Index Timing; General Control Timing Requirements - Quantum Q2080 Product Description

INDEX
U .... --...o(ff
1"'-10P.S
. . . . . . 1-------
20.38 ms NOM - - - - - -........
FIGURE 1-43
INDEX TIMING
u
• READY - A LO Level on this line indicates the drive is up to speed and the interface signals are valid.
When READY and SEEK COMPLETE are true, the drive is ready to read, write or seek.
• WRITE FAULT - A LO level on this line indicates write curent is flowing in the selected head and WRITE
GATE is not true (HI). Write Fault may be reset by: deselecting the drive, driving the Re-zero line, or cycling
the DC power off then on.
• SEEK COMPLETE - A LO level on this line indicates the RIW heads have settled on a cylinder and a read,
write or another seek may take place.
• M3 - When this output is selected by installing Jumper M3 on the control PCB, a LO level indicates that the
drive selected is a Model Q2080. Make sure that this line is not already used at 11-46.
Figure 1-44 shows the general timing relationships between some of the control signals found in the
Model Q2080.
NOTE: The air actuated actuator lock (AIRLOCK
TM)
will take 30s (MAX) to lock the actuator
after power is removed.
A.C. POWER ON
D.C. POWER ON
+
DRIVE READY
-SEEK COMPLETE
-TRACK 000
I
SSI
SSI
I
30S
NOM
25S
NOM
1
SSSSSSSSSJ
FIGURE 1-44
GENERAL CONTROL TIMING REQUIREMENTS
1-37
REV A (01/84)