参数资料
型号: MPC8272ADS
厂商: Freescale Semiconductor
文件页数: 64/158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:
PCI Bus
.
E 2 PROM Socket
DATA(0:7)
ADDRESS(17:31)
I/O(7:0)
A(14:0)
BCSR
POE
OE
CS0
CS4
E 2 PROM
CS
WE0
CS
WE
CE
Figure 5-7. E 2 PROM Connection Scheme
Additional address lines are connected to the socket according to the JEDEC format as an
option to use E 2 PROM up to 32 KByte.
5.9
PCI Bus
The MPC8272 has a PCI module which enables it to act as an host (Master) or a target. On
this board, the MPC8272 serves only as a PCI host - a bridge between the PCI Bus and the
PowerPC core.
The MPC8272 PCI Bridge is designed to connect the PowerPC processor and memory
system to the PCI system bus, to which I/O components are connected. The PCI Bridge
enables the MPC8272 to gluelessly bridge PCI masters and agents to a PowerPC system
host. It uses a 32-bit multiplexed, address/data bus that can run from 25MHz up to 66MHz.
The interface provides address and data parity with error checking and reporting. It also
provides three physical address spaces: 32-bit address memory; 32-bit address I/O; and the
PCI configuration space.
The MPC8272 also includes an on-chip arbiter which enables arbitration of up to three PCI
masters. Only three PCI slots are supported on the MPC8272ADS because of the Arbiter
capacity. Each slot can host either a PCI master or PCI target. The MPC8272 as a Bridge
can support more PCI devices but that will require extra slots that can host PCI targets only.
Therefore, to avoid dedicated slots for PCI targets, only three slots are implemented.
MPC8272ADS User Guide
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