
Recommended Clock Frequency
Table 9-1: Recommended Clock Input Frequency For Each MegaCore Function Variant
Recommended Frequency
(MHz)
ClockMegaCore Function Variant
50–100CLK
10/100/1000-Mbps Ethernet MAC (with Internal FIFO
buffers)
125TX_CLK
125RX_CLK
100FF_TX_CLK
100FF_RX_CLK
50–100CLK
10/100/1000-Mbps Ethernet MAC (without Internal
FIFO buffers)
125TX_CLK <N>
125RX_CLK <N>
100RX_AFULL_CLK
50–100CLK
10/100/1000-Mbps Ethernet MAC with 1000BASE-
X/SGMII PCS (with Internal FIFO buffers)
100FF_TX_CLK
100FF_RX_CLK
125TBI_TX_CLK
125TBI_RX_CLK
125REF_CLK
37.5–50RECONFIG_CLK
(2)
125GXB_CAL_BLK_CLK
50–100CLK
10/100/1000-Mbps Ethernet MAC with 1000BASE-
X/SGMII PCS (without Internal FIFO buffers)
100RX_AFULL_CLK
125TBI_TX_CLK <N>
125TBI_RX_CLK <N>
125REF_CLK
37.5–50RECONFIG_CLK <N>
(2)
125GXB_CAL_BLK_CLK
(2)
This signal is only applicable to all device family prior to the 28-nm devices, which consists of the Stratix V,
Arria V, Arria V GZ, and Cyclone V devices.
Altera Corporation
Timing Constraints
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9-3
Recommended Clock Frequency
UG-01008
2014.06.30
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