Visible to Intel only — GUID: nik1398984259760
Ixiasoft
Visible to Intel only — GUID: nik1398984259760
Ixiasoft
16.6.5. Rate Match FIFO
Parameter |
Range |
Description |
---|---|---|
Enable RX rate match FIFO |
On/Off |
When you turn this option On, the PCS includes a FIFO to compensate for the very small frequency differences between the local system clock and the RX recovered clock. |
RX rate match insert/delete +ve pattern (hex) |
User-specified 20 bit pattern |
Specifies the +ve (positive) disparity value for the RX rate match FIFO as a hexadecimal string. |
RX rate match insert/delete -ve pattern (hex) |
User-specified 20 bit pattern |
Specifies the -ve (negative) disparity value for the RX rate match FIFO as a hexadecimal string. |
When you enable the simplified data interface and enable the rate match FIFO status ports, the rate match FIFO bits map to the high-order bits of the data bus as listed in the following table. This table uses the following definitions:
- Basic double width: The Standard PCS protocol mode GUI option is set to basic. The FPGA data width is twice the PCS data width to allow the fabric to run at half the PCS frequency.
- SerialTM RapidIO double width: You are implementing the Serial RapidIO protocol. The FPGA data width is twice the PCS data width to allow the fabric to run at half the PCS frequency.
Status Condition | Protocol | Mapping of Status Flags to RX Data | Value |
---|---|---|---|
Full | PHY IP Core for PCI Express (PIPE) Basic double width |
RXD[62:62] = rx_rmfifostatus[1:0], or RXD[46:45] = rx_rmfifostatus[1:0], or RXD[30:29] = rx_rmfifostatus[1:0], orRXD[14:13] = rx_rmfifostatus[1:0] |
2'b11 = full |
XAUI, GigE, Serial RapidIO double width | rx_std_rm_fifo_full | 1'b1 = full | |
All other protocols | Depending on the FPGA fabric to PCS interface width either: RXD[46:45] = rx_rmfifostatus[1:0], or RXD[14:13] = rx_rmfifostatus[1:0] |
2'b11 = full | |
Empty | PHY IP Core for PCI Express (PIPE) Basic double width |
RXD[62:62] = rx_rmfifostatus[1:0], or RXD[46:45] = rx_rmfifostatus[1:0], or RXD[30:29] = rx_rmfifostatus[1:0], orRXD[14:13] = rx_rmfifostatus[1:0] |
(2'b10) AND (PAD or EDB) PAD = K23.7 or 9'h1F7 EDB = K30.7 or 9'h1FE |
XAUI, GigE, Serial RapidIO double width | rx_std_rm_fifo_empty | 1'b1 = empty | |
All other protocols | Depending on the FPGA fabric to PCS interface width either: RXD[46:45] = rx_rmfifostatus[1:0], or RXD[14:13] = rx_rmfifostatus[1:0] |
(2'b10) AND (PAD or EDB) 16 PAD = K23.7 or 9'h1F7 EDB = K30.7 or 9'h1FE |
|
Insertion | Basic double width Serial RapidIO double width |
RXD[62:62] = rx_rmfifostatus[1:0], or RXD[46:45] = rx_rmfifostatus[1:0], or RXD[30:29] = rx_rmfifostatus[1:0], orRXD[14:13] = rx_rmfifostatus[1:0] |
2'b10 |
All other protocols | Depending on the FPGA fabric to PCS interface width either: RXD[46:45] = rx_rmfifostatus[1:0], or RXD[14:13] = rx_rmfifostatus[1:0] |
2'b10 | |
Deletion | Basic double width Serial RapidIO double width |
RXD[62:62] = rx_rmfifostatus[1:0], or RXD[46:45] = rx_rmfifostatus[1:0], or RXD[30:29] = rx_rmfifostatus[1:0], orRXD[14:13] = rx_rmfifostatus[1:0] |
2'b01 |
All other protocols | Depending on the FPGA fabric to PCS interface width either: RXD[46:45] = rx_rmfifostatus[1:0], or RXD[14:13] = rx_rmfifostatus[1:0] |
2'b01 |