477
(
3
)
Bus Timing
Tables 20.6 to 20.8 show the bus timing.
Table 20.6
Bus Timing (1)
Conditions: V
CC
= 5.0 V ±10%, AV
CC
= 5.0 V ±10%, AV
CC
= V
CC
±10%, AV
ref
= 4.5 V to
AV
CC
, V
SS
= AV
SS
= 0 V,
φ
= 20 MHz, Ta = –20 to +75°C*
Note: * Regular-specification products; for wide-temperature-range products, Ta = –40 to +85°C
Item
Symbol
Min
Max
Unit
Figures
Address delay time
t
AD
—
20
*
1
ns
20.8, 20.9, 20.11–20.14,
20.19, 20.20
CS
delay time 1
t
CSD1
—
25
ns
20.8, 20.9, 20.20
CS
delay time 2
t
CSD2
—
25
ns
CS
delay time 3
t
CSD3
—
20
ns
20.19
CS
delay time 4
t
CSD4
—
20
ns
Access time 1
*
6
35% duty
*
2
t
RDAC1
t
cyc
×
0.65 – 20—
ns
20.8,
from read strobe
50% duty
t
cyc
×
0.5 – 20 —
ns
Access time 2
*
6
from read strobe
35% duty
*
2
t
RDAC2
t
cyc
×
(n+1.65)
– 20
*
3
—
ns
20.9, 20.10
50% duty
t
cyc
×
(n+1.5)
– 20
*
3
—
ns
Access time 3
*
6
from read strobe
35% duty
*
2
t
RDAC3
t
cyc
×
(n+0.65)
– 20
*
3
—
ns
20.19
50% duty
t
cyc
×
(n+0.5)
– 20
*
3
—
ns
Read strobe delay time
t
RSD
—
20
ns
20.8, 20.9, 20.11–20.15,
20.19
Read data setup time
t
RDS
15
—
ns
20.8, 20.9, 20.11–20.14,
Read data hold time
t
RDH
0
—
ns
20.19
Write strobe delay time 1
t
WSD1
—
20
ns
20.9, 20.13, 20.14,
20.19, 20.20
Write strobe delay time 2
t
WSD2
—
20
ns
20.9, 20.13, 20.14,
20.19
Write strobe delay time 3
t
WSD3
—
20
ns
20.11, 20.12
Write strobe delay time 4
t
WSD4
—
20
ns
20.11, 20.12, 20.20
Write data delay time 1
t
WDD1
—
35
ns
20.9, 20.13, 20.14, 19
Write data delay time 2
t
WDD2
—
20
ns
20.11, 20.12
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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