參數(shù)資料
型號(hào): LFXP20E-5FN484C
廠商: LATTICE SEMICONDUCTOR CORP
元件分類: FPGA
中文描述: FPGA, 2464 CLBS, PBGA484
封裝: 23 X 23 MM, LEAD FREE, FPBGA-484
文件頁(yè)數(shù): 41/130頁(yè)
文件大?。?/td> 1312K
代理商: LFXP20E-5FN484C
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2-15
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Figure 2-17. PIC Diagram
In the LatticeXP family, seven PIOs or four (3.5) PICs are grouped together to provide two LVDS differential pairs,
one PIC pair and one single I/O, as shown in Figure 2-18.
Two adjacent PIOs can be joined to provide a differential I/O pair (labeled as “T” and “C”). The PAD Labels “T” and
“C” distinguish the two PIOs. Only the PIO pairs on the left and right edges of the device can be configured as
LVDS transmit/receive pairs.
One of every 14 PIOs (a group of 8 PICs) contains a delay element to facilitate the generation of DQS signals as
shown in Figure 2-19. The DQS signal feeds the DQS bus which spans the set of 13 PIOs (8 PICs). The DQS sig-
nal from the bus is used to strobe the DDR data from the memory into input register blocks. This interface is
designed for memories that support one DQS strobe per eight bits of data.
The exact DQS pins are shown in a dual function in the Logic Signal Connections table in this data sheet. Addi-
tional detail is provided in the Signal Descriptions table in this data sheet.
PIO B
PADA
"T"
PADB “C”
OPOS0
ONEG0
OPOS1
ONEG1
TD
INCK
INDD
INFF
IPOS0
IPOS1
CLK
CE
LSR
GSRN
CLKO
CLKI
CEO
CEI
PIO A
sysIO
Buffer
Control
Muxes
LSR
GSR
DQS
DDRCLKPOL
IOLD0
IOLT0
D0
DDRCLK
DI
IPOS1
IPOS0
INCK
INDD
INFF
D0
D1
TD
D1
DO
Tristate
Register Block
(2 Flip Flops)
Output
Register Block
(2 Flip Flops)
DDRCLK
Input
Register Block
(5 Flip Flops)
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