參數(shù)資料
型號: OR4E14
廠商: Lineage Power
英文描述: Field-Programmable Gate Arrays(現(xiàn)場可編程門陣列)
中文描述: 現(xiàn)場可編程門陣列(現(xiàn)場可編程門陣列)
文件頁數(shù): 25/132頁
文件大?。?/td> 2667K
代理商: OR4E14
Lucent Technologies Inc.
25
Preliminary Data Sheet
August 2000
ORCA Series 4 FPGAs
Programmable Logic Cells
(continued)
5-5748(F)
Figure 19. Decoder Mode
PLC Latches/Flip-Flops
The eight general-purpose latches/FFs in the PFU can
be used in a variety of configurations. In some cases,
the configuration options apply to all eight latches/FFs
in the PFU and some apply to the latches/FFs on a nib-
ble-wide basis where the ninth FF is considered inde-
pendently. For other options, each latch/FF is
independently programmable. In addition, the ninth FF
can be used for a variety of functions.
Table 7 summarizes these latch/FF options. The
latches/FFs can be configured as either positive- or
negative-level sensitive latches, or positive or negative
edge-triggered FFs (the ninth register can only be a
FF). All latches/FFs in a given nibble of a PFU share
the same clock, and the clock to these latches/FFs can
be inverted. The input into each latch/FF is from either
the corresponding LUT output (F[7:0]) or the direct data
input (DIN[7:0]). The latch/FF input can also be tied to
logic 1 or to logic 0, which is the default.
Table 7. Configuration RAM Controlled Latch/
Flip-Flop Operation
* Not available for FF[8].
Each PFU has two independent programmable clocks,
clock enable CE[1:0], local set/reset LSR[1:0], and
front-end data selects SEL[1:0]. When CE is disabled,
each latch/FF retains its previous value when clocked.
The clock enable, LSR, and SEL inputs can be inverted
to be active-low.
DEC
SIN7
LOGIC 1 OR 0
SIN6
LOGIC 1 OR 0
SIN5
LOGIC 1 OR 0
SIN4
LOGIC 1 OR 0
SIN9
LOGIC 1 OR 0
SIN8
LOGIC 1 OR 0
SIN3
LOGIC 1 OR 0
SIN1
LOGIC 1 OR 0
SIN2
LOGIC 1 OR 0
SIN0
LOGIC 1 OR 0
Function
Common to All Latches/FFs in PFU
Enable GSRN
GSRN enabled or has no effect on
PFU latches/FFs.
Set Individually in Each Latch/FF in PFU
Set/Reset Mode
Set or reset.
By Group (Latch/FF[3:0], Latch/FF[7:4], and FF[8])
Clock Enable
CE or none.
LSR Control
LSR or none.
Clock Polarity
Noninverted or inverted.
Latch/FF Mode
Latch or FF.
LSR Operation
Asynchronous or synchronous.
Front-end Select* Direct (DIN[7:0]) or from LUT
(F[7:0]).
LSR Priority
Either LSR or CE has priority.
Options
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