PCIe Accelerator-6D Card User Guide (UG074)
Speedster FPGAs
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Networking and Communications Interface
The four QSFP ports provide a primary high-speed networking data interface for the board, enabling the 10G
/40G capabilities of HD1000. For the data path, the four 40G QSFP ports together provide a total duplex
bandwidth of 320 Gb/s bandwidth (160 Gb/s transmit and 160 Gb/s receive). These ports can used to support
any of of the following Ethernet data rates:
1 × 100G (10 × 10G with split-out cables )
4 × 40G (4 QSFP transceiver modules)
16 × 10G (with split-out cables)
The four-port QSFP cage is directly connected to 16 bidirectional 12.5 G SerDes lanes. These are designated in
quads as SerDes CH0 [8:11], CH1 [16:19], CH2 [24:27], CH3 [28:31] as shown in the figure above. Table below
shows the pin assignment for the QSFP interface to the HD1000 SerDes pin.
Table 2:
Accelerator-6D Rev C QSFP Interface Pins
QSFP Module Pin Name
QSFP CH No./HD1000 SerDes No.
Pin on HD1000 (U1)
RIGHT_TX1_N
CH 0
8 - 11
B19
RIGHT_TX1_P
C19
RIGHT_TX2_N
A20
RIGHT_TX2_P
B20
RIGHT_TX3_N
C21
RIGHT_TX3_P
B21
RIGHT_TX4_N
B22
RIGHT_TX4_P
A22
RIGHT_RX1_N
E19
RIGHT_RX1_P
F19
RIGHT_RX2_N
F20
RIGHT_RX2_P
G20
RIGHT_RX3_N
E21
RIGHT_RX3_P
F21
RIGHT_RX4_N
F22
RIGHT_RX4_P
G22