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Specifications

Serial Peripheral Interface (SPI) Timing

SERIAL PERIPHERAL INTERFACE (SPI) TIMING

(VCC = 1.8 to 3.3 V, TA = 0 to +70°C)

Table 2-6 SPI Timing

 

 

Characteristic

Conditions

Symbol

Min

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating Frequency

fOP

0

1

MHz

 

Cycle Time

tCYC

1000

ns

 

Select Lead Time

tLEAD1

200

ns

 

De-select Lag Time

tLAG1

200

ns

 

Select-to-Ready Time

Previous packet did not program

tRDY

80

s

 

 

 

an address word; CL = 50 pf

 

 

 

 

 

Select-to-Ready Time

Previous packet programmed an

tRDY

420

s

 

 

 

address word; CL = 50 pf

 

 

 

 

 

Ready High Time

tRH

50

s

 

Ready Lead Time

tLEAD2

200

ns

 

Not Ready Lag Time

CL = 50pf

tLAG2

200

ns

 

MOSI Data Setup

tSU

200

ns

 

Time

 

 

 

 

 

 

 

 

 

 

 

 

 

MOSI Data Hold Time

tHI

200

ns

 

MISO Access Time

CL = 50pf

tAC

0

200

ns

 

MISO Disable Time

tDIS

300

ns

 

MISO Data Valid

CL = 50pf

tV

200

ns

 

Time

 

 

 

 

 

 

 

 

 

 

 

 

 

MISO Data Hold Time

tHO

0

ns

 

 

High Time

tSSH

200

ns

 

SS

 

SCK High Time

tSCKH

300

ns

 

SCK Low Time

tSCKL

300

ns

 

SCK Rise Time

20% to 70% VDD

tR

 

1

s

 

SCK Fall Time

20% to 70% VDD

tF

 

1

s

Note: When the host re-programs an address word with a Host-to-FLEXchip packet ID > 127 (decimal), there may be an added delay before FLEXchip is ready for another packet.

2-6

MC68175/D, Preliminary

MOTOROLA

Specifications

Serial Peripheral Interface (SPI) Timing

SS

READY

tRDY

tLEAD1

SCK

Tri-

MISO stated

tAC

MOSI

....

tSSH

 

....

 

tLEAD2

tLAG2

tRH

tCYC

 

 

tR

tLAG1

 

tF

 

 

....

 

tSCKL tSCKH

 

 

Tri-

 

....

stated

D31

D0

 

tV

tHO

tDIS

D31

....

D0

 

tHI

 

 

tSU

Figure 2-3 SPI Timing

MOTOROLA

MC68175/D, Preliminary

2-7

Specifications

Serial Peripheral Interface (SPI) Timing

2-8

MC68175/D, Preliminary

MOTOROLA

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