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參數(shù)資料
| 型號(hào)： | TMC2255 |
| 廠(chǎng)商： | Fairchild Semiconductor Corporation |
| 英文描述： | 8 x 8 Bits, 12 MHz Data Rate CMOS 3 x 3, 5 x 5 Image Convolver(8 x 8位,12 MHz CMOS 3 x 3, 5 x 5 圖像旋轉(zhuǎn)處理機(jī)) |
| 中文描述： | 8 × 8位，12MHz的數(shù)據(jù)速率的CMOS 3 × 3，5 × 5圖像卷積器（8 × 8位，12兆赫的CMOS 3 × 3，5 × 5圖像旋轉(zhuǎn)處理機(jī)） |
| 文件頁(yè)數(shù)： | 9/20頁(yè) |
| 文件大?。?/td> | 124K |
| 代理商： | TMC2255 |
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PRODUCT SPECIFICATION
TMC2255
9
Rounding
All computations are rounded internally following the final
accumulation of products. Rounding position depends on the
output format. If the user desires outputs with 1/2 LSB preci-
sion (relative to the inputs) then rounding is performed into
Z
–1
, just to the right of the LSB of the output port, Z
LSB precision, rounding is into Z
Z
11–1
only.
0
. For 1
0
, and the output is on pins
Table 3. Rounding
When E
00XXXXXX
01XXXXXX
1XXXXXXX
7–0
=
Outputs are
Z
11
–Z
0
Z
11
–Z
1
(11 bits)
Unchanged from
previous setting
Rounded at
Z
–1
Z
–0
(12 bits)
Output Limiting
When CLE = 0 and D = 0XXX1111, pins E
5–3
tell the chip
to which numerical format(s) to limit the emerging results.
Unsigned (UN), two’s complement (TC), and mixed data
formats of 8, 9, or 12 bits (including Z
0
) are supported, as
shown in Table 4. Limit “Z” applies to 3x3 and 5x5 convolu-
tional modes; limits Z1, Z2, Z3 apply to 3(3x1) mode.
Prior to output, the limiter (if enabled) tests the leading bits
of the emerging result. In the unsigned limit modes, if the
MSB = 1, denoting a negative value, the output is forced to
0; if the MSB = 0 but any other bit above the 8, 9, or 12 bit
output field = 1, the output is forced to 11111111111.1. In
the TC9 limit mode, values above 127.5 (00001111111.1)
are forced to 00001111111.1 and values below -128 become
11110000000.0. In the TC12 limit mode, values above
1023.5 (01111111111.1) are forced to 01111111111.1, and
values below -1024 become 10000000000.0. If full LSB
rounding (E
6
= 1) is used, output bit Z
0
is ignored, each data
format is correspondingly 1 bit narrower than shown in
Table 4, and the .5 fractions disappear from the range limits.
Table 2. Mode Selection
Coefficients are always 8-bit two’s complement.
When E
7–0
=
0XXXX000
0XXXX001
0XXXX010
0XXXX011
Z1 = A*K1,1 + B*K2,1 + C*K3,1
Z2 = A*K1,2 + B*K2,2 + C*K3,2
Z3 = A*K1,3 + B*K2,3 + C*K3,3
0XXXX100
0XXXX101
Z = A1*K1,1 + B1*K2,1 + C1*K3,1 +
A2*K1,2 + B2*K2,2 + C2*K3,2 +
A3*K1,3 + B3*K2,3 + C3*K3,3
0XXXX110
0XXXX111
Z = A1*K1,3 + B1*K2,3 + C1*K3,3 + D1*K2,3 + E1*K1,3 +
A2*K1,2 + B2*K2,2 + C2*K3,2 + D2*K2,2 + E2*K1,2 +
A3*K1,1 + B3*K2,1 + C3*K3,1 + D3*K2,1 + E3*K1,1 +
A4*K1,2 + B4*K2,2 + C4*K3,2 + D4*K2,2 + E4*K1,2 +
A5*K1,3 + B5*K2,3 + C5*K3,3 + D5*K2,3 + E5*K1,3
1XXXXXXX
Mode =
3 (3x1) mat mpy
3 (3x1) mat mpy
RESERVED—Do not use
3 (3x1) mat mpy
Data Formats
A
B
TC
TC
UN
TC
C
TC
TC
UN
First of 3 results
UN
UN
Last of 3 results
TC
TC
UN
UN
3x3 convolution
3x3 convolution
TC
UN
5x5 convolution
5x5 convolution
TC
UN
TC
UN
TC
UN
Unchanged from previous
setting
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