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参数资料
| 型号： | LF2250QC25 |
| 厂商： | LOGIC DEVICES INC |
| 元件分类： | 数字信号处理外设 |
| 英文描述： | 12 x 10-bit Matrix Multiplier |
| 中文描述： | 12-BIT, DSP-MULTIPLIER, PQFP120 |
| 封装： | PLASTIC, QFP-120 |
| 文件页数： | 3/15页 |
| 文件大小： | 369K |
| 代理商： | LF2250QC25 |
DEVICES INCORPORATED
LF2250
12 x 10-bit Matrix Multiplier
Video Imaging Products
3
08/16/2000–LDS.2250-L
Cascade Out (Modes 01, 10, 11)
F
IGURE
1
A
.
I
NPUT
F
ORMATS
Data Input (All Modes)
Coefficient Input (All Modes)
Cascade Input (Modes 01, 10, 11)
Internal Sum (All Modes)
20 19 18
17
–2
11
2
10
2
9
2
8
(Sign)
15 14 13
–2
11
2
10
2
9
(Sign)
10
2
6
9
2
5
8
2
4
12 11
2
8
7
2
3
6
2
2
5
2
1
4
2
0
2
–1
2
–2
2
–3
2
–4
3
2
1
0
2
7
3
2
1
0
2
–6
2
–7
2
–8
2
–9
9
8
7
4
3
2
6
5
1
0
–2
0
2
–1
2
–2
(Sign)
2
–5
2
–6
2
–7
2
–3
2
–4
2
–8
2
–9
11 10 9
–2
11
2
10
2
9
(Sign)
6
2
6
5
2
5
4
2
4
8
2
8
7
2
7
3
2
3
2
2
2
1
2
1
0
2
0
F
IGURE
1
B
.
O
UTPUT
F
ORMATS
Result (Mode 00)
6
8
7
2
6
2
8
2
7
11 10 9
–2
11
2
10
2
9
(Sign)
5
2
5
4
2
4
3
2
3
2
2
2
1
2
1
0
2
0
15 14 13
–2
11
2
10
2
9
(Sign)
10
2
6
9
2
5
8
2
4
12 11
2
8
7
2
3
6
2
2
5
2
1
4
2
0
2
–1
2
–2
2
–3
2
–4
3
2
1
0
2
7
CASIN
15-0
— Cascade Input
In the filter modes (Modes 01, 10, 11),
the 12-bit X port and four bits of the Y
port are internally reconfigured as the
16-bit registered cascade input port.
Data presented to this port will be
added to the internal sum of prod-
ucts.
Outputs
X
11-0
, Y
11-0
, Z
11-0
— Data Outputs
X, Y, and Z are the 12-bit registered
output ports for the matrix multiply
mode (Mode 00). These ports are
automatically reconfigured for the
filter modes (Modes 01, 10, 11) as the
cascade-in and cascade-out ports.
CASOUT
15-0
— Cascade Output
In the filter modes (Modes 01, 10, 11),
the 12-bit Z port and four bits of the Y
port are internally reconfigured as the
16-bit registered cascade output port.
NOTE:
The X, Y, and Z ports are
automatically reconfigured by the LF2250
as the cascade-in and cascade-out ports as
required for each operating mode.
Because both the X and Z ports are used
for the cascade ports, all X port pins and
all Z port pins are labelled as XC and
ZC, respectively. All Y port pins that are
used for the cascade ports are labelled as
YC. Those Y port pins which are not
used for the cascade ports are labelled as
Y.
Controls
MODE
1-0
— Mode Select
The registered mode select inputs
determine the operating mode of the
LF2250 (Table 1) for data being input
on the next clock cycle. When switch-
ing between modes, the internal
pipeline latencies of the device must
be observed. After switching operat-
ing modes, the user must allow
enough clock cycles to pass to flush
the internal registers before valid data
will appear on the outputs.
CWE
1-0
— Coefficient Write Enable
The registered coefficient write enable
inputs determine which internal
coefficient register set to update
(Table 4) on the next clock cycle.
T
ABLE
3.
C
OEFFICIENT
I
NPUTS
INPUT PORT
REG. AVAILABLE
KA
KA1, KA2, KA3
KB
KB1, KB2, KB3
KC
KC1, KC2, KC3
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