The format of the PSW is shown in Table 2.
Table 2: Format of the SSP PSW
Bit Hex Name Meaning
31 80000000 INTRP I/O INTERRUPT
30 40000000 EXCP EXCEPTION
29 20000000 T.O. I/O TIME-OUT
28 10000000 SS2 SS2, SS1 and SS0
27 08000000 SS1 indicate the FASTBUS SS code
26 04000000 SS0
25 02000000 BRQ BUS request by the SSP
24 01000000 EG Indicates a Primary Address cycle
23 00800000 AS/AK AS/AK lock was established
22 00400000 MS1 MS1 and MS0 indicate the FB MS code
21 00200000 MS0
20 00100000 RDOT Indicates a FASTBUS Read cycle.
19 00080000 WTOT Indicates that SSP was issuing Wait
18 00040000 EXCP2 EXCP2 and EXCP1
17 00020000 EXCP1 indicate the type of EXCEPTION
16 00010000 /NPA Next Prom Address
15 00008000 SMSK System Mask
14 00004000 OVMSK Overflow Mask
13 00002000 ECC2 ECC2 and ECC1
12 00001000 ECC1 Encoded Condition Codes
11 If EPM is disabled, bits 15:12
10 are the values of masks and
09 condition codes.
08
07 00000XXX If EPM is enabled, bits 15:12
06 indicate the upper 4 bits of the PC
05
04
03 Bits 11:0 indicate the PC
02 at the time the
01 I/O-Error handler was entered
00