Gclk Network Clock Source Generation - Altera Cyclone IV Device Handbook

5–12

GCLK Network Clock Source Generation

Figure
inputs, and clock control block location for different Cyclone IV device densities.
Figure 5–2. Clock Networks and Clock Control Block Locations in EP4CGX15, EP4CGX22, and EP4CGX30 Devices
PLL_2
5
Clock
HSSI Control
Block (3)
5
PLL_1
Notes to Figure 5–2:
(1) The clock networks and clock control block locations apply to all EP4CGX15, EP4CGX22, and EP4CGX30 devices except EP4CGX30 device in F484
package.
(2) PLL_1 and PLL_2 are multipurpose PLLs while PLL_3 and PLL_4 are general purpose PLLs.
(3) There are five clock control blocks on each side.
(4) PLL_4 is only available in EP4CGX22 and EP4CGX30 devices in F324 package.
(5) The EP4CGX15 device has two DPCLK pins on three sides of the device: DPCLK2 and DPCLK5 on bottom side, DPCLK7 and DPCLK8 on the right
side, DPCLK10 and DPCLK13 on the top side of device.
(6) Dedicated clock pins can feed into this PLL. However, these paths are not fully compensated.
Cyclone IV Device Handbook,
Volume 1
5–2, Figure 5–3, and Figure 5–4 on page 5–14
DPCLK[13..12] (5) DPCLK[11..10] (5)
CLK[11..8]
2 2
4
4
5
Clock
Control
Block (3)
GCLK[19..0]
20
20 20
20
GCLK[19..0]
Clock
Control
Block (3)
5
4
4
2 2
CLK[15..12]
DPCLK[3..2] (5) DPCLK[5..4] (5)
Chapter 5: Clock Networks and PLLs in Cyclone IV Devices
show the Cyclone IV PLLs, clock
4 (4)
(6)
PLL_4
5
4
5
Clock
Control
Block (3)
4
5
5
PLL_3
4 (6)
Clock Networks
(1), (2)
DPCLK[9..8] (5)
2
CLK[7..4]
4
DPCLK[7..6] (5)
2
October 2012 Altera Corporation