National Semiconductor DS90CF581 Manuals

DS90CF581�DS90CF582 LVDS 24-Bit Color Flat Panel Display (FPD) Link is a chipset released by National Semiconductor for connecting displays and motherboards. The chipset uses a 40MHz clock frequency to convert 28 bits of CMOS�TTL data into four LVDS data streams, and transmits the data through the fifth LVDS link to the display. DS90CF581 can transmit 40MHz clock signal and 4 LVDS data streams to the display, and DS90CF582 can convert the received 4 LVDS data streams to 28 bits of CMOS�TTL data stream and output the data to the motherboard. The chipset has low power consumption, low EMI and other features.

The DS90CF581 transmitter converts 28 bits of CMOS/TTL data into four LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth LVDS link. Every cycle of the transmit clock 28 bits of input data are sampled and transmitted. At a transmit clock frequency of 40 MHz, 24 bits of RGB data and 4 bits of LCD timing and control data (FPLINE, FPFRAME, DRDY, CNTL) are transmitted at a rate of 280 Mbps per LVDS data channel. Using a 40 MHz clock, the data throughput is 140 Megabytes per second. This transmitter is intended to interface to any of the FPD Link receivers. The chipset is an ideal means to solve EMI and cable size problems associated with wide, high speed TTL interfaces.