EP1S40B956C5 Altera, EP1S40B956C5 Datasheet - Page 414

• Manufacturer Part Number: EP1S40B956C5
• Description: IC STRATIX FPGA 40K LE 956-BGA
• Manufacturer: Altera
• Series: Stratix®r

Specifications of EP1S40B956C5

• Number Of Logic Elements/cells: 41250
• Number Of Labs/clbs: 4125
• Total Ram Bits: 3423744
• Number Of I /o: 683
• Voltage - Supply: 1.425 V ~ 1.575 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 956-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

DDR Memory Support Overview
3–18
Stratix Device Handbook, Volume 2
To generate the correct phase shift, you must provide a clock signal of the
same frequency as the DQS signal to the DQS phase-shift circuitry. Any
of the CLK[15..12]p clock pins can feed the phase circuitry on the top
of the device (I/O banks 3 and 4) and any of the CLK[7..4]p clock pins
can feed the phase circuitry on the bottom of the device (I/O banks 7
and 8). Both the top and bottom phase-shift circuits need unique clock
pins for the reference clock. You cannot use any internal clock sources to
feed the phase-shift circuitry, but you can route internal clock sources
off-chip and then back into one of the allowable clock input pins.
DLL
The DQS phase-shift circuitry uses a DLL to dynamically measure the
clock period needed by the DQS pin (see
phase-shift circuitry then uses the clock period to generate the correct
phase shift. The DLL in the Stratix and Stratix GX devices DQS phase-
shift circuitry can operate between 100 and 200 MHz. The phase-shift
circuitry needs a maximum of 256 clock cycles to calculate the correct
phase shift. Data sent during these clock cycles may not be properly
captured.
1
Note to
(1)
Table 3–4. Quartus II Reported Number on the DQS Path to the
IOE
Speed Grade
These are reported by Quartus II version 4.0. Check the latest version of the
Quartus II software for the most current information.
Note (1)
Table
-8
You can still use the DQS phase-shift circuitry for DDR SDRAM
interfaces that are less than 100 MHz. The DQS signal is shifted
by about 2.5 ns. This shifted DQS signal is not in the center of the
DQ signals, but it is shifted enough to capture the correct data in
this low-frequency application.
3–4:
DQ2IOE
1.293
Figure
DQS2IOE
1.635
3–9). The DQS
Altera Corporation
Unit
ns
June 2006