DSP56367 datasheet(67/100 Pages) FREESCALE

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Serial Host Interface (SHI) I2C Protocol Timing

DSP56367 Technical Data, Rev. 2.1

Freescale Semiconductor

3-43

175 SCL low period

TLOW

4.7

—

1.3

—

µs

176 SCL high period

THIGH

4.0

—

1.3

—

µs

177 SCL and SDA rise time

—

1000

20 + 0.1

× C

300

178 SCL and SDA fall time

—

300

20 + 0.1

× C

300

179 Data set-up time

TSU;DAT

250

—

100

—

180 Data hold time

THD;DAT

0.0

—

0.0

0.9

µs

181 DSP clock frequency

• Filters bypassed

• Narrow filters enabled

• Wide filters enabled

FDSP

10.6

11.8

13.1

—

28.5

39.7

61.0

—

MHz

182 SCL low to data out valid

TVD;DAT

—

3.4

—

0.9

µs

183 Stop condition setup time

TSU;STO

4.0

—

0.6

—

µs

184 HREQ in deassertion to last SCL edge (HREQ in set-up

time)

tSU;RQI

0.0

—

0.0

—

186 First SCL sampling edge to HREQ output deassertion2

• Filters bypassed

• Narrow filters enabled

• Wide filters enabled

TNG;RQO

× T

C + 30

× T

C + 120

× T

C + 208

—

140

228

—

140

228

187 Last SCL edge to HREQ output not deasserted2

• Filters bypassed

• Narrow filters enabled

• Wide filters enabled

TAS;RQO

× T

C + 30

× T

C + 80

× T

C + 135

100

155

—

100

155

—

188 HREQ in assertion to first SCL edge

• Filters bypassed

• Narrow filters enabled

• Wide filters enabled

TAS;RQI

0.5

× T

I2CCP -

0.5

× T

C - 21

4327

4282

4238

—

927

882

838

—

187 First SCL edge to HREQ in not asserted (HREQ in hold

time.)

tHO;RQI

0.0

—

0.0

—

1 V

CC = 1.8 V ± 5%; TJ = –40°C to +95°C, CL = 50 pF

2 Pull-up resistor: R

P (min) = 1.5 kOhm

3 Capacitive load: C

b (max) = 400 pF

4 It is recommended to enable the wide filters when operating in the I2C Standard Mode.

5 The timing values are derived from frequencies not exceeding 100 MHz.

6 It is recommended to enable the narrow filters when operating in the I2C Fast Mode.

Table 3-17 SHI I2C Protocol Timing (continued)

Standard I2C

No.

Characteristics1, 2, 3

Symbol/

Expression

Standard4, 5

Fast-Mode5, 6

Unit

Min

Max

Min

Max

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