EPC8 datasheet(23/36 Pages) ALTERA

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Altera Corporation

Configuration Devices for SRAM-Based LUT Devices Data Sheet

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.

EPC8 Datasheet(PDF) 23 Page - Altera Corporation