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Figure 16: Erasing Memory in Bulk

This figure shows an example of the latency when the Altera ASMI Parallel IP core is executing the erase

memory in bulk command. The latency shown does not correctly reflect the true processing time. The

latency only shows the command.

Caution: This command erases the entire memory on the EPCS/EPCQ/EPCQ_L256 device, including

the configuration data portion. You must use this command with caution.

If the wren signal has a value of one, the IP core registers the bulk_erase signal at the rising edge

of the clkin signal. The IP core asserts the busy signal as soon as it receives the bulk_erase

signal. The busy signal remains asserted for as long as it takes to erase the entire EPCS/EPCQ/

EPCQ_L256 memory.

If the wren signal has a value of zero, then the IP core will not carry out the bulk_erase signal,

and the busy signal remains deasserted.

Also, if the memory regions are protected (you can set this in the EPCS/EPCQ/EPCQ_L256 status

illegal_erase port is then asserted for two clock cycles to indicate that the erase operation has

been cancelled.

Note:

If you keep both the wren and bulk_erase ports asserted while the busy signal is

deasserted after the IP core has finished erasing memory in bulk command, the IP

core re-registers the wren and bulk_erase signals as a value of one and carries out

another bulk erase operation. Therefore, before the IP core deasserts the busy

signal, you must deassert the wren and bulk_erase signals. This feature is not

available for EPCQ-L512 and EPCQ-L1024

Erase Memory in a Specified Die on the EPCQ-L512 and EPCQ-L1024 Device

Use the die_erase signal to instruct the IP core to erase memory in a specified die on the EPCQ-L512 or

EPCQ-L1024 device.

Erase Memory in a Specified Die on the EPCQ-L512 and EPCQ-L1024 Device

UG-ALT1005

2014.12.15

Altera Corporation

Altera ASMI Parallel IP Core User Guide

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Altera Active Serial Memory Interface Bedienungsanleitung Seite 32