Ultra Dma Timings; Figure 26. Ultra Dma Cycle Timing Chart (Initiating Read); Figure 27. Ultra Dma Cycle Timings (Initiating Read) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

7.2.4 Ultra DMA timings

The Ultra DMA timing meets Mode 0,1,2,3 4, and 5 of the Ultra DMA Protocol.
7.2.4.1 Initiating Read DMA
DMARQ
DMACK-
STOP
HDMARDY-
DSTROBE
DD(15:00)
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Figure 26. Ultra DMA cycle timing chart (Initiating Read)

PARAMETER DESCRIPTION
(all values in ns)
tUI Unlimited interlock time
tACK Setup time before –DMACK
tENV Envelope time
Wait time before driving
tZIORDY
DSTROBE
tFS First strobe time
tCYC Cycle time
t2CYC 2 cycle time
tAZ Output release time
tZAD Output enable time
tDVS Data setup time (at device side)
tDVH Data hold time (at device side)

Figure 27. Ultra DMA cycle timings (Initiating Read)

tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
Host drives DD
MODE0
MIN MAX
0 –
20 –
20 70
0 –
– 230
112 –
230 –
– 10
0 –
70 –
6.2 –
Deskstar 40GV & 75GXP hard disk drive specifications
t2CYC
tFS tCYC
tZAD
tDVS
xxx xxx
RD Data
Device drives DD
MODE1 MODE2
MIN MAX MIN MAX MIN
0 – 0 0
20 – 20 –
20 70 20 70
0 – 0 –
– 200 – 170
73 – 54 –
153 – 115 –
– 10 – 10
0 – 0 –
48 – 31 –
6.2 – 6.2 –
32
tCYC
tDVH
xxx
RD Data RD Data
MODE3 MODE4 MODE5
MAX MIN MAX MIN
0 – 20 – 0
20 – – 20
20 55 20 55 20
0 – 0 – 0
– 130 – 120 –
39 – 25 – 16.8
86 – 57 – 38
– 10 – 10 –
0 – 0 – 0
20 – 6.7 – 4.8
6.2 – 6.2 – 4.8
MAX
–
–
50
–
90
–
–
10
–
–
–