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參數(shù)資料
| 型號： | ICS2595 |
| 英文描述： | User-Programmable Dual High-Performance Clock Generator |
| 中文描述： | 用戶可編程雙路高性能時鐘發(fā)生器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 272K |
| 代理商： | ICS2595 |
ICS2595
LATCHED FS inputs, not the FS inputs themselves, that
are interpreted by the internal logic. Interface logic resides
between the FS input pins and the programming/frequency
select logic. The appropriate "data write" procedure must
be observed. See the section "Digital Interface" in this
supplement for more information.
These rules must be followed:
Calculate
T
max
and
T
min
in seconds (where R is the
modulus of the reference divider and
F
ref is the
reference frequency in Hz) by the following formulas:
A programming sequence consists of 42 successive
data writes to the device as shown in table 1: no delay
greater than
T
max
or less than
T
min
may occur between
any two successive writes.
A readback sequence consists of 64 successive data
writes to the device as shown in table 2: no delay
greater than
T
max
or less than
T
min
may occur between
any two successive writes.
Programming or readback sequences must be preceded
by a "quiet" period of at least 2*
T
max
with no data
writes to the device unless it was immediately preceded
by another legal programming (or readback) sequence
(nothing else in between)
To change the active VCLK frequency selection, simply
write that data to the device; the last data written to the
part will always become VCLK frequency select after
a delay of approximately 2*
T
max.
The internal shift
register is cleared at this time also.
The FS0 & FS1 inputs are not used for programming, so it
is possible to use a two-pin interface for programming and
frequency selection (any bank of four VCLK addresses).
The reference frequency source must be operational for
proper execution of the programming sequence. If the on-
chip crystal oscillator is, allow at least 4*
T
max
after the
device has valid power before attempting to program it.
Data Description
)
L
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
0
1
1
0
1
1
0
1
1
0
0
0
1
0
0
1
0
0
1
0
0
1
N
O
I
T
d
d
d
d
d
d
d
d
d
d
s
d
s
d
A
s
d
A
s
d
A
s
d
A
s
d
A
s
d
A
K
s
d
A
K
L
d
A
K
L
d
A
K
L
C
A
A
A
A
A
A
A
A
A
A
A
A
C
K
K
K
K
K
K
K
K
K
K
K
K
L
K
L
K
L
C
K
L
C
L
C
V
C
M
C
M
C
M
M
O
L
L
L
L
L
L
L
L
L
L
L
L
C
C
C
C
C
C
C
C
C
C
C
C
C
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
2
3
4
5
6
7
8
9
0
1
1
1
1
1
1
0
1
2
4
s
s
s
s
s
s
s
s
s
s
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
1
2
3
4
5
K
L
s
s
!"#$
%&
'&
)
D
0
0
0
1
1
R
E
D
I
V
I
8
4
2
1
D
-
T
S
O
P
1
0
1
T
min =
6* R
F
ref
T
max =
4096* R
F
ref
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