RapidIO II Intel® FPGA IP User Guide

ID 683444
Date 9/28/2020
Public
Document Table of Contents

6.2.2.6. LP-Serial Lane n Status 4

Table 104.  LP-Serial Lane n Status 4 — 0x220, 0x240, 0x260, 0x280
Field Bits Access Function Default
CMD [31] RW Indicates to the connected port that an emphasis update command is present: 1’b0: No request present. 1’b1: Request present. 1'b0
Impl Defined [30] RO Implementation defined. 1'b0
Receiver trained [29] RW When the lane receiver controls transmit or receive adaptive equalization, this bit indicates whether all adaptive equalizers controlled by the lane receiver are trained.
  • 1’b0: One or more adaptive equalizers are controlled by the lane receiver and at least one of those adaptive equalizers is not trained.
  • 1’b1: The lane receiver controls no adaptive equalizers, or all of the adaptive equalizers the receiver controls are trained.
1'b0
Scrambling/ descrambling enabled [28] RO Indicates whether scrambling/descrambling is turned on in the IP core.
  • 1’b0: Scrambling/descrambling is disabled.
  • 1’b1: Scrambling/descrambling is enabled. Control symbol and packet data characters are scrambled before transmission and descrambled when received.
1'b1
Tap(–1) status [27:26] RW Transmit emphasis Tap(–1) status:
  • 2’b00: Transmit emphasis Tap(–1) is not implemented.
  • 2’b01: Transmit emphasis Tap(–1) is at minimum emphasis 0.
  • 2’b10: Transmit emphasis Tap(–1) is at maximum emphasis.
  • 2’b11: Transmit emphasis Tap(–1) is at an intermediate emphasis setting.
2’b00
Tap(+1) status [25:24] RW Transmit emphasis Tap(+1) status:
  • 2’b00: Transmit emphasis Tap(+1) is not implemented.
  • 2’b01: Transmit emphasis Tap(+1) is at minimum emphasis 0.
  • 2’b10: Transmit emphasis Tap(+1) is at maximum emphasis.
  • 2’b11: Transmit emphasis Tap(+1) is at an intermediate emphasis setting.
2’b00
RSRV [23:8] RO Reserved. 16'h0000
Tap(–1) command [7:6] RW Transmit emphasis Tap(–1) update command. This field is active only when the CMD field has the value of 1.
  • 2’b00: Hold.
  • 2’b01: Decrease emphasis by one step.
  • 2’b10: Increase emphasis by one step.
  • 2’b11:Reserved.
2’b00
Tap(+1) command [5:4] RW Transmit emphasis Tap(+1) update command. This field is active only when the CMD field has the value of 1.
  • 2’b00: Hold.
  • 2’b01: Decrease emphasis by one step.
  • 2’b10: Increase emphasis by one step.
  • 2’b11:Reserved.
2’b00
Reset emphasis [3] RW Transmit emphasis reset command to the connected transceiver. This field is active only when the CMD field has the value of 1.
  • 2’b0: Ignore.
  • 2’b1: Reset all transmit emphasis taps to no emphasis.
1’b0
Preset emphasis [2] RW Transmit emphasis command to the connected transceiver to force initial or preset values. This field is active only when the CMD field has the value of 1.
  • 2’b0: Ignore.
  • 2’b1: Set all transmit emphasis settings to their preset values.
1’b0
ACK [1] RW Indicates that a transmit emphasis update command from the RapidIO link partner is being accepted:
  • 1’b0: Command not accepted.
  • 1’b1: Command accepted.
1’b0
NACK [0] RW Indicates that a transmit emphasis update command from the RapidIO link partner is being refused:
  • 1’b0: Command not refused.
  • 1’b1: Command refused.
1’b0

The RapidIO II IP core transmits the values in the LP-Serial Lane n Status 4 CSR on the outgoing CS field for lane n.

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