9 Read Buffer Register, RDBUFF

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:

Attributes
Offset

0x000C

Type

Read-only

Reset

0x00000000

Width

32

The following figure shows the bit assignments.

Figure 9-14 RDBUFF register bit assignments
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The following table shows the bit assignments.

Table 9-15 RDBUFF register bit assignments

Bits Reset value Name Function
[31:0] 0x0 RDATA

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After you have read the DP Read Buffer, its contents are no longer valid.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.

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