Seagate Medalist Pro 6530 Manual download pdf (Page 49)

The drives operate at multiword DMA mode 2 timing specifications, as

shown below.

Time Description Min Max

T0 Cycle time 120 nsec —

TD DIOW– or DIOR– pulse width (16-bit) 70 nsec —

TE DIOR– data access — —

TF DIOR– data hold 5 nsec —

TG DIOW– data setup 20 nsec —

TH DIOW– data hold 10 nsec —

TI DMACK– to DIOR– or DIOW– setup 0 nsec —

TJ DIOR– or DIOW– to DMACK– hold 5 nsec —

TK

R

DIOR– negated pulse width 25 nsec —

TK

W

DIOW– negated pulse width 25 nsec —

TL

R

DIOR– to DMARQ delay — 35 nsec

TL

W

DIOW– to DMARQ delay — 25 nsec

DMACK−

DMARQ

T0

DIOR− or DIOW−

Read data valid

Write data valid

TK

TG

TDTI TJ

TH

TF

TL

TE

Figure 10. Multiword DMA timing

Medalist Pro 9140, 6530 and 4520 Product Manual, Rev. B 41

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