參數(shù)資料
型號: LFXP15C-4FN256C
廠商: LATTICE SEMICONDUCTOR CORP
元件分類: FPGA
中文描述: FPGA, 1932 CLBS, PBGA256
封裝: 17 X 17 MM, LEAD FREE, FPBGA-256
文件頁數(shù): 40/130頁
文件大?。?/td> 1312K
代理商: LFXP15C-4FN256C
2-14
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Figure 2-15. Memory Core Reset
For further information on sysMEM EBR block, see the details of additional technical documentation at the end of
this data sheet.
EBR Asynchronous Reset
EBR asynchronous reset or GSR (if used) can only be applied if all clock enables are low for a clock cycle before the
reset is applied and released a clock cycle after the reset is released, as shown in Figure 2-16. The GSR input to the
EBR is always asynchronous.
Figure 2-16. EBR Asynchronous Reset (Including GSR) Timing Diagram
If all clock enables remain enabled, the EBR asynchronous reset or GSR may only be applied and released after
the EBR read and write clock inputs are in a steady state condition for a minimum of 1/fMAX (EBR clock). The reset
release must adhere to the EBR synchronous reset setup time before the next active read or write clock edge.
If an EBR is pre-loaded during configuration, the GSR input must be disabled or the release of the GSR during
device Wake Up must occur before the release of the device I/Os becoming active.
These instructions apply to all EBR RAM and ROM implementations.
Note that there are no reset restrictions if the EBR synchronous reset is used and the EBR GSR input is disabled.
Programmable I/O Cells (PICs)
Each PIC contains two PIOs connected to their respective sysIO Buffers which are then connected to the PADs as
shown in Figure 2-17. The PIO Block supplies the output data (DO) and the Tri-state control signal (TO) to sysIO
buffer, and receives input from the buffer.
Q
SET
D
LCLR
Output Data
Latches
Memory Core
Port A[17:0]
Q
SET
D
Port B[17:0]
RSTB
GSRN
Programmable Disable
RSTA
LCLR
Reset
Clock
Enable
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