Stratix GX Architecture
clocking, programmable bandwidth, phase and delay control, and
dynamic PLL reconfiguration, the Stratix GX device’s enhanced PLLs
provide you with complete control of your clocks and system timing. The
fast PLLs provide general purpose clocking with multiplication and
phase shifting as well as high-speed outputs for high-speed differential
I/O support. Enhanced and fast PLLs work together with the Stratix GX
high-speed I/O and advanced clock architecture to provide significant
improvements in system performance and bandwidth.
The Quartus II software enables the PLLs and their features without
requiring any external devices. Table 4–17 shows which PLLs are
available for each Stratix GX device and their type. Table 4–18 shows the
enhanced PLL and fast PLL features in Stratix GX devices.
Table 4–17. Stratix GX Device PLL Availability
Fast PLLs
Enhanced PLLs
Device
1
2
3 (1) 4 (1)
7
8
9 (1) 10 (1) 5 (2) 6 (2) 11 (3) 12 (3)
EP1SGX10
EP1SGX25
EP1SGX40
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
Notes to Table 4–17:
(1) PLLs 3, 4, 9, and 10 are not available in Stratix GX devices. However, these PLLs are listed in Table 4–17 because
the Stratix GX PLL numbering scheme is consistent with Stratix devices.
(2) PLLs 5 and 6 each have eight single-ended outputs or four differential outputs.
(3) PLLs 11 and 12 each have one single-ended output.
Table 4–18. Stratix GX Enhanced PLL & Fast PLL Features (Part 1 of 2)
Notes (1)–(8)
Fast PLL
Feature
Enhanced PLL
Clock multiplication and division
Phase shift
m/ (n × post-scale counter) (1)
m/(post-scale counter) (2)
Down to 156.25-ps increments (3), Down to 125-ps increments (3), (4)
(4)
Delay shift
250-ps increments for 3 ns
Clock switchover
v
v
v
v
PLL reconfiguration
Programmable bandwidth
Spread spectrum clocking
Programmable duty cycle
Number of internal clock outputs
v
v
3 (5)
6
Altera Corporation
February 2005
4–77
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
