Power Sequencing & Hot Socketing
The transmitter external clock output is transmitted on a data channel.
The txclkpin for each bank is located in between data transmitter pins.
For ×1 clocks (e.g., 622 Mbps, 622 MHz), the high-speed PLL clock
bypasses the SERDES to drive the output pins. For half-rate clocks (e.g.,
622 Mbps, 311 MHz) or any other even-numbered factor such as 1/4, 1/7,
1/8, or 1/10, the SERDES automatically generates the clock in the
Quartus II software.
For systems that require more than four or eight high-speed differential
I/O clock domains, a SERDES bypass implementation is possible using
IOEs.
Byte Alignment
For high-speed source synchronous interfaces such as POS-PHY 4, XSBI,
RapidIO, and HyperTransport technology, the source synchronous clock
rate is not a byte- or SERDES-rate multiple of the data rate. Byte
alignment is necessary for these protocols since the source synchronous
clock does not provide a byte or word boundary since the clock is one half
the data rate, not one eighth. The Stratix device’s high-speed differential
I/O circuitry provides dedicated data realignment circuitry for user-
controlled byte boundary shifting. This simplifies designs while saving
LE resources. An input signal to each fast PLL can stall deserializer
parallel data outputs by one bit period. You can use an LE-based state
machine to signal the shift of receiver byte boundaries until a specified
pattern is detected to indicate byte alignment.
Because Stratix devices can be used in a mixed-voltage environment, they
have been designed specifically to tolerate any possible power-up
sequence. Therefore, the VCCIOand VCCINTpower supplies may be
powered in any order.
Power
Sequencing &
Hot Socketing
Although you can power up or down the VCCIOand VCCINTpower
supplies in any sequence, you should not power down any I/O banks
that contain configuration pins while leaving other I/O banks powered
on. For power up and power down, all supplies (VCCINTand all VCCIO
power planes) must be powered up and down within 100 ms of each
other. This prevents I/O pins from driving out.
Signals can be driven into Stratix devices before and during power up
without damaging the device. In addition, Stratix devices do not drive
out during power up. Once operating conditions are reached and the
device is configured, Stratix devices operate as specified by the user. For
more information, see Hot Socketing in the Selectable I/O Standards in
Stratix & Stratix GX Devices chapter in the Stratix Device Handbook,
Volume 2.
2–140
Altera Corporation
Stratix Device Handbook, Volume 1
July 2005
ALTERA [ ALTERA CORPORATION ]
