Seagate ST318418N Product Manual - Page 84
Barracuda 36ES2 Product Manual, Rev. B, Notes., Drive activity LED
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74 Barracuda 36ES2 Product Manual, Rev. B Table 17: Disc drive SCSI timing (Continued) Description Data In Byte Transfer (parameter) Data Out Byte Transfer (parameter) Next Data In Byte Access (parameter) Next Data Out Byte Access (parameter) Data In Byte Transfer (media) [2] Data Out Byte Transfer (media) [2] Next Data In Byte access (media [2] Next Data Out Byte access (media [2] MSG IN Byte Transfer MSG OUT Byte Transfer STATUS Byte Transfer Synchronous Data Transfer Characteristics: Request Signal Transfer Period [3] Waveform symbol [1] T24 T25 T26 T27 T28 T29 T30 T31 T32 T33 T34 - Waveform table [1] 4.5-12 4.5-13 4.5-12 4.5-13 4.5-12 4.5-13 4.5-12 4.5-13 4.5-5,7,8,14,15 4.5-2 4.5-5,8,15 Typical timing 0.04 µs 0.04 µs 0.12 µs 0.12 µs 0.04 µs 0.04 µs 0.12 µs 0.12 µs 0.04 µs 0.04 µs 0.04 µs - various (800 ns max) Notes. [1] See the SCSI Interface Product Manual, part number 75789509, timing examples section. [2] Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual. [3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is capable of setting periods as given in Section 9.5. See also the Synchronous data transfer section and the Extended messages section of the SCSI Interface Product Manual, for a description of synchronous data transfer operation. 9.11 Drive activity LED The following table provides drive activity LED status. Table 18: Drive activity LED status Spindle status Command status LED status Spinning up with DC power applied N/A Spun down Start Unit Powered down by removal of DC power N/A On until spinup is complete On while processing the command Off due to absence of power Spun up Spun down Spun down Stop Unit No command activity Write/Read Buffer On while processing the command Off On while processing the command Spun down Spun down Spun up Spun up Spun up Spun up Spun up Spun up SCSI Bus Reset On while processing the reset Test Unit Ready On while processing the command No command activity Off Write/Read On while processing the command SCSI Bus Reset On while processing the reset Test Unit Ready On while processing the command Format with Immediate option on On while the command is initially processed Format without Immediate LED toggles on/off on each cylinder boundary
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