5 tx next address pcitnar(r) -mbar + 0x3810 – Freescale Semiconductor MPC5200B User Manual
Page 324
Registers
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
10-27
10.3.3.1.5
Tx Next Address PCITNAR(R) —MBAR + 0x3810
12
Retry abort
Enable
(RE)
User writes this bit high to enable CPU Interrupt generation in the case of retry abort
termination of a packet transmission. It may be desirable to mask CPU interrupts in the case
that Multi-Channel DMA is controlling operation, but in such a case software should poll the
status bits to prevent a possible lock-up condition.
13
Target Abort
Enable
(TAE)
User writes this bit high to enable CPU Interrupt generation in the case of target abort
termination of a packet transmission. It may be desirable to mask CPU interrupts in the case
that Multi-Channel DMA is controlling operation, but in such a case software should poll the
status bits to prevent a possible lock-up condition.
14
Initiator Abort
Enable
(IAE)
User writes this bit high to enable CPU Interrupt generation in the case of initiator abort
termination of a packet transmission. It may be desirable to mask CPU interrupts in the case
that Multi-Channel DMA is controlling operation, but in such a case software should poll the
status bits to prevent a possible lock-up condition.
15
Normal
termination
Enable (NE)
User writes this bit high to enable CPU Interrupt generation at the conclusion of a normally
terminated packet transmission. This may or may not be desirable depending on the nature
of program control by Multi-Channel DMA or the processor core.
16:31
Reserved
Unused. Software should write zero to these bits.
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Next_Address
W
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 lsb
R
Next_Address
W
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
Name
Description
0:31
Next_Address
This status register contains the next (unwritten) PCI address and is updated at the
successful completion of each PCI data beat. It represents a byte address and is updated
with the user-written Start_Add value whenever the Start_Add is reloaded. It is intended to
be accurate even in the case of abnormal terminations on the PCI bus.
Bits
Name
Description