EPC1 Altera Corporation, EPC1 Datasheet - Page 16

• Manufacturer Part Number: EPC1
• Description: Configuration EPROMs For Flex Devices
• Manufacturer: Altera Corporation

Configuration Devices for SRAM-based LUT Devices Data Sheet
Notes to
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Figure 7. Configuration Device Scheme Timing Waveform
Notes to
(1)
(2)
16
nINIT_CONF or VCC/nCONFIG
Do not use EPC2 devices to configure FLEX 6000 devices.
The pull-up resistor should be connected to the same supply voltage as the configuration device. All pull-up
resistors are 1 k
configurable 1-k
used on these pins. The Quartus II software uses the internal pull-up resistors by default. To turn off the internal
pull-up resistors, check the Disable nCS and OE pull-ups on configuration device option when generating programming
files.
The diagram shows an APEX II, APEX 20K, Mercury, ACEX 1K, or FLEX 10K device, which has MSEL0 and MSEL1
tied to ground. For FLEX 6000 devices, MSEL is tied to ground, and the DATA0 pin is named DATA. EPC2 cannot be
used with FLEX 6000 devices. All other connections are the same for FLEX 6000 devices.
EPC4, EPC8, and EPC16 devices cannot be cascaded.
The nINIT_CONF pin is only available on EPC2 devices and has an internal pull up of 1 k that is always active. If
nINIT_CONF is not available or not used, nCONFIG must be pulled to V
To ensure successful configuration between APEX 20KE and configuration devices in all possible power-up
sequences, pull up nCONFIG to V
This diagram is for APEX 20KE devices only.
To isolate the 1.8-V and 3.3-V power supplies when configuration APEX 20KE devices, add a diode between the
APEX 20KE device’s nCONFIG pin and the configuration device’s nINIT_CONF pin. Select a diode with a threshold
voltage (V
only be able to drive low or tri-state.
The configuration devivce will drive DATA low after configuration.
APEX II and APEX 20K devices (except EP2A70 devices) enter user mode 40 clock cycles after CONF_DONE goes
high. EP2A70 devices enter user mode 72 clock cycles after CONF_DONE goes high. FLEX 10K and FLEX 6000 devices
enter user mode 10 clock cycles after CONF_DONE goes high. Mercury devices enter user mode 136 clock cycles after
CONF_DONE goes high.
Figure
Figure
nCS/CONF_DONE
OE/nSTATUS
T
f
6:
7:
) less than or queal to 0.7 V. The diode will make the nINIT_CONF pin an open-drain pin; the pin will
INIT_DONE
User I/O
DCLK
DATA
(APEX 20KE pull-resistors are 10 k ). The OE and nCS pins on EPC2 devices have internal, user-
pull-up resistors. If internal pull-up resistors are used, external pull-up resistors should not be
t
OEZX
For more information on APEX 20K, ACEX 1K, FLEX 10K, or FLEX 6000
device configuration, see
APEX 20K, FLEX 10K & FLEX 6000
Figure 7
t
CO
t
Tri-State
t
CCINT
POR
DSU
D
0
shows the timing waveform for the configuration device scheme.
.
D
t
CL
1
D
t
2
DH
D
t
CH
3
Application Note 116 (Configuring ACEX 1K,
D
n
Tri-State
Devices).
CC
either directly or through a 1-k resistor.
(2)
User Mode
Altera Corporation
(1)