Ultra Dma Timings; Initiating Read Dma; Figure 38. Ultra Dma Cycle Timing (Initiating Read) - IBM DJSA-210 - Travelstar 10 GB 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)
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 38. Ultra DMA cycle timing
tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
xxxxxxxxxxxxxxxxxxxxxxxxxxx
Host drives DD
(Initiating Read)
Travelstar 32GH/30GT/20GN hard disk drive specifications
tFS tCYC
tZAD
xxx xxxx
RD Data
Device drives DD
MODE 0 MODE 1
MIN MAX MIN MAX
(ns) (ns) (ns) (ns)
0 – 0 –
20 – 20 –
20 70 20 70
0 – 0 –
0 230 0 200
112 – 73 –
230 – 154 –
– 10 – 10
0 – 0 –
15 – 10 –
5 – 5 –
49
t2CYC
tCYC
tDS
tDH
xxx
RD Data
RD Data
MODE 2 MODE 3 MODE 4
MIN MAX MIN MAX MIN
(ns) (ns) (ns) (ns) (ns)
0 – 0 – 0
20 – 20 – 20
20 70 20 55 20
0 – 0 – 0
0 170 0 130 0
54 – 39 – 25
115 – 86 – 57
– 10 – 10 –
0 – 0 – 0
7 – 7 – 5
5 – 5 – 5
MAX
(ns)
–
–
55
–
120
–
–
10
–
–
–