Type: Answers

Type: Errata

Area: Intellectual Property

Some Low Latency 40-100GbE IP Core Status Registers Are Not Readable


The following LL 40-100GbE IP core TX statistics and RX statistics status registers are not correctly readable in the IP core v14.1:

  • TXSTAT_REVID at offset 0x840
  • TXSTAT_SCRATCH at offset 0x841
  • TXSTAT_NAME_0, TXSTAT_NAME_1, and TXSTAT_NAME_2 at offsets 0x842-0x844
  • CNTR_TX_CONFIG at offset 0x845
  • CNTR_TX_STATUS at offset 0x846
  • RXSTAT_REVID at offset 0x940
  • RXSTAT_SCRATCH at offset 0x941
  • RXSTAT_NAME_0, RXSTAT_NAME_1, and RXSTAT_NAME_2 at offsets 0x942-0x944
  • CNTR_RX_CONFIG at offset 0x945
  • CNTR_RX_STATUS at offset 0x946


This issue has no workaround. Do not rely on the values you read from these registers.

This issue is fixed in version 15.1 of the Low Latency 40- and 100-Gbps Ethernet MAC and PHY IP core.