EP3C16F256I7 Altera, EP3C16F256I7 Datasheet - Page 253

• Manufacturer Part Number: EP3C16F256I7
• Description: Cyclone III
• Manufacturer: Altera

Altera Corporation-Preliminary
March 2007
f
f
successfully exits POR, all user I/O pins continue to be tri-stated. The
user I/O pins and dual-purpose I/O pins have weak pull-up resistors
which are always enabled (after POR) before and during configuration.
The value of the weak pull-up resistors on the I/O pins that are on before
and during configuration can be found in the DC and Switching
Characteristics chapter of the Cyclone III Device Handbook.
The three stages of the configuration cycle are reset, configuration, and
initialization. While nCONFIG or nSTATUS are low, the device is in reset.
After POR, the Cyclone III devices release nSTATUS, which is pulled high
by an external 10 KΩ pull-up resistor, and enters configuration mode.
1
The serial clock (DCLK) generated by the Cyclone III device controls the
entire configuration cycle and provides the timing for the serial interface.
Cyclone III devices use an internal oscillator to generate DCLK.
Cyclone III devices use a 40 MHz oscillator. There is some variation in the
internal oscillator frequency because of the process, temperature, and
voltage conditions in Cyclone III devices. The internal oscillator is
designed such that its maximum frequency is guaranteed to meet EPCS
device specifications.
1
For information about serial configuration devices, refer to the Serial
Configuration Devices (EPCS1, EPCS4, EPCS16 and EPCS64) Data Sheet
chapter in volume 2 of the Configuration Handbook.
Table 10–7
Note to
(1)
Table 10–7. Active Serial DCLK Output Frequency
Oscillator
40 MHz
These values are preliminary.
Table
To begin configuration, power the V
the banks where the configuration and JTAG pins reside)
voltages to the appropriate voltage levels.
The EPCS1 device does not support any Cyclone III devices
because of its insufficient memory capacity.
shows the active serial DCLK output frequency.
10–7:
Active Serial Configuration (Serial Configuration Devices)
Minimum
20
Typical
Cyclone III Device Handbook, Volume 1
30
CCINT
Maximum
, V
40
Note (1)
CCA
, and V
Units
MHz
CCIO
10–17
(for