EPC1 Altera Corporation, EPC1 Datasheet - Page 23

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

Altera Corporation
Power &
Operation
This section describes Power-On Reset (POR) delay, error detection, and
3.3-V and 5.0-V operation of Altera configuration devices.
Power-On Reset
During initial power-up, a POR delay occurs to permit voltage levels to
stabilize. When configuring an APEX II, APEX 20K, Mercury, ACEX 1K,
FLEX 10K, or FLEX 6000 device with an EPC4, EPC8, EPC16, EPC2, EPC1,
or EPC1441 device, the POR delay occurs inside the configuration device,
and the POR delay is a maximum of 200 ms. When configuring a
FLEX 8000 device with an EPC1213, EPC1064, or EPC1064V device, the
POR delay occurs inside the FLEX 8000 device, and the POR delay is
typically 100 ms, with a maximum of 200 ms.
Error Detection Circuitry
The EPC4, EPC8, EPC16, EPC2, EPC1, and EPC1441 configuration devices
have built-in error detection circuitry for configuring APEX II, APEX 20K,
Mercury, ACEX 1K, FLEX 10K, or FLEX 6000 devices only.
Built-in error-detection circuitry uses the nCS pin of the configuration
device, which monitors the CONF_DONE pin on the APEX II, APEX 20K,
Mercury, ACEX 1K, FLEX 10K, or FLEX 6000 device. An error condition
occurs if the CONF_DONE pin does not go high after all the configuration
data has been sent, or if the CONF_DONE pin goes high before the
configuration device has completed sending configuration data. When an
error condition occurs, the configuration device drives its OE pin low,
which drives the APEX II, APEX 20K, Mercury, ACEX 1K, FLEX 10K, or
FLEX 6000 device’s nSTATUS pin low, indicating an error. After an error,
configuration automatically restarts if the Auto-Restart Configuration on
Frame Error option is turned on in the Global Project Device Options
dialog box (Assign menu) in the MAX+PLUS II software. For APEX 20K,
APEX II, and Mercury devices, the Quartus II software provides a similar
option.
In addition, if the APEX II, APEX 20K, Mercury, ACEX 1K, FLEX 10K, or
FLEX 6000 device detects a cyclic redundancy code (CRC) error in the
received data, it may also flag the error by driving nSTATUS low. This low
signal on nSTATUS resets the configuration device, allowing
reconfiguration. CRC checking is performed when configuring all
APEX II, APEX 20K, Mercury, ACEX 1K, FLEX 10K, or FLEX 6000
devices.
Configuration Devices for SRAM-Based LUT Devices Data Sheet
23