Motorola MPC8260 - Manual (Page 174)

4-36 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part II. ConÞguration and Reset
4.3.2.9 Software Service Register (SWSR)
The software service register (SWSR) is the location to which the software watchdog timer
servicing sequence is written. To prevent software watchdog timer time-out, the user should
write 0x556C followed by 0xAA39 to this register, which resides at 0x1000E. SWSR can
be written at any time, but returns all zeros when read.
4.3.2.10 60x Bus Transfer Error Status and Control Register 1
(TESCR1)
The 60x bus transfer error status and control register 1 (TESCR1) is shown in Figure 4-31.
Table 4-15 describes TESCR1 Þelds.
Bits 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field BM ISBE PAR ECC2 ECC1 WP EXT TC Ñ TT
Reset 0000_0000_0000_0000
R/W R/W
Addr 0x10040
Bits 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Field Ñ DMD Ñ ECNT
Reset 0000_0000_0000_0000
R/W R/W
Addr 0x10042
Figure 4-31. The 60x Bus Transfer Error Status and Control Register 1 (TESCR1)
Table 4-15. TESCR1 Field Descriptions
Bits Name Description
0 BM 60x bus monitor time-out. Set when TEA is asserted due to the 60x bus monitor time-out.
1 ISBE Internal space bus error. Indicates that TEA was asserted due to error on a transaction to MPC8260Õs
internal memory space. TESCR2[REGS, DPR] indicate which of MPC8260Õs internal slaves caused
the error.
2 PAR 60x bus parity error. Indicates that TEA was asserted due to parity error on the 60x bus. TESCR2[PB]
indicates which byte lane caused the error; TESCR2[BNK] indicates which memory controller bank
was accessed.
3 ECC2 Double ECC error. Indicates that TEA was asserted due to double ECC error on the 60x bus.
TESCR2[BNK] indicates which memory controller bank was accessed.
4 ECC1 Single ECC error. Indicates that TEA was asserted due to single bit ECC error on the 60x bus.
TESCR2[BNK] indicates which memory controller bank was accessed. Single-bit errors are usually
Þxed by the ECC logic. However, if the ECC counter (ECNT) has reached its maximum value, all
single-bit errors cause the assertion of TEA.
5 WP Write protect error. Indicates that a write was attempted to a 60x bus memory region that was deÞned
as read-only in the memory controller. Note that this alone does not cause TEA assertion. Usually, in
this case, the bus monitor will time-out.