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WT21-A-HCI

BLUETOOTH HCI MODULE

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7.1.5 CSPI Register Read Cycle

Burst reads have a programmable amount of padding data that is returned by the slave. 0-15

bytes are returned as defined in the BurstPadding register. Following this the Error byte is

returned followed by the data. Once the transfer has started, no further padding is needed.

A FIFO within SDIO_TOP will pre-fetch the data. The address is not retransmitted, and is auto-

updated within the slave.

The length field is transmitted if LengthFieldPresentin the Function 0 registers is set. In the

absence of a length field the CSB signal is used to indicate the end of the burst.

Figure 12: CSPI Burst Read Cycle

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