EP4CGX75DF27C7N Altera, EP4CGX75DF27C7N Datasheet - Page 383

• 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

Chapter 2: Cyclone IV Reset Control and Power Down
Transceiver Reset Sequences
© December 2010 Altera Corporation
PCIe Initialization/Compliance Phase
After the device is powered up, a PCIe-compliant device goes through the compliance
phase during initialization. The rx_digitalreset signal must be deasserted
during this compliance phase to achieve transitions on the pipephydonestatus
signal, as expected by the link layer. The rx_digitalreset signal is deasserted
based on the assertion of the rx_freqlocked signal.
During the initialization/compliance phase, do not use the rx_freqlocked signal to
trigger a deassertion of the rx_digitalreset signal. Instead, perform the following
reset sequence:
1. After power up, assert pll_areset for a minimum period of 1 s (the time
2. After the multipurpose PLL locks, as indicated by the pll_locked signal going
3. Deassert both the rx_analogreset signal (marker 6) and rx_digitalreset
PCIe Normal Phase
For the normal PCIe phase:
1. After completion of the Initialization/Compliance phase, during the normal
2. Wait for the rx_freqlocked signal to go high again. In this phase, the received
3. After the rx_freqlocked signal goes high, wait for at least t
between markers 1 and 2). Keep the tx_digitalreset, rx_analogreset, and
rx_digitalreset signals asserted during this time period. After you deassert
the pll_areset signal, the multipurpose PLL starts locking to the input
reference clock.
high (marker 3), deassert tx_digitalreset. For a receiver operation, after
deassertion of busy signal, wait for two parallel clock cycles to deassert the
rx_analogreset signal. After rx_analogreset is deasserted, the receiver
CDR starts locking to the receiver input reference clock.
signal (marker 7) together, as indicated in
rx_digitalreset, the pipephydonestatus signal transitions from the
transceiver channel to indicate the status to the link layer. Depending on its status,
pipephydonestatus helps with the continuation of the compliance phase. After
successful completion of this phase, the device enters into the normal operation
phase.
operation phase at the Gen1 data rate, when the rx_freqlocked signal is
deasserted (marker 9 in
data is valid (not electrical idle) and the receiver CDR locks to the incoming data.
Proceed with the reset sequence after assertion of the rx_freqlocked signal.
asserting rx_digitalreset (marker 12 in
clock cycles so that the receiver phase compensation FIFO is initialized. For
bonded PCIe Gen 1 mode (×2 and ×4), wait for all the rx_freqlocked signals to
go high, then wait for t
clock cycles.
LTD_Manual
Figure
2–10).
before asserting rx_digitalreset for 2 parallel
Figure
Figure
2–10. After deasserting
2–10) for two parallel receive
Cyclone IV Device Handbook, Volume 2
LTD_Manual
before
2–17