EP4SGX360FH29C3N Altera, EP4SGX360FH29C3N Datasheet - Page 261

• Manufacturer Part Number: EP4SGX360FH29C3N
• Description: IC STRATIX IV FPGA 360K 780HBGA
• Manufacturer: Altera
• Series: Stratix® IV GXr

Specifications of EP4SGX360FH29C3N

• Number Of Logic Elements/cells: 353600
• Number Of Labs/clbs: 14144
• Total Ram Bits: 22564
• Number Of I /o: 289
• Voltage - Supply: 0.87 V ~ 0.93 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 780-HBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Chapter 7: External Memory Interfaces in Stratix IV Devices
Stratix IV External Memory Interface Features
Figure 7–23. Simplified Diagram of the DQS Phase-Shift Circuitry
Notes to
(1) All features of the DQS phase-shift circuitry are accessible from the ALTMEMPHY megafunction in the Quartus II software.
(2) The input reference clock for the DQS phase-shift circuitry can come from a PLL output clock or an input clock pin. For more information, refer
(3) Phase offset settings can only go to the DQS logic blocks.
(4) DQS delay settings can go to the logic array, DQS logic block, and leveling circuitry.
February 2011 Altera Corporation
to
Input Reference
Table 7–5 on page 7–33
Clock (2)
Figure
7–23:
1
clk
DLL
Figure 7–23
into the DLL to a chain of up to 16 delay elements. The phase comparator compares
the signal coming out of the end of the delay chain block to the input reference clock.
The phase comparator then issues the upndn signal to the Gray-code counter. This
signal increments or decrements a six-bit delay setting (DQS delay settings) that
increases or decreases the delay through the delay element chain to bring the input
reference clock and the signals coming out of the delay element chain in phase.
In the Quartus II assignment, phase offset control block ‘A’ is designated as
DLLOFFSETCTRL_<coordinate x>_<coordinate y>_N1 and phase offset control block
‘B’ is designated as DLLOFFSETCTRL_<coordinate x>_<coordinate y>_N2.
You can reset the DLL from either the logic array or a user I/O pin. Each time the DLL
is reset, you must wait for 1,280 clock cycles for the DLL to lock before you can
capture the data properly.
Depending on the DLL frequency mode, the DLL can shift the incoming DQS signals
by 0°, 22.5°, 30°, 36°, 45°, 60°, 67.5°, 72°, 90°, 108°, 120°, 135°, 144°, 180°, or 240°. The
shifted DQS signal is then used as the clock for the DQ IOE input registers.
All DQS/CQ and CQn pins, referenced to the same DLL, can have their input signal
phase shifted by a different degree amount but all must be referenced at one
particular frequency. For example, you can have a 90° phase shift on DQS1T and a 60°
phase shift on DQS2T, referenced from a 200-MHz clock. Not all phase-shift
combinations are supported. The phase shifts on the DQS pins referenced by the same
DLL must all be a multiple of 22.5° (up to 90°), 30° (up to 120°), 36° (up to 144°), 45°
(up to 180°), or 60° (up to 240°).
Comparator
aload
through
Phase
Table 7–17 on page
Delay Chains
upndninclkena
upndnin
shows a simple block diagram of the DLL. The input reference clock goes
Up/Down
Counter
6
7–40.
6
offsetdelayctrlout [5:0]
offsetdelayctrlout [5:0]
delayctrlout [5:0]
dqsupdate
(Note 1)
offsetdelayctrlin [5:0]
offsetdelayctrlin [5:0]
6
DQS Delay
Settings
addnsub
addnsub
Phase offset settings
from the logic array
Phase offset settings
from the logic array
( offset [5:0] )
(4)
6
6
(dll_offset_ctrl_b)
(dll_offset_ctrl_a)
Control
Control
Phase
Phase
Offset
Offset
Stratix IV Device Handbook Volume 1
B
A
( offset [5:0] )
6
6
Phase offset
settings to DQS pin
on left or right edge (3)
( offsetctrlout [5:0] )
settings to DQS pins
on top or bottom edge (3)
Phase offset
( offsetctrlout [5:0] )
7–41