參數(shù)資料
型號(hào)： LM9830VJD
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費(fèi)家電
英文描述： EuroDOCSIS 2.0 Diplexer Filter w/surge protection
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁數(shù)： 33/45頁
文件大?。?/td> 566K
代理商： LM9830VJD
33
http://www.national.com
The DataPort allows the user to select a memory block (gamma,
gain coefficient, or offset coefficient) and color (red, green, or
blue) to be read from or written to, by writing to Configuration
Register Address 3.
The starting address of that block (usually 0) is written into the
DataPort Address register (at Configuration Register Addresses 4
and 5). Bit D5 of register 4 should also be set to a 0 or a 1 to indi-
cate whether the DataPort will be read from (D5 = 1) or written to
(D5 = 0) in subsequent operations. This is required so the
LM9830 can prefetch the data for faster access. The DataPort
Address is automatically incremented after every byte of Gamma
data read/written, or every 2 bytes of Offset/Shading data
read/written (since an Offset/Shading word is 2 bytes wide).
Once the memory block, color, and starting address is written, a
series of reads or writes to the DataPort will read from or fill up
that selected memory block at maximum speed.
Registers 4 and 5 should always be (re)written to after register 3
has been changed.
5.1.1 DataPort Type and Color
These 3 bits determine which memory block (gamma or gain/off-
set coefficients, Figure 45) and which color of that memory block
(red, green, or blue, Figure 46) is to be read from or written to.
There is one exception to this: when operating the LM9830 in 1
Channel Mode A, the color is determined by the contents of Reg-
ister 26, bits 3 and 4.
5.1.2 DataPort Address
This 13 bit register (at Configuration Register addresses 4 and 5)
determines what the starting address is for the read/write opera-
tion. This address is automatically incremented after each
read/write operation to the actual DataPort.For the gamma table
the range is 0 to 1023. For the Gain and Offset Coefficients this
range is 0 (corresponding the first valid pixel as programmed in
the Valid Pixels Start register) to 2729 (the maximum number of
image pixels for a 300dpi sensor) or 5460 (the maximum number
of image pixels for a 600dpi sensor). If reads or writes continue
past 1023, 2729, or 5460, the DataPort address counter wraps
back around to 0 and continues counting. Note that for Gain and
Offset Coefficients it takes 2 read/write operations to increment
the address counter, because Gain and Offset Coefficients are
stored as a 2 byte word.
5.1.3 DataPort
This 8 bit register (at Configuration Register address 6) is where
the data is sequentially read from or written to. Gamma data is 8
bits wide. Since offset data may be 6 or 8 bits wide and gain cor-
rection data may be 10 or 8 bits wide, these bytes need to be
combined before they are transmitted. For a 6/10 offset/gain bit
split, the format is shown in Figure 47:
The first byte = Offset * 4 + INT(Gain/256), and
The second byte = Gain AND 255.
An 8/8 offset/gain split is more obvious:
If the offset/gain split is changed from 8/8 to 6/10, or from 6/10 to
8/8, the offset and gain coefficients must be re-calculated and
resent to the LM9830.
In Gamma mode, the DataPort address counter is automatically
incremented after a byte is read from or written to register 6. In
Gain/Offset mode, the DataPort address counter is automatically
incremented after two bytes are read from or written to register 6.
Reading and writing the DataPort should only be done when the
LM9830 is not scanning.
6.0 The Parallel Port Interface
The primary interface of the LM9830 is a PC compatible parallel
port interface. This communication mode is selected by tying the
CMODE pin to DGND. There are two operational parallel port
modes for reading data: Nibble Mode (for compatibility with the
maximum number of existing PCs) and EPP (for maximum speed
on newer machines). In addition, the LM9830 supports a printer
passthrough function that allows an LM9830-based scanner to be
inserted between a PC and a printer.
6.1 The Parallel Port Pins
The parallel port on a standard PC has a total of 17 I/O lines: 8
5
DataPort
Address
(LSB)
DataPort
b7 - b0
6
b7 - b0
7
6
5
4
3
2
1
0
Type
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
1
Gamma
Offset & Gain
Figure 45:
DataPort Target Pointer
7
6
5
4
3
2
1
0
Color
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
0
1
1
0
1
0
1
-
-
-
-
Red
Green
Blue
Undefined
Figure 46:
DataPort Color Pointer
Configuration
Register
Address
Name
Bits
Figure 44:
DataPort
7
6
5
4
3
2
1
0
Type
O5 O4 O3 O2 O1 O0 G9 G8
G7 G6 G5 G4 G3 G2 G1 G0
First Byte
Second Byte
Figure 47:
DataPort Target Pointer (6/10 split)
7
6
5
4
3
2
1
0
Type
O7 O6 O5 O4 O3 O2 O1 O0
G7 G6 G5 G4 G3 G2 G1 G0
First Byte
Second Byte
Figure 48:
DataPort Target Pointer (8/8 split)
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