SanDisk SD032 Manual descarregar pdf (Página 100)

5.2.5. Data Error Token

If a read operation fails and the card cannot provide the required data it will send a data error token, instead. This

token is one byte long and has the format shown in Figure 5-10.

Error

CC Error

Card ECC Failed

Out of Range

Card is Locked

000

Figure 5-10. Data Error Token

The four least significant bits (LSB) are the same error bits as in response format R2.

5.2.6. Clearing Status Bits

As described in the previous paragraphs, in SPI mode, status bits are reported to the host in three different formats:

response R1, response R2 and data error token (the same bits may exist in multiple response types—e.g., Card ECC

failed). As in the SD mode, error bits are cleared when read by the host, regardless of the response format.

5.3. Card Registers

In SPI Mode, only the OCR, CSD and CID registers are accessible. Their format is identical to their format in the

miniSD Card mode. However, a few fields are irrelevant in SPI mode.

5.4. SPI Bus Timing Diagrams

All timing diagrams use the schematics and abbreviations listed in Table 5-9.

Table 5-7. 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 5-9. 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.

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SanDisk SD032 Manual Página 100