Hitachi 7K400 Specifications - Page 148

Streaming Access Latency - DMA and PIO

Page 148 highlights

Table 95: Identify device information (Part 6 of 7) Word 93 Content XXXXH Description Hardware reset result. Bit assignments 15-14 (=01) Word 93 is valid 13 CBLID- status 1=above Vih 0=below Vil 12- 8 Device 1 hardware reset result Device 0 clear these bits to 0 12 Reserved 11 PDIAG- assertion 1 = asset 0 = not assert 10-9 How to determine the device number: 00= Reserved 01= a jumper was used 10= the CSEL signal was used 11= some other method used or method unknown 8 Shall be set to one if Device 1 7- 0 Device 0 hardware reset result 7 Reserved 6 Respond for Device 1 1= respond 0= not respond 5 DASP- detection 1= detect 0= not detect 4 PDIAG- detection 1= pass 0= fail 3 Device 0 diagnostic 1= pass 0= fail 2-1 How to determine the device number 00=Reserved 01=Jumper 10=CSEL signal 11=Other method 0 Shall be set to one if Device 0 94 XXXXH Current Advanced Acoustic Management value 15- 8 Vendor's Recommended Acoustic Management level 7- 0 Current Acoustic Management level 95 xxxxH Stream Minimum Request Size Number of sectors that provides optimum performance in streaming environment. This number shall be a power of two, with a minimum of eight sectors (4096 bytes). The starting LBA value for each stream- ing command should be evenly divisible by this request size. 96 xxxxH Streaming Transfer Time - DMA The worst-case sustainable transfer time per sector for the device is calculated as follows: Streaming Transfer Time = (word 96) * (words(99:98) / 65536) If the Streaming Feature set is not supported by the device, the content of word 96 shall be zero. 97 xxxxH Streaming Access Latency - DMA and PIO The worst-case access latency of the device for a streaming command is calculated as follows: Access Latency = (word 97) * (words(99:98) / 256) If the Streaming Feature set is not supported by the device, the content of word 97 shall be zero. Deskstar 7K400 Hard Disk Drive Specification 134

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Deskstar 7K400 Hard Disk Drive Specification
134
Table 95: Identify device information (Part 6 of 7)
Word
Content
Description
93
XXXXH
Hardware reset result. Bit assignments
15-14 (=01)
Word 93 is valid
13
CBLID- status
1=above Vih 0=below Vil
12- 8
Device 1 hardware reset result
Device 0 clear these bits to 0
12
Reserved
11
PDIAG- assertion 1 = asset
0 = not assert
10-9
How to determine the device number:
00= Reserved
01= a jumper was used
10= the CSEL signal was used
11= some other method used or method unknown
8
Shall be set to one if Device 1
7- 0
Device 0 hardware reset result
7
Reserved
6
Respond for Device 1
1= respond
0= not respond
5
DASP- detection
1= detect
0= not detect
4
PDIAG- detection
1= pass
0= fail
3
Device 0 diagnostic
1= pass
0= fail
2-1 How to determine the device number
00=Reserved
01=Jumper
10=CSEL signal
11=Other method
0
Shall be set to one if Device 0
94
XXXXH
Current Advanced Acoustic Management value
15- 8
Vendor’s Recommended Acoustic Management level
7- 0
Current Acoustic Management level
95
xxxxH
Stream Minimum Request Size
Number of sectors that provides optimum performance in streaming
environment. This number shall be a power of two, with a minimum of
eight sectors (4096 bytes). The starting LBA value for each stream-
ing command should be evenly divisible by this request size.
96
xxxxH
Streaming Transfer Time - DMA
The worst-case sustainable transfer time per sector for the device
is calculated as follows:
Streaming Transfer Time = (word 96) * (words(99:98) / 65536)
If the Streaming Feature set is not supported by the device, the
content of word 96 shall be zero.
97
xxxxH
Streaming Access Latency - DMA and PIO
The worst-case access latency of the device for a streaming command
is calculated as follows:
Access Latency = (word 97) * (words(99:98) / 256)
If the Streaming Feature set is not supported by the device, the
content of word 97 shall be zero.