DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 160

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

5–44
Figure 5–39. PLL Reconfiguration Scan Chain
Notes to
(1) Stratix IV left and right PLLs support
(2) i = 6 or i = 9.
(3) This figure shows the corresponding scan register for the K counter in between the scan registers for the charge pump and loop filter. The K
Stratix IV Device Handbook Volume 1
scanclkena
configupdate
scandataout
counter is physically located after the VCO.
scandone
scandata
Figure
inclk
scanclk
5–39:
1
PLL Reconfiguration Hardware Implementation
The following PLL components are reconfigurable in real time:
■
■
■
■
■
Figure 5–39
shifting their new settings into a serial shift-register chain or scan chain. Serial data is
input to the scan chain using the scandata port. Shift registers are clocked by scanclk.
The maximum scanclk frequency is 100 MHz. Serial data is shifted through the scan
chain as long as the scanclkena signal stays asserted. After the last bit of data is
clocked, asserting the configupdate signal for at least one scanclk clock cycle causes
the PLL configuration bits to be synchronously updated with the data in the scan
registers.
The counter settings are updated synchronously to the clock frequency of the
individual counters. Therefore, all counters are not updated simultaneously.
from m counter
from n counter
/Ci (2)
Pre-scale counter (n)
Feedback counter (m)
Post-scale output counters (C0 - C9)
Post VCO Divider (K)
Dynamically adjust the charge-pump current (Icp) and loop-filter components
(R, C) to facilitate reconfiguration of the PLL bandwidth
C0 - C6
/Ci-1
shows how you can dynamically adjust the PLL counter settings by
counters.
(Note 1)
PFD
/C2
LF/K/CP (3)
/C1
Chapter 5: Clock Networks and PLLs in Stratix IV Devices
/C0
VCO
February 2011 Altera Corporation
/m
PLLs in Stratix IV Devices
/n