bios與硬盤-文庫吧
2025-02-27 12:39 本頁面
【正文】 ASI繼承而來， Shugart Associate System Interface； ? 1982年， ANSI開發(fā)了 SASI規(guī)范，后更名為 SCSI； ? SCSI 是一種智能的點對點接口，它隱藏了物理格式的復(fù)雜性 ? 同一總線可以支持 8到 16塊硬盤 ? 從 1986年開始， SCSI被 Amiga, Apple Macintosh和 Sun公司的電腦產(chǎn)品線以及 PC服務(wù)器系統(tǒng)； ? 很多廠商在低端產(chǎn)品線上仍然選擇 PATA ? T10負(fù)責(zé)實際的開發(fā)工作 SCSI Small Computer System Interface ATA SCSI Hot Swapping ? Bandwidth 5120 Mbit/s ? Width 16bit ? Connector 68pins。 80pins ? Alternative Ultra5 ? Spec SCSI3 SPI5 (2023) ? Clock 160 MHz DDR Parallel SCSI – Ultra640 SCSI 硬盤的故事 – Serial SCSI ? Serial attached SCSI 使用作過修改的 SATA數(shù)據(jù)線和電源線，但需要 SAS控制器支持 ? iSCSI iSCSI使用網(wǎng)絡(luò)物理硬件，一般是以太網(wǎng)接口和線纜作為物理層傳輸 ? USB Attached SCSI 使用 USB作為物理層傳輸數(shù)據(jù) ? FCAL Fiber Channel Serial SCSI SAS/SATA 規(guī)范介紹 SAS Protocol Layer SAS Physical Layer SAS Physical Layer ? PHY層定義了 8b10b編碼以及 OOB信號 將 8比特編碼成含有十個比特的字符 字母符號具有特殊的意義，它包括描述信息以及控制變量 SAS PHY Layer SAS PHY Layer ? SATA OOB Sequence SAS PHY Layer – OOB ? SAS To SATA PHY OOB Sequence SAS PHY Layer OOB ? SAS To SAS PHY OOB Sequence ? COMSAS Burst Process SAS Speed Negation SATA Speed Negation ? Primitives Primitives是第一個字符為 SAS Link Layer ? Address Frames Address frames are used for the identification sequence and for connection requests. a) performs and identification sequence by transmitting an IDENTIFY address frame b) performs a hard reset sequence by transmitting a HARD_RESET primitive sequence ? Connections ? Overview SAS Port Layer ? State Machine Example ? How To Bind A Disk Notation To Its Relative PhyID How Linux Kernel Allocates Disk Notation? How Linux Kernel Notifies Disk Notation Allocation Program When A Disk Is Found? Why The Sequence Is Still Disordered Even If We Do Not Hot Plug? W/A To Bind? ? Example Analysis ? Overview SAS Transport Layer ? SSP ? STP A SATA device phy transmits a Register Device to Host FIS after pleting the link reset sequence The expander device shall update a set of shadow registers with the contents of this FIS and shall not deliver it to any STP initiator port. SMP initiator ports may read the shadow register contents using the SMP REPORT PHY SATA function The expander device originates a Broadcast(Change) after receiving the Register Device to Host FIS ? SMP ? SCSI application layer SCSI transport proto
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