參數(shù)資料
型號(hào): OR3LP26B
英文描述: Field-Programmable System Chip (FPSC) Embedded Master/Target PCI Interface
中文描述: 現(xiàn)場(chǎng)可編程系統(tǒng)芯片(促進(jìn)文化基金)嵌入式主/目標(biāo)PCI接口
文件頁(yè)數(shù): 84/184頁(yè)
文件大?。?/td> 5590K
代理商: OR3LP26B
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ORCAOR3LP26B FPSC
Embedded Master/Target PCI Interface
Data Sheet
March 2000
84
L Lucent Technologies Inc.
PCI Bus Core Detailed Description Quad Port
(continued)
Understanding FIFO Packing/Unpacking
In quad-port mode, the interface from the core to the FPGA is always 32 bits wide. However, data packing through
the FIFOs will differ depending on whether the transfers on the PCI bus are 32 bits or 64 bits. The following discus-
sions pertain to target write or master read operations where data will be read from the FIFOs.
I
64-bit transfers
: Since the FIFOs are always in 64-bit mode, the data will flow through without any repacking.
Keep in mind that 64-bit transfers must start on a Quadword aligned address (AD2 = 0). Case 1 provides an
example of how the data is read out of the read side of the FIFO.
Case 1:
Master read burst, 64-bit. Quadword aligned starting address, even number of 64-bit words transferred on
the PCI bus.
Table 28. Quad-Port FIFO Packing/Unpacking, Case 1, PCI Side
Table 29. Dual-Port FIFO Packing/Unpacking, Case 1, FPGA Side
Note: PCI addresses in parentheses are not actually sent across the PCI bus during a burst. They are used for illustrative purposes only.
Dummy words are unknown data words in the FIFOs with their byte enables disabled.
I
32-bit transfers
: The FIFOs are always in 64-bit mode, so depending upon what address the transfer begins, the
data coming out of the FIFOs will be packed differently. The following two cases provide examples with different
starting addresses and word counts. Case 1 is also true for Master read operations.
Case 1:
Target write burst, 32-bit. Quadword aligned starting address, even number of 32-bit words transferred on
the PCI bus.
PCI Address
PCI Data
PCI Byte Enables
(Active-Low)
00000000
00000000
00000000
00000000
00000000
00000000
00001000
(00001008)
(00001010)
(00001018)
(00001020)
(00001028)
64-bit Word1
64-bit Word2
64-bit Word3
64-bit Word4
64-bit Word5
64-bit Word6
Master Write FIFO Slot
FIFO Data Bits [31:0]
FIFO Byte Enables
(Active-Low)
twdata[35:32]
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
twdata[31:0]
64-bit Word1 [31:0]
64-bit Word1 [63:32]
64-bit Word2 [31:0]
64-bit Word2 [63:32]
64-bit Word3 [31:0]
64-bit Word3 [63:32]
64-bit Word4 [31:0]
64-bit Word4 [63:32]
64-bit Word5 [31:0]
64-bit Word5 [63:32]
64-bit Word6 [31:0]
64-bit Word6 [63:32]
1
1
2
2
3
3
4
4
5
5
6
6
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