Input Ports

addr[]

Yes

Input port used to specify which address to read, write, and/or erase.

Input port [23..0] wide.

bulk_erase

No

Active-high input port used to erase all memory in the EPCS device.

If asserted high, the altasmi_parallel Altera^® IP performs a full erase operation that sets all memory bits of the EPCS device to1. The bulk_erase port erases the entire memory of the EPCS device, which includes the general purpose (unused) memory.

clkin

Yes

Input clock for the ASMI block.

The maximum frequency for the clkin port is 20MHz for EPCS1 and EPCS4 devices (based on the EPCS device's maximum clock frequency). If the fast_read port is used with an EPCS16 or EPCS64 device, you can use a maximum frequency of 40 MHz for the clkin port.

datain[]

No

Input port for write and sector-protection operations.

Input port [7..0] wide.

rden

Yes

Active-high input port used with the read port or fast_read port to continue reading the sequential addresses.

The sequential address can be read for as long as the rden port is high.

read

Yes

Active-high input port that reads the memory address specified by the addr[] port.

The data byte that is read appears on the dataout[] output port. If a write or erase operation is in progress (busy port is high), the read instruction is ignored. You can use both single-byte read and sequential read. You must use the read port with the rden port.

fast_read

No

Active-high input port that reads the memory address specified by the addr[] port.

The fast_read port allows you to use a frequency over 20 MHz on the clkin port for EPCS16 and EPCS64 devices. The data byte read that is read appears on the dataout[] output port. You can use both single-byte fast_read and sequential fast_read. If a write or erase operation is in progress (busy port is high), fast_read is ignored. Use the fast_read port with the rden input port.

read_sid

No

Active-high input port that reads the silicon ID of the EPCS device.

The 8-bit silicon ID appears on the epcs_id output bus. Once read, the bus holds the value of the silicon ID until the device is reset. Not supported with EPCS128 devices.

read_status

No

Active-high input port that reads the EPCS status register and outputs the 8-bit binary value to the status_out[] port when asserted high.

The read_status port can be used to determine which sectors are read-only.

sector_erase

No

Active-high input port that erases sector data.

When asserted high, the Altera^® IP performs a sector erase operation. The addr[] port indicates the sector that is erased by the sector_erase port. The address at addr[] port can be any valid address in the sector that is to be erased by the sector_erase command.

sector_protect

No

Active-high input port used that protects the memory sectors on the EPCS device.

When asserted high, the Altera^® IP takes the value of the datain[] port and writes the EPCS status register with the specified value. The tables below list the values for sector protection:

shift_bytes

No

Port used to shift data bytes.

If you use page-write mode, you must use the shift_bytes port with the write port. If this port is set to 1, the Altera^® IP samples the datain[] port at the rising clkin port clock edge and as the data bytes shift through the datain[] port. This byte shifting continues until all of the bytes written into the EPCS device have been sampled and stored internally by the Altera^® IP.

wren

No

Enables write and erase operations to the memory of the EPCS device.

When wren=1, write operations and erase operations are enabled. When wren=0, write operations and erase operations are disabled.

If the wren port is not used, all writes and erases are automatically enabled each time a write or erase instruction is sent to the Altera^® IP.

The wren port is used together with the write, sector_protect, bulk_erase, and sector_erase instruction ports. The Altera^® IP checks this value before attempting to execute instructions in these instruction ports. If asserted or de-asserted by itself, no internal instructions are carried out.

write

No

Active-high input port that writes data.

If asserted high, the Altera^® IP writes from the datain[] port (single-byte write mode) or from the page-write buffer (page-write mode) to the address indicated by the addr[] port and to subsequent addresses for page-write mode.

When using page-write mode, you must use the shift_bytes port to shift in data bytes before asserting the write port.