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The RDBUFF register captures data from the AP, presented as the result of a previous read.
Access to this register is DATA LINK DEFINED. On JTAG-DP, Read Buffer is always RAZ/WI. On SW-DP, the behavior is as follows.
The RDBUFF register characteristics are:
The following figure shows the bit assignments.
The following table shows the bit assignments.
Table 9-15 RDBUFF register bit assignments
Performing a read of the Read Buffer captures data from the AP, presented as the result of a previous read, without initiating a new AP transaction. This means that reading the Read Buffer returns the result of the last AP read access, without generating a new AP access.
After you have read the DP Read Buffer, its contents are no longer valid. The result of a second read of the DP Read Buffer returns the result of last AP read access.