5-4
BajaPPC-750: PMC/PCI Interface
The MPC106 registers are accessed through the BajaPPC-750 Configuration
Address and Data registers at FEC0,0000
16
and FEE0,0000
16
. To initiate an access,
write the value 0x8000,00
nn
(where
nn
is the MPC106 address of the register you
want to access) to the Configuration Address register at FEC0,0000
16
. Then the
data for that register may be read from or written to the Configuration Data regis-
ter at FEE0,0000
16
.
5.3.1 PCI Command Register
The PCI Command Register at hex offset 04
16
controls the MPC106 bridge’s abil-
ity to generate and respond to PCI cycles.
0C
1
R
Cache Line Size
08
0D
1
R
Latency Timer
00
0E
1
R
Header type
00
0F
1
R
BIST Control (Built-in self test)
00
3C
1
R
Interrupt Line
00
3D
1
R
Interrupt Pin
00
3E
1
R
MIN_GNT (Burst period length)
00
3F
1
R
MAX_GNT (PCI bus access rate)
00
40
1
R
MPC106 Bus Number Assignment
00
41
1
R/W
Subordinate Bus Number
00
42
1
R
Target Disconnect Timeout Counter
00
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Res.
RL
Reserved
FBB
SERR
Res.
PER
Res.
MWI
SC
BM
MS
IOS
Register Map 5-1. MPC106 PCI Command
RL
PCI force read lock (see MPC106 manual). 0=disable, 1=enable.
FBB
Fast back-to-back. Hardwired to zero (no fast back-to-back transactions).
SERR
SERR* driver enable. 0=disable, 1=enable.
PER
Parity error response enable. 0=disable, 1=enable.
MWI
Memory-write-invalidate. Hardwired to zero (no MWI command).
Table 5-1. MPC106 PCI Interface Configuration Registers —
Continued
MPC106
Hex Offset
Size in
Bytes
Access
Mode
Register Name
Hex
Default
Содержание BajaPPC-750
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Страница 4: ...BajaPPC 750 PowerPC Based Single Board Computer User s Manual May 2002...
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Страница 16: ...0002M621 15 ix Register Map 9 1 Counter Timer Status CTSR 9 2 Register Map 9 2 Counter Timer Mode CTMR 9 4...
Страница 19: ...xii BajaPPC 750 Contents...
Страница 57: ...3 12 BajaPPC 750 Central Processing Unit May 2002...
Страница 77: ...5 12 BajaPPC 750 PMC PCI Interface May 2002...
Страница 111: ...6 34 BajaPPC 750 VMEbus Interface May 2002...
Страница 135: ...8 18 BajaPPC 750 Serial and Parallel I O May 2002...
Страница 207: ...10 68 BajaPPC 750 Monitor May 2002...