EP4CGX75DF27C7N Altera, EP4CGX75DF27C7N Datasheet - Page 98

• Manufacturer Part Number: EP4CGX75DF27C7N
• Description: Cyclone IV GX
• Manufacturer: Altera
• Series: CYCLONE® IV GXr

Specifications of EP4CGX75DF27C7N

• Number Of Logic Elements/cells: 73920
• Number Of Labs/clbs: 4620
• Total Ram Bits: 4257792
• Number Of I /o: 310
• Number Of Gates: -
• Voltage - Supply: 1.16 V ~ 1.24 V
• Mounting Type: *
• Operating Temperature: 0°C ~ 85°C
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5–36
Figure 5–22. PLL Reconfiguration Scan Chain
Cyclone IV Device Handbook, Volume 1
scanclkena
configupdate
scandataout
scandone
scandata
inclk
scanclk
1
The counter settings are updated synchronously to the clock frequency of the
individual counters. Therefore, not all counters update simultaneously.
To reconfigure the PLL counters, perform the following steps:
1. The scanclkena signal is asserted at least one scanclk cycle prior to shifting in
2. Serial data (scandata) is shifted into the scan chain on the second rising edge of
3. After all 144 bits have been scanned into the scan chain, the scanclkena signal is
4. The configupdate signal is asserted for one scanclk cycle to update the PLL
5. The scandone signal goes high indicating that the PLL is being reconfigured. A
6. Reset the PLL using the areset signal if you make any changes to the M, N,
7. You can repeat steps
from M counter
from N counter
/C4
the first bit of scandata (D0).
scanclk.
de-asserted to prevent inadvertent shifting of bits in the scan chain.
counters with the contents of the scan chain.
falling edge indicates that the PLL counters have been updated with new settings.
post-scale output C counters, or the I
/C3
1
PFD
through
/C2
5
to reconfigure the PLL any number of times.
LF/K/CP
CP
Chapter 5: Clock Networks and PLLs in Cyclone IV Devices
/C1
, R, C settings.
/C0
VCO
© December 2010 Altera Corporation
/M
F
PLL Reconfiguration
VCO
/N