参数资料
型号: OR3T55-4PS240
元件分类: FPGA
英文描述: FPGA, 324 CLBS, 40000 GATES, 80 MHz, PQFP240
封装: SQFP-240
文件页数: 189/210页
文件大小: 2138K
代理商: OR3T55-4PS240
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8
Lucent Technologies Inc.
Preliminary Data Sheet, Rev. 1
ORCA Series 3 FPGAs
September 1998
Programmable Logic Cells
The programmable logic cell (PLC) consists of a pro-
grammable function unit (PFU), a supplemental logic
and interconnect cell (SLIC), and routing resources. All
PLCs in the array are functionally identical with only
minor differences in routing connectivity for improved
routability. The PFU, which contains eight 4-input LUTs,
eight latches/FFs, and one FF for logic implementation,
is discussed in the next section, followed by discus-
sions of the SLIC and PLC routing resources.
Programmable Function Unit
The PFUs are used for logic. Each PFU has 50 exter-
nal inputs and 18 outputs and can operate in several
modes. The functionality of the inputs and outputs
depends on the operating mode.
The PFU uses 36 data input lines for the LUTs, eight
data input lines for the latches/FFs, five control inputs
(ASWE, CLK, CE, LSR, SEL), and a carry input (CIN)
for fast arithmetic functions and general-purpose data
input for the ninth FF. There are eight combinatorial
data outputs (one from each LUT), eight latched/
registered outputs (one from each latch/FF), a carry-
out (COUT), and a registered carry-out (REGCOUT)
that comes from the ninth FF. The carry-out signals are
used principally for fast arithmetic functions.
Figure 2 and Figure 3 show high-level and detailed
views of the ports in the PFU, respectively. The eight
sets of LUT inputs are labeled as K0 through K7 with
each of the four inputs to each LUT having a suffix of
_x, where x is a number from 0 to 3. There are four F5
inputs labeled A through D. These inputs are used for a
fifth LUT input for 5-input LUTs or as a selector for mul-
tiplexing two 4-input LUTs. The eight direct data inputs
to the latches/FFs are labeled as DIN[7:0]. Registered
LUT outputs are shown as Q[7:0], and combinatorial
LUT outputs are labeled as F[7:0].
The PFU implements combinatorial logic in the LUTs
and sequential logic in the latches/FFs. The LUTs are
static random access memory (SRAM) and can be
used for read/write or read-only memory.
Each latch/FF can accept data from its associated LUT.
Alternatively, the latches/FFs can accept direct data
from DIN[7:0], eliminating the LUT delay if no combina-
torial function is needed. Additionally, the CIN input can
be used as a direct data source for the ninth FF. The
LUT outputs can bypass the latches/FFs, which
reduces the delay out of the PFU. It is possible to use
the LUTs and latches/FFs more or less independently,
allowing, for instance, a comparator function in the
LUTs simultaneously with a shift register in the FFs.
5-5752(F)
Figure 2. PFU Ports
The PFU can be configured to operate in four modes:
logic mode, half-logic mode, ripple mode, and memory
(RAM/ROM) mode. In addition, ripple mode has four
submodes and RAM mode can be used in either a
single- or dual-port memory fashion. These submodes
of operation are discussed in the following sections.
5-5752(F)
F5D
K7_0
K7_1
K7_2
K7_3
K6_0
K6_1
K6_2
K6_3
K5_0
K5_1
K5_2
K5_3
K4_0
K4_1
K4_2
K4_3
F5C
DIN7
DIN6
DIN5
DIN4
DIN3
DIN2
DIN1
DIN0
CIN
F5B
K3_0
K3_1
K3_2
K3_3
K2_0
K2_1
K2_2
K2_3
K1_0
K1_1
K1_2
K1_3
K0_0
K0_1
K0_2
K0_3
F5A
LSR
CLK
CE
SEL
ASWE
PROGRAMMABLE
FUNCTION UNIT
(PFU)
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
COUT
REGCOUT
F7
F6
F5
F4
F3
F2
F1
F0
相关PDF资料
PDF描述
OR3T80-4PS240I FPGA, 484 CLBS, 58000 GATES, 80 MHz, PQFP240
OR3T80-4PS240 FPGA, 484 CLBS, 58000 GATES, 80 MHz, PQFP240
OR3C80-4B432 FPGA, 484 CLBS, 58000 GATES, PBGA432
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相关代理商/技术参数
参数描述
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