Ultra Dma Timings; Initiating Read Dma; Figure 43. Ultra Dma Cycle Timing (Initiating Read) - IBM IC25N020ATDA04 - Travelstar 20 GB 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)
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 43. Ultra DMA cycle timing
tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
xxxxxxxxxxxxxxxxxxxxxxxxxxx
Host drives DD
MODE 0
MIN
(ns)
0
20
20
0
0
112
230
–
0
15
5
(Initiating Read)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
tFS
tZAD
xxx
RD Data
Device drives DD
MODE 1 MODE 2
MAX MIN MAX MIN MAX
(ns) (ns) (ns) (ns) (ns)
– 0 – 0
– 20 – 20
70 20 70 20
– 0 – 0
230 0 200 0 170
– 73 – 54
– 154 – 115
10 – 10 –
– 0 – 0
– 10 – 7
– 5 – 5
54
t2CYC
tCYC tCYC
tDS
tDH
xxxx xxx
RD Data
MODE 3 MODE 4
MIN MAX MIN MAX
(ns) (ns) (ns) (ns)
– 0 – 0 –
– 20 – 20 –
70 20 55 20 55
– 0 – 0 –
0 130 0 120
– 39 – 25 –
– 86 – 57 –
10 – 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 –