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15/24 SR-C8002 Rev.1.0
6.2.3.Timing of Host Interface (DMA Multi)
Figure 10 shows the Host Interface DMA multi word Timings
DMARQ
DMACK-*1
DIOR-/DIOW-*1
Read
DD0-15
Write
DD0-15
tZ
tI
tJ
tD
tE
tL
tF
tH
tG
t0
tK
*1: In all timing diagrams, the low line indicator negated, and the upper line
indicators asserted.
Multi word DMA
timing parameters min(ns) max(ns)
Min time (ns) Max time (ns)
t0
Cycle time
120
tC
DMACK to DMREQ delay
---
tD
DIOR-/DIOW-16-bit
70
tE
DIOR- data access
---
tF
DIOR- data hold
5
tZ
DMACK- to tristate
25
tG
DIOR/DIOW- data setup
20
tH
DIOW- data hold
10
tI
DMACK to DIOR-/DIOW- setup
0
tJ
DIOR-/DIOW- to DMACK hold
5
tKr
DIOR- negated pulse width
25
tKw
DIOW- negated pulse width
25
tLr
DIOR- to DMREQ delay
35
tLw
DIOR- to DMREQ delay
35
Figure 10 Host Interface Timing (Multi Word DMA Mode 2)