Freescale Semiconductor MPC5200B ユーザーズマニュアル
XLB Arbiter Registers—MBAR + 0x1F00
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
16-5
NOTE
The PLDIS reset value is 1, which means the XLB Arbiter will prohibit transaction pipelining. In
most applications, transaction pipelining will provide a significant performance increase, and
therefore the customer should consider setting this bit to 0 to take advantage of this increase.
most applications, transaction pipelining will provide a significant performance increase, and
therefore the customer should consider setting this bit to 0 to take advantage of this increase.
16.2.2
Arbiter Version Register (R)—MBAR + 0x1F44
The Arbiter Version Register contains the silicon version number for the arbiter hardware.
16.2.3
Arbiter Status Register (R/W)—MBAR + 0x1F48
The Arbiter Status Register indicates the state of watchdog functions. When a monitored condition occurs, the respective bit is set to 1. The
bit remains 1 until cleared by writing 1 into that bit position. Even if the causal condition is removed, the bit remains set until cleared.
bit remains 1 until cleared by writing 1 into that bit position. Even if the causal condition is removed, the bit remains set until cleared.
25:26
PM[1:0]
Parking Mode.
00 = No parking (default).
01 = Reserved.
10 = Park on most recently used master.
11 = Park on programmed master as specifed by the Select Parked Master bits 21:23
above.
above.
27
—
Reserved
28
BA
Bus Activity Time-out Enable. If enabled, the arbiter will set the Bus Activity Time-out Status
bit (Arbiter Status Register, bit 29) when the Bus Activity Time-out is reached. Bus Activity
Time-out is derived from the Arbiter Bus Activity Time Out Count register.
bit (Arbiter Status Register, bit 29) when the Bus Activity Time-out is reached. Bus Activity
Time-out is derived from the Arbiter Bus Activity Time Out Count register.
29
DT
Data Tenure Time-out Enable. If enabled, the arbiter will assert TEA when the Data Tenure
Time-out is reached. Data Tenure Time-out is derived from the Arbiter Data Tenure Time
Out Count Register. Also, the arbiter will set the Data Tenure Time-out Status bit (Arbiter
Status Register, bit 30). Setting this bit will also enable the Address Tenure Time-out. This
is required to ensure that a data time-out will not occur before an address acknowledge.
Time-out is reached. Data Tenure Time-out is derived from the Arbiter Data Tenure Time
Out Count Register. Also, the arbiter will set the Data Tenure Time-out Status bit (Arbiter
Status Register, bit 30). Setting this bit will also enable the Address Tenure Time-out. This
is required to ensure that a data time-out will not occur before an address acknowledge.
30
AT
Address Tenure Time-out Enable. If enabled, the arbiter will assert AACK and TEA (if
required) when the Address Tenure Time-out is reached. Address Tenure Time-out is
derived from the Arbiter Address Tenure Time Out Count register. Also, the arbiter will set
the Address Tenure Time-out Status bit (Arbiter Status Register, bit 31). Address Tenure
Time-out is also enabled by the DT bit above.
required) when the Address Tenure Time-out is reached. Address Tenure Time-out is
derived from the Arbiter Address Tenure Time Out Count register. Also, the arbiter will set
the Address Tenure Time-out Status bit (Arbiter Status Register, bit 31). Address Tenure
Time-out is also enabled by the DT bit above.
31
—
Reserved
Table 16-2. Arbiter Version Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Version ID[0:15]
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
Version ID[16:31]
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Bit
Name
Description
0:31
VER
Hardware version ID. The current version number is 0x0001.
Bit
Name
Description