X3T9.2/92-70 Date: March 16, 1992 To: X3T9.2 Membership From: Lawrence J. Lamers, X3T9.2 Secretary Dal Allan, Chair ATA Extensions Working Group Subject: March 16, 1992 ATA Extensions Working Group Meeting Minutes Dal Allan called the meeting to order at 2:00 p.m. March 16, 1992. He thanked Marilyn Martinez of AMCC for hosting the meeting. The ATA Extensions working group is responsible for developing extensions to the functionality and features of the AT Attachment interface. Dal Allan chairs this working group. The final agenda was as follows: 1. PCMCIA/ATA Proposal 2. CHS/LBA Selection 3. Autoincrement and Sector Number Register 4. 68-Pin ATA Connection (Blagaila) [92-063R0] 5. Auto-select Proposal (Hanan) [92-064R0] 6. Support for 528MB+ Drives (Shah) [92-065R0] 7. DMA Timing 8. Document Editors 9. Meeting Schedule The following people attended the meeting: Name Status Organization Phone Number ------------------------- ------ ------------------------------ -------------- Mr. Thomas Newman P Adaptec, Inc. (408) 945-8600 Mr. Ray Kubick A Apple Computer (408) 974-5896 Mr. Robert Brown O Areal Technology (408) 436-6871 Mr. David Ruxton O Calluna Technology Limited 44-(0)592-6308 10 Mr. Joe Chen P Cirrus Logic Inc. (510) 226-2101 Mr. John Geldman A Cirrus Logic Inc. (510) 226-2368 Mr. Charles Monia P Digital Equipment Corp. (508) 841-6757 Mr. Ralph Weber A Digital Equipment Corp. (603) 881-1497 Mr. John A. Gallant A Digital Equipment Corp. (603) 881-2472 Mr. Skip Jones A Emulex Corp. (714) 668-5058 Mr. Phil Rafnel V Emulex Corp. Mr. I. Dal Allan P ENDL (408) 867-6630 Mr. Robert Liu P Fujitsu Computer Products,Am (408) 894-3790 Mr. John Blagaila V Integral Peripherals (303) 449-8009 Mr. Tom Taetsch O Intellistor, Inc. (303) 682-6651 Mr. Lawrence J. Lamers P Maxtor Corp. (408) 432-3889 Mr. Reginald J. Murray V Ministor Peripherals Corp. (408) 943-0165 Mr. Stephen F. Heil P Panasonic Technologies, Inc (201) 348-7064 Mr. Richard Blackborow A Quantum Corp. (408) 894-5477 Mr. Gene Milligan A Seagate Technology (405) 324-3070 Mr. Hale Landis A Seagate Technology (408) 439-2443 Mr. Shiv Shivaji O Seagate Technology (612) 844-8257 Mr. Michael Scott O Silicon Systems (714) 573-6613 Mr. Mike Holt O Silicon Systems (714) 573-6871 Mr. Shishir Shah A Western Digital (714) 932-7235 25 People Present Status Key: P Principal O Observer A Alternate S,V Visitor The following documents were distributed at the meeting: 92-063R0 68-Pin IDE Pinout (Blagaila) 92-064R0 Autoselect Proposal (Hanan) 92-065R0 Support for 528MB+ Drives (Shah) Results of Meeting 1. PCMCIA/ATA Proposal It was reported that Sundisk was close to having a final draft document. However several folks enumerated a list of outstanding items that need discussion: - removability: how to handle drive identification - CIS issues: there are two views on this, one that contains a lot of information and one that is smaller and easier to implement in silicon. Tom Hanan stated that what is needed is a CIS with a table of default values that are replaceable. - 8- or 16-bit capability is reported both in ATA and CIS. - the method of selecting 8- or 16-bit operation. - PCMCIA/ATA proposes using a flat 24-bit logical block address space. - Register addressing method. - Power management needs clarification of working in conjunction with ATA commands. - Master/Slave operation using timing instead of PDIAG/DASP. - Write protect feature in PCMCIA. The question was raised that if the PCMCIA/ATA definition is to support the Card Configuration Status register what is the interaction the bits in that register with the features they impact in ATA? The consensus of the group was to draft a letter expressing the concerns of the ATA Extensions working group and sending it to John Reimer, Mark Cummings, and Tony Wutka. 2. CHS/LBA Selection The current PCMCIA/ATA proposal uses a value of 00b in bits 6 and 5 to select logical block mode. It was pointed out that this violates the IDE compatibility model since a value of 00b has been used in the past for defect management. [NOTE: 00b selects 256 byte sectors, 01b selects 512 byte sectors, 10b selects 1024 byte sectors, and 11b selects 128 byte sectors.] Shishir Shah stated that a value of 11b should be used to select logical block mode since that value has not been used, and therefore has no compatibility issues. He also proposed defining Bit 9 in Word 49 (drive capability) as an LBA capable bit. 3. Autoincrement and Sector Number Register An issue was raised related to how PCMCIA/ATA would use the sector number register. This is a base 1 value, not base 0 as the other registers are. This is an issue for programming the task file when the autoincrement feature, which exists in today's silicon is used. Shishir Shah proposed treating the logical block address as a 28-bit unsigned register, and treat the low-order 8-bits as an 8-bit unsigned register. He stated that he would submit his proposal to the PCMCIA BBS and include the justifications for it. 4. 68-Pin ATA Connection (Blagaila) [92-063R0] John Blagaila of Integral made a proposal for a 68-pin implementation of ATA. This proposal has no compatibility with PCMCIA/ATA. If the drive could be connected to a PCMCIA socket it would enter a deep sleep mode. 5. Auto-select Proposal (Hanan) [92-064R0] Shishir Shah presented a proposal for automatically selecting between ATA and PCMCIA/ATA. Due to time constraints there was no discussion. 6. Support for 528MB+ Drives (Shah) [92-065R0] Shishir submitted this document for consideration but it was not discussed due to lack to time. 7. DMA Timing Jim McGrath still had not provided minutes of the meeting at Quantum. The silicon vendors were interested in proceeding even without that input. Due to time constraints the folks interested in DMA timing and silicon issues convened a separate meeting. Skip Jones led this effort. 8. Document Editors Tom Newman will edit a first draft of the ATA extensions that covers mapping the ATA interface to 68-pins. 9. Meeting Schedule The ATA Extensions working group meeting for May is on Monday, May 19, 1992 at 2:00 pm at the Holiday Inn in Harrisburg, PA.