8.3.2.1.1 Signal Detect Control for Datarates above 8 Gbps

Signal detect bandwidth limitations combined with high levels of signal attenuation can result in intermittent data loss above 8 Gbps. This data loss can be eliminated by disabling automatic detection and forcing the Signal Detect function to be always "on". This programming requires SMBus control over the DS125BR800 to be present. The Signal Detect function is controlled for each channel independently. The register programming sequence is shown below:

1. Write register 0x06 = 0x18 //* Enable SMBus register programming
2. Write registers 0x0D[1]= 1'b, 0x14[1] = 1'b, 0x1B[1] = 1'b, 0x22[1] = 1'b //* CH0 - CH3
3. Write registers 0x2A[1]= 1'b, 0x31[1] = 1'b, 0x38[1] = 1'b, 0x3F[1] = 1'b //* CH4 - CH7

NOTE: Automatic operation allows input to sense the incoming data-rate and utilize a "Transparent" output driver for operation at or above 8 Gbps.

NOTE: SAS/SATA up to 6 Gbps.