K6602637
Rev.3
02.27.01
- 89 -
Figure 6-5 IORDY Timing
SYMBOL
Description
MIN(ns)
MAX(ns)
t
A
IORDY Setup Time
35
t
B
IORDY Pulse Width
1250
t
RD
Read Data Valid to IORDY active
0
t
B
IORDY assertion to release
5
Figure 6-6 Single Word DMA Data Transfer Timing(Mode 2)
*3 Data Consists of DD(15:0)
SYMBOL
Description
MIN(ns)
MAX(ns)
t
0
Cycle Time
240
t
C
DMACK- to DMARQ delay
80
t
D
DIOR- / DIOW- Pulse Width
120
t
E
DIOR- Data Access
60
t
F
DIOR- Data Hold
5
t
G
DIOW- Data Setup
35
t
H
DIOW- Data Hold
20
t
I
DMACK- to DIOR- / DIOW- Setup
0
t
J
DIOR- / DIOW- to DMACK- Hold
0
t
S
DIOR- Setup
t
D
-t
E
t
C
t
D
t
I
t
J
t
G
t
S
t
H
t
F
DMARQ
DMACK-
DIOR-/DIOW-
Write Data Valid *3
Read Data Valid *3
t
E
t
A
t
B
DIOR-/DIOW-
IORDY
t
RD
Read Data Valid
t
C