Table 3-6 Ram Data Register Bit Allocations; Table 3-7 Ram Read Pointer Register Bit Allocations; Ram Data Register, R4; Ram Read Pointer Register, R5 - ARM ETB11 Technical Reference Manual

3.2.5

3.2.6

ARM DDI 0275D

You can use the read-only RAM Data Register, while trace capture is disabled, to return

the contents of the ETB11 SRAM location addressed by the RAM Read Pointer

a RAM access cycle. Register bit allocations for the RAM Data Register are listed in

Table 3-6.

Caution

You cannot access the RAM Data Register while trace capture is enabled.

This register is not accessible from the AHB interface because the RAM is

memory-mapped. See Software access to the ETB11 using the AHB interface on

page 3-11.

This read/write register enables you to set and read the pointer used to read entries from

the RAM. Register bit allocations for the RAM Read Pointer Register are listed in

Table 3-7.

Note

is a constant used to define the width of the trace RAM address bus.

ETB_ADDR_WIDTH

When the RAM Read Pointer Register is written to, the read address updated

(ReadAddrUp) flag is activated. This initiates a RAM access.

Table 3-6 RAM Data Register bit allocations

Bit

number

[31:0]

Bit number

[31: ETB_ADDR_WIDTH]

[(ETB_ADDR_WIDTH-1):0]

Programmer's Model

Function

RAM data.

Returns the captured trace data.

Function

Reserved

RAM read pointer

3-7

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