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DBGDTRTXint, Debug Data Transfer Register, Transmit

The DBGDTRTXint characteristics are:

Purpose

Transfers data from the PE to an external debugger. For example, it is used by a debug target to transfer data to the debugger. See DBGDTR_EL0 for additional architectural mappings. It is a component of the Debug Communication Channel.

Configuration

AArch32 System register DBGDTRTXint bits [31:0] are architecturally mapped to AArch64 System register DBGDTRTX_EL0[31:0] .

AArch32 System register DBGDTRTXint bits [31:0] are architecturally mapped to External register DBGDTRTX_EL0[31:0] .

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

DBGDTRTXint is a 32-bit register.

Field descriptions

The DBGDTRTXint bit assignments are:

313029282726252423222120191817161514131211109876543210
Return DTRTX

Bits [31:0]

Return DTRTX.

Writes to this register:

  • If TXfull is set to 1, set DTRTX to UNKNOWN.

  • If TXfull is set to 0, update the value in DTRTX.

After the write, TXfull is set to 1.

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 DBGDTRTXint

Data can be loaded from memory into this register using LDC (immediate) and LDC (literal).

Accesses to this register use the following encodings:

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11100b0000b00000b01010b000
if PSTATE.EL == EL0 then
    if !Halted() && !ELUsingAArch32(EL1) && MDSCR_EL1.TDCC == '1' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.AArch32SystemAccessTrap(EL2, 0x05);
        else
            AArch64.AArch32SystemAccessTrap(EL1, 0x05);
    elsif !Halted() && ELUsingAArch32(EL1) && DBGDSCRext.UDCCdis == '1' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.AArch32SystemAccessTrap(EL2, 0x05);
        elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
            AArch32.TakeHypTrapException(0x00);
        else
            UNDEFINED;
    elsif !Halted() && EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TDCC == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x05);
    elsif !Halted() && EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TDCC == '1' then
        AArch32.TakeHypTrapException(0x05);
    elsif !Halted() && EL2Enabled() && !ELUsingAArch32(EL2) && (HCR_EL2.TGE == '1' || MDCR_EL2.<TDE,TDA> != '00') then
        AArch64.AArch32SystemAccessTrap(EL2, 0x05);
    elsif !Halted() && EL2Enabled() && !ELUsingAArch32(EL2) && (HCR.TGE == '1' || HDCR.<TDE,TDA> != '00') then
        AArch32.TakeHypTrapException(0x05);
    elsif !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDCC == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    elsif !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    elsif !Halted() && HaveEL(EL3) && ELUsingAArch32(EL3) && SDCR.TDCC == '1' then
        AArch32.TakeMonitorTrapException();
    else
        DBGDTRTXint = R[t];
elsif PSTATE.EL == EL1 then
    if !Halted() && EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TDCC == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x05);
    elsif !Halted() && EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TDCC == '1' then
        AArch32.TakeHypTrapException(0x05);
    elsif !Halted() && EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x05);
    elsif !Halted() && EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDA> != '00' then
        AArch32.TakeHypTrapException(0x05);
    elsif !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDCC == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    elsif !Halted() && HaveEL(EL3) && ELUsingAArch32(EL3) && SDCR.TDCC == '1' then
        AArch32.TakeMonitorTrapException();
    elsif !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    else
        DBGDTRTXint = R[t];
elsif PSTATE.EL == EL2 then
    if !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDCC == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    elsif !Halted() && HaveEL(EL3) && ELUsingAArch32(EL3) && SDCR.TDCC == '1' then
        AArch32.TakeMonitorTrapException();
    elsif !Halted() && HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    else
        DBGDTRTXint = R[t];
elsif PSTATE.EL == EL3 then
    if !Halted() && HaveEL(EL3) && ELUsingAArch32(EL3) && SDCR.TDCC == '1' then
        AArch32.TakeMonitorTrapException();
    else
        DBGDTRTXint = R[t];
              


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