Hitachi DK23EA Specifications - Page 89
Read Data Valid to IORDY active
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Figure 6-5 IORDY Timing Read Data Valid DIOR-/DIOW- tA tB IORDY SYMBOL Description tA IORDY Setup Time tB IORDY Pulse Width tRD Read Data Valid to IORDY active tB IORDY assertion to release tRD tC MIN(ns) 0 MAX(ns) 35 1250 5 çççç Figure 6-6 Single Word DMA Data Transfer Timing(Mode 2) DMARQ DMACKDIOR-/DIOWWrite Data Valid *3 Read Data Valid *3 tC tI tD tJ tG tH tE tS tF *3 Data Consists of DD(15:0) SYMBOL Description t0 Cycle Time tC DMACK- to DMARQ delay tD DIOR- / DIOW- Pulse Width tE DIOR- Data Access tF DIOR- Data Hold tG DIOW- Data Setup tH DIOW- Data Hold tI DMACK- to DIOR- / DIOW- Setup tJ DIOR- / DIOW- to DMACK- Hold tS DIOR- Setup MIN(ns) 240 120 5 35 20 0 0 tD-tE K6602637 Rev.3 02.27.01 - 89 - MAX(ns) 80 60
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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