Altera Cyclone IV Device Handbook page 308

1–28
Figure 1–26. PLL Input Reference Clocks in Transceiver Operation for F484 and Larger Packages
(1) (2)
,
Notes to
(1) The REFCLK2 and REFCLK3 pins are dual-purpose CLKIO, REFCLK, or DIFFCLK pins that reside in banks 3A and 8A
respectively.
(2) The REFCLK[1..0] and REFCLK[5..4] pins are dual-purpose differential REFCLK or DIFFCLK pins that reside in
banks 3B and 8B respectively. These clock input pins do not have access to the clock control blocks and GCLK
networks. For more details, refer to the
(3) Using any clock input pins other than the designated REFCLK pins as shown here to drive the MPLLs and GPLLs may
have reduced jitter performance.
The input reference clocks reside in banks 3A, 3B, 8A, and 8B have dedicated
V
CC_CLKIN3A
their respective I/O banks to avoid the different power level requirements in the same
bank for general purpose I/Os (GPIOs).
for the REFCLK pins.
Table 1–6. REFCLK I/O Standard Support
HSSI
I/O Standard
Protocol
LVDS ALL
LVPECL ALL
ALL
1.2 V, 1.5 V,
ALL
3.3 V PCML
ALL
HCSL PCIe
Cyclone IV Device Handbook,
Volume 2
(3)
,
REFCLK[5..4]
MPLL_8
Transceiver
Block
GXBL1
MPLL_7
MPLL_6
Transceiver
Block
GXBL0
MPLL_5
REFCLK[1..0]
Figure 1–26:
, V , V
CC_CLKIN3B CC_CLKIN8A
Terminatio
Coupling
n
Off-chip
Differential
AC (Needs
Off-chip
off-chip
Off-chip
resistor to
Off-chip
restore
V )
Off-chip
CM
Differential
Off-chip
DC
Chapter 1: Cyclone IV Transceivers Architecture
REFCLK3
GPLL_2
Not applicable in
F484 package
GPLL_1
REFCLK2
Clock Networks and PLLs in Cyclone IV Devices
, and V
CC_CLKIN8B
Table 1–6 lists the supported I/O standard
VCC_CLKIN Level
Input Output Column I/O Row I/O
2.5 V Not Supported
2.5 V Not Supported
2.5 V Not Supported
2.5 V Not Supported
2.5 V Not Supported
2.5 V Not Supported
Transceiver Clocking Architecture
chapter.
power supplies separately in
I/O Pin Type
Supported
Banks
Yes No 3A, 3B, 8A, 8B
Yes No 3A, 3B, 8A, 8B
Yes No 3A, 3B, 8A, 8B
Yes No 3A, 3B, 8A, 8B
Yes No 3A, 3B, 8A, 8B
Yes No 3A, 3B, 8A, 8B
February 2015 Altera Corporation