IDT 89HPES64H16G2 User Manual page 293

IDT Switch Configuration and Status Registers
Bit Field
Field Name
25:23 TX_FSLEW_G2
26 TX_SLEW_C
28:27 TX_AMPBOOST
31:29 Reserved
PES64H16G2 User Manual
Default
Type
Value
RW 0x0 Transmit Driver Fine Slew Adjustment in Gen2. This field allows
SWSticky fine adjustment of the output driver's slew rate at Gen 2 data-rate,
for the lane(s) selected by the Lane Select (LANESEL[3:0]) field in
the SerDes Control (S[x]CTL) register.
This value is SWSticky for all lanes (i.e., even those not selected
by the LANESEL field in the S[x]CTL register).
RW 0x0 Transmit Slew Control Disable.
SWSticky When set, the slew control fields in this register (TX_SLEW_G1/2
and TX_FSLEW_G1/2) are disabled and the SerDes transmitter
uses its maximum slew rate setting.
RW 0x1 Transmit Driver Amplitude Boost. This field increases the trans-
SWSticky mitter driver's differential swing for the lane(s) selected by the Lane
Select (LANESEL[3:0]) field in the SerDes Control (S[x]CTL) regis-
ter.
Valid settings are 0x0 to 0x3, where 0x0 selects no amplitude
boost and 0x3 selects the highest amount of boost. Each increas-
ing setting boosts the amplitude by ~5% over the previous setting.
Increasing this setting will also increase the power consumed by
the affected lanes. Each increasing setting increases power con-
sumption by ~2% over the previous setting.
This value is SWSticky for all lanes (i.e., even those not selected
by the LANESEL field in the S[x]CTL register).
RO 0x0 Reserved field.
17 - 11
Description
April 5, 2013