參數(shù)資料
型號: OR4E10
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): 21/132頁
文件大?。?/td> 2667K
代理商: OR4E10
Preliminary Data Sheet
August 2000
Lucent Technologies Inc.
21
ORCA Series 4 FPGAs
Programmable Logic Cells
(continued)
5-5749(F)
Figure 13. Memory Mode Expansion Example—128 x 8 RAM
RD[7:0]
WE
WA[6:0]
RA[6:0]
CLK
WA
RA
WPE 1
WPE 2
WE
RD[7:4]
WD[7:4]
5
5
4
PLC
8
WD[7:0]
8
7
7
WA
RA
WPE 1
WPE 2
WE
RD[3:0]
WD[3:0]
5
5
4
PLC
WA
RA
WPE 1
WPE 2
WE
RD[7:4]
WD[7:4]
5
5
4
PLC
WA
RA
WPE 1
WPE 2
WE
RD[3:0]
WD[3:0]
5
5
4
PLC
RE
RE
4
RE
4
RE
4
RE
4
Supplemental Logic and Interconnect Cell
Each PLC contains a SLIC embedded within the PLC
routing, outside of the PFU. As its name indicates, the
SLIC performs both logic and interconnect (routing)
functions. Its main features are 3-statable, bidirectional
buffers, and a PAL-like decoder capability. Figure 14
shows a diagram of a SLIC with all of its features
shown. All modes of the SLIC are not available at one
time.
The ten SLIC inputs can be sourced directly from the
PFU or from the general routing fabric. SI[0:9] inputs
can come from the horizontal or vertical routing and
I[0:9} comes from the PFU outputs O[9:0]. These
inputs can also be tied to a logical 1 or 0 constant. The
inputs are twin-quad in nature and are segregated into
two groups of four nibbles and a third group of two
inputs for control.
Each input nibble groups also have
3-state capability; however, the third pair does not.
There is one 3-state control (TRI) for each SLIC, with
the capability to invert or disable the 3-state control for
each group of four BIDIs. Separate 3-state control for
each nibble-wide group is achievable by using the
SLICs decoder (DEC) output, driven by the group of
two BIDIs, to control the 3-state of one BIDI nibble
while using the TRI signal to control the 3-state of the
other BIDI nibble. Figure 15
shows the SLIC in buffer
mode with available 3-state control from the TRI and
DEC signals. If the entire SLIC is acting in a buffer
capacity, the DEC output may be used to generate a
constant logic 1 (VHI) or logic 0 (VLO) signal for gen-
eral use.
The SLIC may also be used to generate PAL-like AND-
OR with optional INVERT (AOI) functions or a decoder
of up to 10 bits. Each group of buffers can feed into an
AND gate (4-input AND for the nibble groups and
2-input AND for the other two buffers). These AND
gates then feed into a 3-input gate that can be config-
ured as either an AND gate or an OR gate. The output
of the 3-input gate is invertible and is output at the DEC
output of the SLIC. Figure 19 shows the SLIC in full
decoder mode.
The functionality of the SLIC is parsed by the two
nibble-wide groups and the 2-bit buffer group. Each of
these groups may operate independently as BIDI buff-
ers (with or without 3-state capability for the nibble-
wide groups) or as a PAL/decoder.
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