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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. See DBGDTR_EL0 for additional architectural mappings. It is a component of the Debug Communications Channel.

Configuration

AArch64 System register DBGDTRRX_EL0 bits [31:0] are architecturally mapped to AArch32 System register DBGDTRRXint[31:0] .

AArch64 System register DBGDTRRX_EL0 bits [31:0] are architecturally mapped to External register DBGDTRRX_EL0[31:0] .

This register is in the Cold reset domain. On a Cold reset RW fields in this register reset to architecturally UNKNOWN values. The register is not affected by a Warm reset.

Attributes

DBGDTRRX_EL0 is a 64-bit register.

Field descriptions

The DBGDTRRX_EL0 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
00000000000000000000000000000000
Update DTRRX
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

Bits [31:0]

Update DTRRX.

Reads of this register:

  • If RXfull is set to 1, return the last value written to DTRRX.

  • If RXfull is set to 0, return an UNKNOWN value.

After the read, RXfull is cleared to 0.

For the full behavior of the Debug Communications Channel, see The Debug Communication Channel and Instruction Transfer Register.

On a Cold reset, this field resets to an architecturally UNKNOWN value.

Accessing the DBGDTRRX_EL0

Accesses to this register use the following encodings:

MRS <Xt>, DBGDTRRX_EL0

op0CRnop1op2CRm
0b100b00000b0110b0000b0101
if PSTATE.EL == EL0 then
    if !ELUsingAArch32(EL1) && MDSCR_EL1.TDCC == '1' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.SystemAccessTrap(EL2, 0x18);
        else
            AArch64.SystemAccessTrap(EL1, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && (HCR_EL2.TGE == '1' || MDCR_EL2.<TDE,TDA> != '00') then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return DBGDTRRX_EL0;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return DBGDTRRX_EL0;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return DBGDTRRX_EL0;
elsif PSTATE.EL == EL3 then
    return DBGDTRRX_EL0;
              


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