Maxtor 6800 manual DMA Timing

AT INTERFACE DESCRIPTION

DMA Timing

TIMING PARAMETERS

MODE 0

MODE 1

MODE 2

t0

Cycle Time (min)

480 ns

150 ns

120 ns

tC

DMACK to DMARQ delay

tD

DIOR-/DIOW- (min)

215 ns

80 ns

70 ns

tE

DIOR- data access (min)

150 ns

60 ns

tF

DIOR- data hold (min)

5 ns

5 ns

5 ns

tG

DIOR-/DIOW- data setup (min)

100 ns

30 ns

20 ns

tH

DIOW- data hold (min)

20 ns

15 ns

10 ns

tI

DMACK to DIOR-/DIOW- setup (min)

0

0

0

tJ

DIOR-/DIOW- to DMACK hold (min)

20 ns

5 ns

5 ns

tKr

DIOR- negated pulse width (min)

50 ns

50 ns

25 ns

tKw

DIOW- negated pulse width (min)

215 ns

50 ns

25 ns

tLr

DIOR- to DMARQ delay (max)

120 ns

40 ns

35 ns

tLw

DIOW- to DMARQ delay (max)

40 ns

40 ns

35 ns

tZ

DMACK- to tristate (max)

20 ns

25 ns

25 ns

Figure 5 - 3

Multi-word DMA Data Transfer

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