EP4CE55F23C8 Altera, EP4CE55F23C8 Datasheet - Page 195

• Manufacturer Part Number: EP4CE55F23C8
• Description: IC CYCLONE IV FPGA 55K 484FBGA
• Manufacturer: Altera
• Series: CYCLONE® IV Er

Specifications of EP4CE55F23C8

• Number Of Logic Elements/cells: 55856
• Number Of Labs/clbs: 3491
• Total Ram Bits: 2340000
• Number Of I /o: 324
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 484-FBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Configuration
© December 2010 Altera Corporation
Figure 8–11
interfaces to minimize signal integrity issues.
Figure 8–11. Balanced Star Routing
Notes to
(1) Altera recommends that M does not exceed 6 inches, as listed in
(2) Altera recommends using a balanced star routing. Keep the N length equal and as short as possible to minimize
Estimating AP Configuration Time
AP configuration time is dominated by the time it takes to transfer data from the
parallel flash to Cyclone IV E devices. This parallel interface is clocked by the
Cyclone IV E DCLK output (generated from an internal oscillator). The DCLK
minimum frequency when using the 40-MHz oscillator is 20 MHz (50 ns). In
word-wide cascade programming, the DATA[15..0] bus transfers a 16-bit word and
essentially cuts configuration time to approximately 1/16 of the AS configuration
time.
Equation 8–4.
Equation 8–5.
RBF Size
reflection noise from the transmission line. The M length is applicable for this setup.
Equation 8–4
Figure



maximum DCLK period
------------------------------------------------------ -
16 bits per DCLK cycle
shows the recommended balanced star routing for multiple bus master
8–11:
and
Master Device
Cyclone IV E
Equation 8–5
DCLK
9,600,000 bits


=
estimated maximum configuration time
show the configuration time calculations.

M (1)


50 ns
------------ -
16 bit


=
Table 8–9 on page
30 ms
Numonyx Flash
Master Device
External
Cyclone IV Device Handbook, Volume 1
N (2)
N (2)
8–27.
8–29