参数资料
型号: MPC8272ADS
厂商: Freescale Semiconductor
文件页数: 48/158页
文件大小: 0K
描述: KIT DEVELOPMENT MPC8272
标准包装: 1
类型: MPU
适用于相关产品: MPC8272
所含物品:
Reset and Reset Configuration
can be taken from the E2PROM/BCSR in case the Flash has been tampered with. The
selection between the BCSR, FLASH and the E2PROM as the source of the default
configuration word is determined by a dedicated dip-switch and a jumper.
During hard reset sequence, the configuration master 1 reads the Flash (or E 2 PROM or
BCSR) memory at addresses 0, 8, 0x18, 0x20,... a byte each time, to assemble the 32 bit
configuration word. A total of 64 bytes of data is read from D(0:7) to acquire 8 full
configuration words for system that may have up to 8 MPC8272 chips.
The configuration word for a single 2 MPC8272 is stored in the Flash memory SIMM, in
the E 2 PROM or as default in the BCSR, while the other seven words are not initialized, as
there are no additional MPC8272 on the MPC8272ADS. The default configuration word is
shown in Table 5-1 for the FLASH and in Table 5-2 for the E 2 PROM. PCI module
configuration is 256 Bytes long and should start at address 0x100.
The two possible configuration words are the following:
?
?
FLASH/BCSR is the boot device. CS0 is assigned to the FLASH and CS4 is
assigned to the E 2 PROM.
E 2 PROM is the boot device. CS0 is assigned to the E 2 PROM and CS4 is assigned
to the FLASH.
.
Table 5-1. BCSR/FLASH Hard Reset Configuration Word
Field
ERB
EXMC
Data
Bus
Bits
0
1
Prog
Value
[Bin]
’0’
’0’
Implication
Internal Arbitration Selected.
Internal Memory Controller. CS0 active at
Offset In
Flash
[Hex]
0
Value
[Hex]
0C
system boot.
CDIS
EBM
BPS
CIP
2
3
4:5
6
’0’
’0’
11
’0’
Core Enabled.
‘0’ - Single PowerQUICC II Mode
32 Bit Boot Port Size
Sets Core Initial Prefix MSR[IP]=1, so that
system exception table is placed at address
0xFFF00100 regardless of FLASH memory
size
ISPS
7
‘0’
64-bit internal space for external master
accesses. In fact don’t care on this board since
external master is not supported.
1 In
general, The MPC8272 for which RSTCONF is asserted along with PORST asserted or in particular,
the MPC8272 residing on the MPC8272ADS.
2 Although the MPC8272 as configuration master reads 8 configuration words, only the 1’st configuration
word is influential.
MPC8272ADS User Guide
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