Motorola DSP56367 User Manual page 128

Specifications
Serial Host Interface (SHI) I
3.13 SERIAL HOST INTERFACE (SHI) I
No.
Characteristics
Tolerable spike width on SCL or SDA
Filters bypassed
Narrow filters enabled
Wide filters enabled
171 SCL clock frequency
171 SCL clock cycle
172 Bus free time
173 Start condition set-up time
174 Start condition hold time
175 SCL low period
176 SCL high period
177 SCL and SDA rise time
178 SCL and SDA fall time
179 Data set-up time
180 Data hold time
181 DSP clock frequency
Filters bypassed
Narrow filters enabled
Wide filters enabled
182 SCL low to data out valid
183 Stop condition set-up time
184 HREQ in deassertion to last SCL edge
(HREQ in set-up time)
186 First SCL sampling edge to HREQ output
deassertion
Filters bypassed
Narrow filters enabled
Wide filters enabled
3-62
2
C Protocol Timing
2
Table 3-20 SHI I C Protocol Timing
Symbol/
1,2,3
Expression
—
F
SCL
T
SCL
T
BUF
T
SU;STA
T
HD;STA
T
LOW
T
HIGH
T
R
T
F
T
SU;DAT
T
HD;DAT
F
DSP
T
VD;DAT
T
SU;STO
t
SU;RQI
T
NG;RQO
×
2 T + 30
C
×
2 T + 120
C
×
2 T + 208
C
DSP56367
2
C PROTOCOL TIMING
4
Standard Mode Fast Mode
Min Max Min
— 0 —
— 50 —
— 100 —
— 100 —
10 — 2.5
4.7 — 1.3
4.7 — 0.6
4.0 — 0.6
4.7 — 1.3
4.0 — 1.3
— 1000
20 + 0.1
— 300
20 + 0.1
250 — 100
0.0 — 0.0
10.6 — 28.5
11.8 — 39.7
13.1 — 61.0
— 3.4 —
4.0 — 0.6
0.0 — 0.0
— 46.7 —
— 136.7 —
— 224.7 —
5
Unit
Max
0 ns
50 ns
100 ns
400 kHz
µs
—
µs
—
µs
—
µs
—
µs
—
µs
—
×
300 ns
C
b
×
300 ns
C
b
— ns
µs
0.9
— MHz
— MHz
— MHz
µs
0.9
µs
—
— ns
ns
46.7
136.7
224.7
MOTOROLA