Datasheet

Applications Information (Continued)

DS90C387/DS90CF388

The DS90C387A/CF388A chipset is electrically similar to the

DS90C387/CF388. The DS90C387/CF388 is intended for

improved support of longer cable drive. Cable drive is en-

hanced with a user selectable pre-emphasis feature that

provides additional output current during transitions to coun-

teract cable loading effects. Optional DC balancing on a

cycle-to-cycle basis, is also provided to reduce ISI (Inter-

Symbol Interference). With pre-emphasis and DC balancing,

a low distortion eye-pattern is provided at the receiver end of

the cable. A cable deskew capability has been added to

deskew long cables of pair-to-pair skew of up to +/−1 LVDS

data bit time (up to 80 MHz Clock Rate). These three en-

hancements allow cables 5+ meters in length to be driven

depending upon media and clock rate.

Configuration Table

TABLE 3. Transmitter / Receiver configuration table

Pin Condition Configuration

R_FB (Tx only) R_FB = V

Rising Edge Data Strobe

R_FB = GND Falling Edge Data Strobe

R_FDE (both Tx and Rx) R_FDE = V

Active data DE = High

R_FDE = GND Active data DE = Low

DUAL (Tx only) DUAL=V

48-bit color (dual pixel) support

DUAL=1/2V

Single-to-dual support

DUAL=Gnd 24-bit color (single pixel) support

DS90C387A/DS90CF388A