Seagate Medalist Pro 4520, Product Manual

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The drives operate at sustained synchronous DMA burst timing specifi-
cations, as shown below.
Time Description Mode 0 Mode 1 Mode 2
Tcyc Cycle time 114 nsec 75 nsec 55 nsec
T2cyc Two Cycle times 235 nsec 156 nsec 117 nsec
Tds
Data setup time
(at receiver)
15 nsec 10 nsec 7 nsec
Tdh
Data hold time
(at receiver)
3 nsec 3 nsec 3 nsec
Tdv
Data valid setup
time (at sender)
75 nsec 48 nsec 34 nsec
Tdvs
Data valid hold time
(at sender)
6 nsec 6 nsec 6 nsec
Note. Mode values show the minimum time only. Maximum values do
not apply.
Tds
Tdh Tdh
Strobe at
Sender
T2cyc
Tcyc Tcyc
Tdvh
Tdvs Tdvs
T2cyc
Data at
Sender
Strobe at
Receiver
Data at
Receiver
Tdvh Tdvh
Tdh
Tds
Figure 11. Sustained synchronous DMA burst
42 Medalist Pro 9140, 6530 and 4520 Product Manual, Rev. B