LF2250 LODEV [LOGIC Devices Incorporated], LF2250 Datasheet - Page 3

• Manufacturer Part Number: LF2250
• Description: 12 x 10-bit Matrix Multiplier
• Manufacturer: LODEV [LOGIC Devices Incorporated]

DEVICES INCORPORATED
CASIN
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.
F
F
IGURE
IGURE
15-0
(Sign)
(Sign)
–2
–2
15 14 13
15 14 13
1
1
— Cascade Input
A
11
B
11
. I
. O
2
2
10
10
(Sign)
(Sign)
NPUT
–2
–2
11 10 9
11 10 9
2
2
UTPUT
9
9
11
11
(Sign)
–2
12 11
12 11
2
2
2
2
9
(Sign)
Cascade Input (Modes 01, 10, 11)
–2
F
10
10
8
8
Cascade Out (Modes 01, 10, 11)
0
20 19 18
ORMATS
Coefficient Input (All Modes)
11
2
F
2
2
2
2
8
–1
7
Internal Sum (All Modes)
7
ORMATS
9
9
2
Data Input (All Modes)
10
2
10 9
10 9
2
2
2
2
7
8
8
–2
8
6
Result (Mode 00)
8
6
2
9
2
2
2
6
2
2
7
7
–3
7
7
5
17
5
2
8
2
5
2
2
2
2
–4
8
8
6
6
4
4
6
6
Outputs
X
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.
2
2
2
2
4
2
7
7
5
5
–5
11-0
3
3
5
2
5
3
–6
2
2
2
2
6
2
6
3
, Y
4
4
–6
2
2
4
4
2
2
–7
11-0
2
2
2
2
5
2
5
2
3
3
–7
1
1
3
3
2
1
, Z
–8
2
2
2
2
4
2
4
1
2
2
–8
0
0
11-0
2
2
2
0
–9
2
2
2
2
3
2
3
0
1
1
–9
–1
–1
— Data Outputs
1
1
3
2
2
2
2
2
2
0
0
–2
–2
0
0
2
2
1
1
–3
–3
2
2
0
0
–4
–4
12 x 10-bit Matrix Multiplier
CASOUT
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
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
The registered coefficient write enable
inputs determine which internal
coefficient register set to update
(Table 4) on the next clock cycle.
T
INPUT PORT
Video Imaging Products
ABLE
1-0
KA
KB
KC
1-0
— Coefficient Write Enable
3. C
15-0
— Mode Select
— Cascade Output
OEFFICIENT
REG. AVAILABLE
KA1, KA2, KA3
KB1, KB2, KB3
KC1, KC2, KC3
08/16/2000–LDS.2250-L
LF2250
I
NPUTS