Specifications

System Registers 7-139

Table 7-64 IDPMSR Register Bit Definitions

Name Bit(s) Type Function

RSVD

<31:2> R/W, 0 Reserved. Read as zeros.

HDR_LPBCK_EN

<1> R/W, 0 HDR Loopback Enable. When set, enables

the I/O port to internally loopback Mailbox

Command packets and Sparse Window Read

packets between the Down Hose and Up Hose.

When set, the ICR automatically disables all at-

tached I/O adapter modules by driving the hose

error signal (HOS_ERROR) on all Up Hoses.

Refer to the I/O port functional specification for

loopback programming details.

ENA_HOSE_VECT

<0> R/W, 0 Enable Hose onto Vector. If set, the number

of the hose that originated the interrupt is

stored in bits <15:14> of the TLILIDx register,

which contains the interrupt vector as follows:

If this bit is clear, the value in bits <15:14> of

the vector that is passed to the I/O port from the

originating hose will be stored in bits <15:14>

of the TLILIDx register.

TLILIDx<15:14> Hose Number