360014937
Copyright ©2000 Toshiba corporation. All rights reserved.
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534
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10.4.2 Program I/O Read Timing
Transfer
mode
Symbol Meaning
0
1
2
3
4
t
ASE
Address Setup to -DIOR Low
(min.)
70
50
30
30
25
t
DAC
Data Valid from -DIOR Low
(max.)
t
RE
-DIOR Pulse Width
(min.)
165
125
100
80
70
t
RDSE
-DIOR data setup
(min.)
50
35
20
20
20
t
DOH
Data Hold from -DIOR High
(min.)
5
5
5
5
5
t
HDTS
Data Tri-state from -DIOR High
(max.)
30
30
30
30
30
t
AHE
ADDR Hold from -DIOR High
(min.)
20
15
10
10
10
t
RDR
-DIOR
Inactive
(min.) - - - 70
25
t
RDCY
Read Cycle Time
(min.)
600
383
240
180
120
t
CICSV
-IOCS16 valid from -CS
(max.)
90
50
40
n/a*
n/a*
t
AICSV
-IOCS16 valid from address
(max.)
90
50
40
n/a*
n/a*
t
AICSI
-IOCS16 inactive from address
(max.)
60
45
30
n/a*
n/a*
t
RD
Read Data Valid to IORDY
(min.)
0
0
0
0
0
t
A
IORDY Setup time
(max.)
35
35
35
35
35
t
B
IORDY Pulse Width
(max.)
1250
1250
1250
1250
1250
(
*
) -IOCS16 is specified in ATA-2 specifications. For other modes, this signal is invalid. Drive releases
-IOCS16 within the time of t
AICSI
, but how long it takes to turn to inactive condition is defined by pull up
resistance, output impedance and line capacitance.
t
ASE
t
AHE
t
AICSI
t
A
t
B
t
AICSV
t
CICSV
t
RDSE
t
DOH
t
RDCY
t
RDR
t
RE
DA2, DA1, DA0
-CS0, -CS1
-DIOR
DD15
∼
DD0
-IOCS16
IORDY
t
HDTS
t
DAC
t
RD
