參數(shù)資料
型號： PLI9080
廠商： Electronic Theatre Controls, Inc.
英文描述： PCI I/O ACCELERATOR
中文描述： 的PCI I / O加速器
文件頁數(shù)： 14/133頁
文件大?。?/td> 883K
代理商： PLI9080
SECTION 2
PCI 9080
BUS OPERATION
PLX Technology, Inc., 1997
Page 6
Version 0.93
2. BUS OPERATION
2.1 PCI BUS CYCLES
The PCI 9080 is compliant with PCI Specification v2.1.
Refer to the PCI 2.1 spec for any specific features of
PCI Bus.
2.1.1 PCI Target Command Codes
As a target, the PCI 9080 allows access to the PCI 9080
internal registers and the local bus, using the commands
listed in Table 2-1.
Table 2-1. PCI Target Command Codes
Command Type
Code (C/BE[3:0]#)
I/O Read
0010 (2h)
I/O Write
0011 (3h)
Memory Read
0110 (6h)
Memory Write
0111 (7h)
Memory Read Multiple
1100 (Ch)
Memory Read Line
1110 (Eh)
Memory Write and Invalidate
1111 (Fh)
Configuration Read
1010 (Ah)
Configuration Write
1011 (Bh)
All read or write accesses to the PCI 9080 can be byte,
word or long word accesses. All memory commands are
aliased to the basic memory commands. All I/O
accesses to the PCI 9080 are decoded to a long word
boundary. The byte enables are used to determine
which bytes are read or written. An I/O access with
illegal byte enable combinations is terminated with a
Target Abort.
2.1.2 PCI Master Command Codes
The PCI 9080 can access the PCI bus to perform
DMA transfers or Direct Master Local to PCI Bus
transfers. During the Direct master or DMA transfer, the
command code assigned to the PCI 9080 internal
register location (PCI [6Ch])(Loc [ECh]) bits [15:0] will
be used as the PCI command code.
2.1.2.1 DMA Master Command Codes
The DMA controllers of the PCI 9080 can generate the
memory cycles listed in Table 2-2.
Table 2-2. DMA Master Command Codes
Command Type
Code (C/BE[3:0]#)
Memory Read
0110 (6h)
Memory Write
0111 (7h)
Memory Read Multiple
1100 (Ch)
Memory Read Line
1110 (Eh)
Memory Write and Invalidate
1111 (Fh)
2.1.2.2 Direct Local to PCI Command
Codes
For direct local to PCI bus accesses, the PCI 9080 can
generate the cycles listed in Table 2-3 through Table 2-
5.
Table 2-3. Local to PCI Memory Access
Command Type
Code (C/BE[3:0]#)
Memory Read
0110 (6h)
Memory Write
0111 (7h)
Memory Read Multiple
1100 (Ch)
Memory Read Line
1110 (Eh)
Table 2-4. Local to PCI I/O Access
Command Type
Code (C/BE[3:0]#)
I/O Read
0010 (2h)
I/O Write
0011 (3h)
Table 2-5. Local to PCI Configuration Access
Command Type
Code (C/BE[3:0]#)
Configuration Memory Read
1010 (Ah)
Configuration Memory Write
1011 (Bh)
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