Ultra Dma Timings; Initiating Read Dma; Figure 40. Ultra Dma Cycle Timings (Initiating Read) - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

7.9 Ultra DMA timings

The Ultra DMA timings meet Mode 0, 1, 2, 3, 4, and 5 of the Ultra DMA Protocol.

7.9.1 Initiating Read DMA

DMARQ
DMACK-
STOP
HDMARDY-
DSTROBE
DD(15:0)
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PARAMETER DESCRIPTION
tUI Unlimited interlock time
tACK Setup time for DMACK-
tENV Envelope time
tZIORDY Minimum time before
driving IORDY
tFS First DSTROBE time
tCYC Cycle time
t2CYC Two cycle time
tAZ Maximum time allowed for
output drivers to release
tZAD Drivers to assert
tDS Data setup time at host
tDH Data hold time at host

Figure 40. Ultra DMA cycle timings (Initiating Read)

tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
Host drives DD
MODE 0
MIN MAX
(ns) (ns)
0
20
20
0
0 230
112
230
–
0
15
5
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
tFS
tDS
tAZD
xxx
RD Data
Device drives DD
MODE 1 MODE 2
MIN MAX MIN MAX
(ns) (ns) (ns) (ns)
– 0 – 0 –
– 20 – 20 –
70 20 70 20 70
– 0 – 0 –
0 200 0 170
– 73 – 54 –
– 154 – 115 –
10 – 10 – 10
– 0 – 0 –
– 10 – 7 –
– 5 – 5 –
50
t2CYC
tCYC
tCYC
tDH
xxx xxx
RD Data
MODE 3 MODE 4
MIN MAX MIN MAX
(ns) (ns) (ns) (ns)
0 – 0 –
20 – 20 –
20 55 20 55
0 – 0 –
0 130 0 120
39 – 25 –
86 – 57 –
– 10 – 10
0 – 0 –
7 – 5 –
5 – 5 –
RD Data
MODE 5
MIN MAX
(ns) (ns)
0 –
20 –
20 50
0 –
– 90
16.8 –
38 -
10
0 –
4.8 –
4.8 –