Ultra Dma Timings; Initiating Read Dma; Table 29. Ultra Dma Cycle Timings (Initiating Read) - Hitachi 7K100 - Travelstar - Hard Drive Specifications

7.9 Ultra DMA timings

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

7.9.1 Initiating Read DMA

DMARQ
DMACK-
STOP
HDMARDY-
DSTROBE
DD(15:0)
Table 29: Ultra DMA cycle timings (Initiating Read)
PARAMETER
DESCRIPTION
tUI Unlimited interlock time
tACK Setup time for DMACK-
tENV Envelope time
tZIORDY Minimum time before driv-
ing 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
tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
xxxxxxxxxxxxxxxxxxxxxxxxxxx
Host drives DD
MODE 0
MIN MAX MIN
(ns) (ns) (ns)
0 –
20 – 20
20 70 20
0 –
0 230
112 – 73
230 – 154
– 10
0 –
15 – 10
5 –
Travelstar 7K100 Hard Disk Drive Specification
tFS tCYC
tZAD
xxx xxxx
RD Data
Device drives DD
MODE 1 MODE 2
MAX MIN MAX
(ns) (ns) (ns)
0 – 0 –
– 20 –
70 20 70
0 – 0 –
0 200 0 170
– 54 –
– 115 –
– 10 – 10
0 – 0 –
– 7 –
5 – 5 –
43
t2CYC
tCYC
tDS
tDH
xxx
RD Data
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 –
MODE 5
MIN MAX
(ns) (ns)
0 –
20 –
20 50
0 –
0 90
16.8 –
38 –
– 10
0 –
4 –
4.6 –