high speed serial ports may be configured as V.35 ports for driving 56kb/s leased line DDS (modem-like) devices, or as RS-232 ports. The configuration choice is made by the type of connecting cable used. The 68000 can access any device on the NuBus. The DMA, EPROM, SCC's, local RAM and DTR/DSR registers and all may be accessed via Nubus. Accesses by the DMA to the Nubus are NOT supported. 2.1 Processor The I/O Processor utilizes a 10MHz 68000 processor with no wait states for accesses to onboard RAM. The 10MHz clock is derived from the 10MHz NuBus clock. All access by the 68000 are implemented by a 16-bit data bus with byte mode also supported. Accesses to the SCCs are done on a byte wide basis on D0-7 (odd addresses). Accesses to the DMA may be either byte or word mode. 2.2 ROM The 16-bit wide ROM is implemented with two 256K bit ROMS yielding a 64K byte ROM space. The ROM serves as "power-up" code for the 68000, a place for user firmware, and it also stores the NuBus ID data for the card. The ROM inserts one wait state when accessed by the onboard 68000. To the NuBus interface, ROM appears as a full 32-bit wide device, supporting 8-bit, 16-bit and 32-bit bus reads. 2.3 RAM The card contains 1/2 Mbyte of 16-bit wide dynamic RAM, with sockets available for a second 1/2 Mbyte (all ZIP chips). RAM is accessed by the 68000, NuBus, and the two DMA Chips (MC68450). When any device on the card is accessed via NuBus, the 68000 is locked out from all accesses. RAM starts at location 000000, with the default 1/2 Mbyte of RAM, the last RAM address is 07FFFF. When the 68000 accesses onboard RAM, no wait states are inserted. When the 68450 DMA chip accesses RAM, one wait state is inserted on write cycles, zero wait states inserted on read cycles (this is an anomaly in the DMA chip itself). Provision is made for future 4 Mbit DRAM ZIP chips (Qty. 4) which, when combined with the 1/2 Mbyte already present would give total of 2.5 Mbyte of RAM on the card. Pin 10 of the 1Mb …

I. ( ti. Apple® Serial NB card Installation Guide Serial Connection for a NuBus™ Production Draft ( May 17, 1989 Networking & Communications Publications AppleTalk Documentation Apple Confidential (J S APPLE COMPUTER, INC. This lll2!lual is copyrig}:led by Apple or by Apple's suppliers, with all rights reserved. UD:ier the copyrighI laws, this manual may 00! be copied, in whole or in pan, without the written consent ci Apple Computer, Inc. ~ exception does not allow copies to be made for others, whether or not sold, but all of the material purchased may be sold, gilten, or lent to another perscn Under the law, copying roudes translating into another language. The Apple logo is a registered trademark of Apple ~ter. Inc. Use of the "keyboard" Apple logo (Option-Shift-I{) for commercial purposes without the prior written consent of Apple may consttute trademark infringement and unfair competition in violatbn of federal and state laws. © Apple Computer, Inc., 1989 20525 Mariani Avenue Cupertino, CA 95014-6299 (408) 996-1010 Apple, the Apple logo, AppleTalk, and Macintosh are registered trademarks of Apple Computer, Inc. MacAPPC and Macintosh Coprocessor Platform are trademarks of Apple Computer, Inc. Motorola is a registered trademark of Motorola Corporation. NuBus is a trademark of Texas Instruments. Simultaneously published in the United Stales and Canada. ( LIMrrED W A.IUlANTY ON MEDIA AND REPUCEMENT If you discover physia.J defects in the manuals ~tribuled with an Apple product or in the media on which a software product is distributed, Apple will replace the media or !Il21luals at no charge to you, provided you rerum the iiem to be replaced wilh proof of purchase to Apple or an authoriled Apple dealer during the 90-<!ay period after you purchased the software. In addition, Apple will replace damaged aoftwarc media and manuals for as long as the software product is included in Apple'& Media Exchange Prcpm. While not an upgndc or update method, dlia program offers additional protection for up to two years or more from the date r:l your original purdwe. See your authorized Apple dealer for program cover.age and detailJ. In some countries the replacement period may be different; check with your authoriz:ed Apple dealer. AU IMPUED WAUANTIES ON THE MEDIA AND MANUAIS, INat!DING IMPUED WAJUlANTIIS OF .MUOL\NTABIUTY AND Frl'NW FOi A PA.II'IClJLAI. PURPOSE, AllE LIMITED IN DUIATION TO NINETY (90) DAYS FIOM THE DATE OF THE OllGINAL llTAIL PUl.OIASE OF DDS PRODUCT. Even though Apple lw tested the software and reviewed the documentation, APPU: MAKES NO WAJlllM'TY 01. .REPWENTATION, EITHEll EXP.RW 01. Jl1PLIED, wrrH WPECT TO SOFTIVAIE, rrs QUAUI'Y, Pf.IFOIMANCE, MEIOIANTABIUI'Y, OR FrrNESS FOi A PAmClJLAI. PUl.POSL AS A IESULT, 1lllS SOFTWARE IS SOlD •AS IS," AND YOU, THE PllllOIASEll, AIE ASSUMING THE ENTlllE llSK AS TO rrs QUAllI'Y AND PERFORMANCE. ( IN NO EVENT WILL APPU: BE llABU: FOil DIRECT, INDIRECT, SPEClAL, INODEJ'.l'TAL, OR CONSEQUENT…