DBGDTRRX_EL0, Debug Data Transfer Register, Receive

The DBGDTRRX_EL0 characteristics are:

Purpose

Transfers data from an external debugger to the PE. For example, it is used by a debugger transferring commands and data to a debug target. It is a component of the Debug Communications Channel.

This register is part of the Debug registers functional group.

Usage constraints

This register is accessible as follows:

OffDLKOSLKSLKDefault
ErrorErrorErrorRORW

If EDSCR.ITE == 0 when the PE exits Debug state on receiving a Restart request trigger event, the behavior of any operation issued by a DTR access in memory access mode that has not completed execution is CONSTRAINED UNPREDICTABLE, and must do one of the following:

Configuration

External register DBGDTRRX_EL0 is architecturally mapped to AArch64 System register DBGDTRRX_EL0.

External register DBGDTRRX_EL0 is architecturally mapped to AArch32 System register DBGDTRRXint.

DBGDTRRX_EL0 is in the Core power domain. RW fields in this register reset to architecturally UNKNOWN values. These apply only on a Cold reset. The register is not affected by a Warm reset and is not affected by an External debug reset.

Attributes

DBGDTRRX_EL0 is a 32-bit register.

Field descriptions

The DBGDTRRX_EL0 bit assignments are:

313029282726252423222120191817161514131211109876543210
Update DTRRX

Bits [31:0]

Update DTRRX.

If RXfull is set to 0, then writes to this register update the value in DTRRX and set RXfull to 1.

Reads of this register return the last value written to DTRRX and do not change RXfull.

For the full behavior of the Debug Communications Channel, see 'The Debug Communication Channel and Instruction Transfer Register' in the ARM ARM, chapter H4.

When this register has an architecturally-defined reset value, this field resets to a value that is architecturally UNKNOWN.

Accessing the DBGDTRRX_EL0

DBGDTRRX_EL0 can be accessed through the external debug interface:

ComponentOffset
Debug 0x080



18/04/2017 17:00

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