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Figure 8: True IDE PIO mode Read/Write waveforms
1.
2.
3.
The device addresses consists of –CS0, ?CS1, and A2 -A0.
The Data I/O consist of D15-D0 (16-bit) or D7-D0 (8 bit).
– IOCS16 is shown for PIO modes 0, 1 and 2. For other modes, this signal is ignored.
Table 23: True IDE PIO mode Read/Write timing (1)
Parameter
Symbol
Mode 0
(ns)
1
(ns)
2
(ns)
3
(ns)
4
(ns)
5 (5)
(ns)
6 (5)
(ns)
Cycle time (min)
t 0
(2)
600
383
240
180
120
100
80
Address Valid to – IORD/-IOWR setup (min)
t 1
70
50
30
30
25
15
10
-IORD/-IOWR (min)
-IORD/-IOWR (min) Register (8 bit)
t 2
t 2
(2)
(2)
165
290
125
290
100
290
80
80
70
70
65
65
55
55
t 2i
-IORD/-IOWR recovery time (min)
-IOWR data setup (min)
-IOWR data hold (min)
-IORD data setup (min)
(2)
t 3
t 4
t 5
-
60
30
50
-
45
20
35
-
30
15
20
70
30
10
20
25
20
10
20
25
20
5
15
20
15
5
10
-IORD data hold (min)
t 6z
(3)
5
5
5
5
5
5
5
-IORD data tri-state (max)
Address valid to – IOCS16 assertion (max)
t 7
t 8
(4)
(4)
30
90
30
50
30
40
30
NA
30
NA
20
NA
20
NA
Address valid to – IOCS16 released (max)
-IORD/-IOWR to address valid hold
t 7
t 9
60
20
45
15
30
10
NA
10
NA
10
NA
10
NA
10
1.
2.
3.
4.
The maximum load on – IOCS16 is 1 LSTTL with a 50pF total load.
t 0 is the minimum total cycle time, t 2 is the minimum command active time, and t 2i is the minimum command recovery time or
command inactive time. The actual cycle time equals the sum of the actual command inactive time. The three timing requirements
of t0, t 2 , and t 2i have to be met. The requirement is greater than the sum of t 2 and t 2i . This means a host implementation can ensure
that t0 is equal to or greater than the value reported in the devices identify drive Card implementation should support any legal
host implementation.
This parameter specifies the time from the falling edge of – IORD to the moment when the CompactFlash TM Memory Card (tri-state).
t 7 and t 8 apply only to modes 0, 1 and 2. The – IOCS16 signal is not valid for other modes.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 23 of 102
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