dsp56004 Freescale Semiconductor, Inc, dsp56004 Datasheet - Page 56

• Manufacturer Part Number: dsp56004
• Description: Symphonytm Audio Dsp Family 24-bit Digital Signal Processors
• Manufacturer: Freescale Semiconductor, Inc

No.
171 SCL Serial Clock
172 Bus Free Time
173 Start Condition
— Tolerable Spike
Specifications
Serial Host Interface (SHI) I
2-32
Width on SCL or
SDA
Cycle
Set-up Time
Char.
Example: for C
when operating with a DSP56004 SHI I
must generate a bus free time greater than 36 ns (T172 slave). Thus, the minimum
permissible t
This implies a maximum I
In general, bus performance may be calculated from the C
Input Filter modes and operating frequencies of the master and the slave. Table 2-15
contains the expressions required to calculate all relevant performance timing for a
given C
L
t
SU;STA
and R
Sym.
t
t
BUF
SCL
I
2
Table 2-15 SHI Improved I
CCP
L
2
P
C Protocol Timing
.
= 50 pF, R
master
master
Mode
slave
slave
slave
Freescale Semiconductor, Inc.
is 56 T
Improved I
For More Information On This Product,
bypassed
bypassed
bypassed
bypassed
bypassed
bypassed
DSP56004/D, Rev. 3
C
2
narrow
narrow
narrow
narrow
narrow
narrow
P
Mode
Filter
C serial frequency of 1010 kHz.
wide
wide
wide
wide
wide
wide
which gives a bus free time of at least 41 ns (T172 master).
= 2 k , f = 88 MHz, Bypassed Filter mode: The master,
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2
C (C
L
t
t
= 50 pF, R
I
I
4
4
4
2
2
CCP
CCP
0.5
0.5
0.5
2
2
2
Expression
t
2
C slave with an 88 MHz operating frequency,
I
2
CCP
245 + t
535 + t
172 + t
366 + t
648 + t
T
2
T
T
T
42 – t
42 – t
42 – t
+ 3
+ 3
C Protocol Timing
C
100
T
T
T
150
C
C
C
+t
20
12
50
t
t
t
0
+72
C
C
C
I
I
I
+ T
+ T
+ T
+ 3
2
2
2
r
CCP
CCP
CCP
+ 11
+ 35
+ 70
P
r
r
r
r
r
r
r
r
H
H
H
= 2 k )
T
T
C
C
–
–
–
+
+
+
+
+
1050
1263
1593
Min Max Min Max Min Max
50 MHz
500
694
976
100
110
150
—
—
—
60
80
51
75
12
50
L
100
20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
and R
0
2
1007
1225
1591
66 MHz
478
672
954
102
100
150
—
—
—
46
68
41
65
12
50
P
of the bus, the
100
20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0
MOTOROLA
3
1212
1576
41.1
65.8
35.7
59.7
94.7
81 MHz
989
466
660
942
103
150
—
—
—
12
50
100
20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0
4
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
U
n
i
t