SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual download pdf (Page 100)

SPI Protocol Definition

Table 5-4. SPI Bus Timing Abbreviations

H Signal is high (logical ‘1’)

L Signal is low (logical ‘0’)

X Don’t care

Z High impedance state (-> = 1)

* Repeater

Busy Busy Token

Command Command token

Response Response token

Data block Data token

All timing values are defined in Table 5-5. The host must keep the clock running for at least N

clock cycles after

the card response is received. This restriction applied to command and data response tokens.

5.4.1. Command/Response

Host Command to Card Response−Card is Ready

H H L L L * * * * * * * * * * * * * * * * * * * L L L L H H H

<-N

-> <-N

DataIN

X X H H H H 6 Bytes Command H H H H H * * * * * * * * * * * * * * * H H H H X X X

<-N

DataOut

Z Z Z H H H H * * * * * * * * H H H H H 1 or 2 Bytes Response H H H H H Z Z

Figure 5-11. Host Command to Card Response−Card is Ready

Host Command to Card Response−Card is Busy

The following timing diagram describes the command response transaction for commands when the card responses

which the R1b response type (e.g., SET_WRITE_PROT and ERASE). When the card is signaling busy, the host

may deselect it (by raising the CS) at any time. The card will release the DataOut line one clock after the CS going

high. To check if the card is still busy it needs to be reselected by asserting (set to low) the CS signal. The card will

resume busy signal (pulling DataOut low) one clock after the falling edge of CS.

H L L L * * * * * * * * * * * * * * * * * * * L L L L H H H L L L L L L H H

<-N

-> <-N

DataIN

X H H H H 6 Bytes Command H H H H H H H H H H H H H X X X H H H H H H X X

<-N

DataOut

Z Z H H H H * * * * * * * * H H H H Card Response Busy L Z Z Z Busy H H H H Z

Figure 5-12. Host Command to Card Response−Card is Busy

Card Response to Host Command

L L L L L * * * * * * * * * * * * * * * * * * * L L H H H H

DataIN

H H H H H H * * * * * * * * * * * * * H H H H 6 Bytes Command H H H X X X X

<-N

DataOut

H H H H H 1 or 2 Bytes Response H H H H * * * * * * * * * * * * * * * * * H H H H Z Z Z

Figure 5-13. Card Response to Host Command

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 118 119

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SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual Page 100

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