
8–16 Chapter 8: PHY IP Core for PCI Express (PIPE)
Register Interface and Register Descriptions
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
PCS for PCI Express
0x080 [31:0] RW
Lane or group number
Specifies lane or group number for indirect addressing,
which is used for all PCS control and status registers. For
variants that stripe data across multiple lanes, this is the
logical group number. For non-bonded applications, this
is the logical lane number.
0x081
[31:6] R Reserved —
[5:1] R
rx_bitslipboundary
selectout
Records the number of bits slipped by the RX Word
Aligner to achieve word alignment. Used for very latency
sensitive protocols.
From block: Word aligner.
[0] R
rx_phase_comp_fifo_error
When set, indicates an RX phase compensation FIFO
error.
From block: RX phase compensation FIFO.
0x082
[31:1] R Reserved —
[0] RW
tx_phase_comp_fifo_error
When set, indicates a TX phase compensation FIFO error.
From block: TX phase compensation FIFO.
0x083
[31:6] RW Reserved —
[5:1] RW
tx_bitslipboundary_select
Sets the number of bits the TX block needs to slip the
output. Used for very latency sensitive protocols.
From block: TX bit-slipper.
[0] RW
tx_invpolarity
When set, the TX channel inverts the polarity of the TX
data.
To block: Serializer.
0x084
[31:1] RW Reserved —
[0] RW
rx_invpolarity
When set, the RX channel inverts the polarity of the
received data. The 8B/10B decoder inverts the decoder
input sample and then decodes the inverted samples.
To block: 8B/10B decoder.
0x085
[31:4] RW Reserved —
[3] RW
rx_bitslip
When set, the word alignment logic operates in bitslip
mode. Every time this register transitions from 0 to 1, the
RX data slips a single bit.
To block: Word aligner.
[2] RW
rx_bytereversal_enable
When set, enables byte reversal on the RX interface.
To block: Word aligner.
[1] RW
rx_bitreversal_enable
When set, enables bit reversal on the RX interface.
To block: Word aligner.
[0] RW
rx_enapatternalign
When set, the word alignment logic operates in pattern
detect mode.
To block: Word aligner.
Table 8–11. PCI Express PHY (PIPE) IP Core Registers (Part 3 of 4)
Word
Addr
Bits R/W Register Name Description
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