Quantum FIREBALL PLUS AS 10.2 Product Manual page 73

6.4.2.2 6.4.2.2 6.4.2.2 6.4.2.2 Multiword DMA Transfer Mode Multiword DMA Transfer Mode Multiword DMA Transfer Mode Multiword DMA Transfer Mode
The multiword DMA host interface timing shown in Table 6-6 is in reference to
signals at 0.8 volts and 2.0 volts. All times are in nanoseconds, unless otherwise
noted. Figure 6-2 provides a timing diagram.
Table 6-6 Table 6-6
Table 6-6 Table 6-6
SYMBOL SYMBOL SYMBOL SYMBOL
t0 t0 t0 t0
tD DIOR–/DIOW– Pulsewidth
tE DIOR– to Data Valid
tF DIOR– Data Hold
tFz DIOR– Data Tristate
tG DIOW– Data Setup
tH DIOW– Data Hold
tI DMACK to DIOR–/DIOW– Setup
tJ DIOR–/DIOW– to DMACK– Hold
tK DIOR–/DIOW– Negated Pulsewidth min
tL DIOR–/DIOW– to DMARQ Delay
tz DMACK– Data Tristate
1. ATA Mode 2 timing is listed for reference only.
2. The Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT drive tristates
after each word transferred.
3. Symbol tz only applies on the last tristate at the end of a multiword DMA transfer
cycle.
Figure 6-2 Figure 6-2
Figure 6-2 Figure 6-2
Multiword DMA Host Interface Timing
DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION
Cycle Time Cycle Time Cycle Time Cycle Time
2
3
Multiword DMA Bus Interface Timing
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
ATA Bus Interface and ATA Commands
1 1 1 1
MODE 2 MODE 2 MODE 2 MODE 2
MIN/MAX MIN/MAX MIN/MAX MIN/MAX
(local bus) (local bus)
(local bus) (local bus)
120
min min min min
min 70
max –
min 5
max 20
min 20
min 10
min 0
min 5
25
max 35
max 25
Quantum Quantum Quantum Quantum
Fireball Plus Fireball Plus Fireball Plus Fireball Plus
AS AS
AS AS
AT AT AT AT
120
70
–
5
20
20
10
0
5
25
35
25
6-11