NORME CEI INTERNATIONALE IEC 60821 INTERNATIONAL STANDARD 1991 AMENDEMENT 1 AMENDMENT 1 1999-01 EAYOOKSULYBURAU Amendment 1 VMEbus - Microprocessor system bus L1 for 1 byte to 4 byte data Amendement 1 Bus VMEbus - Bus systeme a microprocesseurs pour données de 1 octet a 4 octets @ IEC 1999 Droits de reproduction réserves - Copyright - all rights reserved International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland Telefax:+41229190300 e-mail: [email protected] IEC web site http: //www.iec.ch Commission Electrotechnique Internationale CODE PRIX E( International Electrotechnical Commission PRICE CODE MemAyHapoAHan SnekTpoTexHMyeckan KoMccuA Pour prix,voir catalogue en vigueur For price, see current catalogue 60821 Amend. 1 @ IEC:1999(E) FOREWORD This amendment has been prepared by subcommittee 26: Microprocessor systems, of the Joint Technical Committee ISO/IEc JTC 1: information technology. The text of this amendment is based on the following documents: 1xe1 Report on voting ISO/IEC JTC1/SC 26 N 237 1ISO/IECJTC1/SC26N218 Full information the voting for the approval of this amendment can be found in the report on voting indicated in the above table. CHAPTER 2: IEC 60821 BUS DATA TRANSFER BUS Page 67 2.2.4.5WRITE* Replace the first sentence of this subclause by the following NCH WRITE* is a level significant signal line that is strobed by the falling edge of the first data strobe (DSA*) and is valid as long as any data strobe (DSA* or DSB*) is low. Page 89 2.3.6 Basic data transfer capabilities Replace Rule 2.65 by the following: DO8(O) SLAVES MUST NOT respond by driving DTACK* low during cycles that request access to byte locations BYTE(O), BYTE(2), BYTE(1-2), BYTE(2-3), BYTE(0-2), BYTE(1-3), or BYTE(0-3). Insert, at the end of Suggestion 2.8, the following text: 4) When a D08(O) SLAVE is requested to do a BYTE(O) or BYTE(2) transfer. Page 93 Table 2-10 - Mnemonics that specify basic data transfer capabilities "must monitor". 60821 Amend. 1 @ IEC:1999(E) - 3 - 2.3.7 Block transfer capabilities Replace, on page 97, at the end of the first sentence of Observation 2.87, "D08-D15" by "D00-D15" Page 99 Table 2-11 - Mnemonic that specifies block transfer capabilities Replace, in the third column, the words "Can accept" and"Can monitor" by "Must accept" and "Must monitor". EN Page 101 Table 2-12 - Mnemonic that specifies read-modify-write capabilities ON Replace, in the third column, the words "Can accept" and"Can monitor" by "Must accept" and "Must monitor". Page 103 NCH/ 2.3.9 Unaligned transfer capabilities Page 105 Table 2-13 - Transferring 32 bits of data using multiple byte transfer cycles Replace,in row B, line 3,and line 6,"Group 1, BYTE(O)"by"GROUP 2, BYTE(O)" Replace, in row D, line 6, "D00-D23" by"D00-D07". Page 107 Table 2-14 - Transferring 16 bits of data using multiple byte transfer cycles Replace,in rowF, line1,"D08-D15"by"D00-D07" Replace,inrow F, line 2,"D16-D23"by"D08-D15". RULE 2.6 Replace, at the beginning of the sentence, "D08(0)" by"D08(O)" Replace the text before table 2-15 and after RULE 2.6 by: Table 2-15 lists how the unaligned transfer (UAT) mnemonic is used to describe MASTERS and SLAVES.