IBM Deskstar 120 GXP, Specifications

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6.2.4 Ultra DMA timings
The Ultra DMA timing meets Mode 0,1,2,3 4, and 5 of the Ultra DMA Protocol.
6.2.4.1 Initiating Read DMA
DSTROBE
HDMARDY-
DMACK-
DMARQ
STOP
tUI
tACK
tENV
tACK tENV
tZIORDY
tFS tCYC tCYC
t2CYC
DD(15:00)
tZAD tAZ
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Host drives DD
Device drives DD
tDH
tDS
RD Data
RD Data
RD Data
tDZFS
tDS
tDH
Figure 27. Ultra DMA cycle timing chart (Initiating Read)
- 25 - 6.7 - 20 - 31 - 48 - 70
Time from data output re-
leased-to-driving until the first
transition of critical timing
tDZFS
– 4.6 – 5 – 5 – 5 – 5 – 5 Data hold time (at host) tDH
– 4 – 5 – 7 – 7 – 10 – 15 Data setup time (at host) tDS
– 0 – 0 – 0 – 0 – 0 – 0
Maximum time allowed for
output drivers to assert
tZAD
10 – 10 – 10 – 10 – 10 – 10 –
Maximum time allowed for
output drivers to release
tAZ
– 38 – 57 – 86 – 115 – 153 – 230 Two cycle time t2CYC
– 17 – 25 – 39 – 54 – 73 – 112 Cycle time tCYC
90 0 120 0 130 0 170 0 200 0 230 0 First DSTROBE time tFS
– 0 – 0 – 0 – 0 – 0 – 0
Minimum time before driving
IORDY
tZIORDY
50 20 55 20 55 20 70 20 70 20 70 20 Envelope time tENV
– 20 –
20
– 20 – 20 – 20 – 20 Setup time before –DMACK tACK
– 0 – 0 – 0 0 0 – 0 – 0 Unlimited interlock time tUI
MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
MODE5 MODE4 MODE3 MODE2 MODE1 MODE0
PARAMETER DESCRIPTION
(all values in ns)
Figure 28. Ultra DMA cycle timings (Initiating Read)
Deskstar 120GXP hard disk drive specifications
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