lm4312 National Semiconductor Corporation, lm4312 Datasheet - Page 11

• Manufacturer Part Number: lm4312
• Description: Mobile Pixel Link Two Mpl-2 , Rgb Display Differential Interface Serializer With Optional Dithering And Look Up Table
• Manufacturer: National Semiconductor Corporation

PAGE WRITE
The PAGE WRITE is shown in Figure 16. The SPI_DI payload
consists of a "0" (Write Command), seven address bits of the
start address and then the consecutive data bytes. 256 bytes
maximum can be sent. The SPI_CSX signal is driven Low,
and the host drives the SDA signal with a "0" (Write Com-
mand), the seven start address bits and the variable length
data bytes. The Page Write is denoted by the SPI_CSX signal
Bit
DI
DI
B15
0
D7
(Data Byte 1)
B14
A6
(start address)
D6
B13
A5
D5
B12
A4
D4
FIGURE 12. LM4312 WRITE & READ to 3-signal SPI HOST
FIGURE 13. LM4312 WRITE & READ to 4-signal SPI HOST
B11
A3
D3
B10
A2
D2
B9
A1
D1
PAGE WRITE
B8
A0
D0
11
staying low while the data bytes are streamed. Data is latched
on the rising edge of the SPI_SCL.
There are four SPI Interface signals: SPI_CSX - SPI Chip
Select, SPI_SCL - SPI Clock, DI - SPI Data In and DO - SPI
Data Out. SPI_CSX, SPI_SCL and SPI_DI are inputs on the
LM4312. SPI_DO is the Data Output line for the READ_DATA
portion of a READ operation. READs are optional and are not
required.
B7
D7
(Data Byte 0)
D7
(Data Byte n, 256 max.)
B6
D6
D6
B5
D5
D5
B4
D4
D4
B3
D3
D3
B2
D2
D2
30011688
30011689
B1
D1
D1
www.national.com
B0
D0
D0