Idpmsr Register Bit Definitions - DEC AlphaServer 8200 Technical Manual

Table 7-64 IDPMSR Register Bit Definitions
Name
RSVD
HDR_LPBCK_EN
ENA_HOSE_VECT
Bit(s) Type Function
<31:2> R/W, 0 Reserved. Read as zeros.
<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.
<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>
00
01
10
11
Hose Number
0
1
2
3
System Registers 7-139