參數資料
型號: PCI2050GHK
英文描述: BUS CONTROLLER
中文描述: 總線控制器
文件頁數: 3/17頁
文件大小: 220K
代理商: PCI2050GHK
PCI2050A
PCI-to-PCI BRIDGE
SCPS067
MAY 2001
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
primary PCI system terminals
TERMINAL
NAME
I/O
DESCRIPTION
NO.
P_CLK
45
I
Primary PCI bus clock. P_CLK provides timing for all transactions on the primary PCI bus. All primary PCI signals
are sampled at rising edge of P_CLK.
P_RST
43
I
PCI reset. When the primary PCI bus reset is asserted, P_RST causes the bridge to put all output buffers in a
high-impedance state and reset all internal registers. When asserted, the device is completely nonfunctional.
During P_RST, the secondary interface is driven low. After P_RST is deasserted, the bridge is in its default state.
primary PCI address and data terminals
TERMINAL
NAME
I/O
DESCRIPTION
NO.
P_AD31
P_AD30
P_AD29
P_AD28
P_AD27
P_AD26
P_AD25
P_AD24
P_AD23
P_AD22
P_AD21
P_AD20
P_AD19
P_AD18
P_AD17
P_AD16
P_AD15
P_AD14
P_AD13
P_AD12
P_AD11
P_AD10
P_AD9
P_AD8
P_AD7
P_AD6
P_AD5
P_AD4
P_AD3
P_AD2
P_AD1
P_AD0
49
50
55
57
58
60
61
63
67
68
70
71
73
74
76
77
93
95
96
98
99
101
107
109
112
113
115
116
118
119
121
122
I/O
Primary address/data bus. These signals make up the multiplexed PCI address and data bus on the primary
interface. During the address phase of a primary bus PCI cycle, P_AD31
P_AD0 contain a 32-bit address
or other destination information. During the data phase, P_AD31
P_AD0 contain data.
P_C/BE3
P_C/BE2
P_C/BE1
P_C/BE0
64
79
92
110
I/O
Primary bus commands and byte enables. These signals are multiplexed on the same PCI terminals. During
the address phase of a primary bus PCI cycle, P_C/BE3
P_C/BE0 define the bus command. During the data
phase, this 4-bit bus is used as byte enables. The byte enables determine which byte paths of the full 32-bit
data bus carry meaningful data. P_C/BE0 applies to byte 0 (P_AD7
P_AD0), P_C/BE1 applies to byte 1
(P_AD15
P_AD8), P_C/BE2 applies to byte 2 (P_AD23
P_AD16), and P_C/BE3 applies to byte 3
(P_AD31
P_AD24).
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