Information
Arbiter and Bus Monitor
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 6-5
Table 6-3 describes ATR fields.
6.2.3 Arbiter Event Enable Register (AEER)
Arbiter event enable register (AEER) specifies, which kind of events are considered as error events. If
event is defined as non error event, it also won’t be reported neither in event register nor in event attributes
and address registers. For transfer types, that are not defined as error events, arbiter also does not end
address/data tenures. Figure 6-3 shows the fields of AEER.
Table 6-4 defines the bit fields of AEER.
Table 6-3. ATR Field Descriptions
Bits Name Description
0–15 DTO Data time out. Specifies the time-out period for the data tenure. The granularity of this field is128 bus clocks.
The maximum value is 8355840 coherent system bus clocks. Data time_out occurs if the data tenure does
not end before the specified time-out period. When DTO = n, the timeout cycle is n 128.
0000 Reserved
0001 128 clock cycles
0002 256 clock cycles
0003 384 clock cycles
...
FFFF 8355840 clock cycles
16–31 ATO Address time out. Specifies the time-out period for the address tenure. The granularity of this field is128 bus
clocks. Maximum value is 8355840 coherent system bus clocks. Address time-out occurs if the address
tenure did not end before the specified time-out period. When ATO = n, the timeout cycle is n 128.
0000 Reserved
0001 128 clock cycles
0002 256 clock cycles
0003 384 clock cycles
...
FFFF 8355840 clock cycles
Offset 0x08 Access: Read/Write
0 25 26 27 28 29 30 31
R
— ETEA RES ECW AO DTO ATO
W
Reset0000000 0 000000000000000 0 00 1 1 1 1 1 1
Figure 6-3. Arbiter Event Enable Register (AEER)
Table 6-4. AEER Bit Settings
Bits Name Description
0–25 — Write reserved, read = 0
26 ETEA External TEA
.
Specifies, whether assertion of TEA signal by one of the slaves is going be reported in arbiter event
registers.
0 Assertion of TEA
signal by one of the slaves is not reported in arbiter event registers.
1 Assertion of TEA
signal by one of the slaves is reported in arbiter event registers.