EP1M350 datasheet(23/34 Pages) ALTERA

23 / 34 page

Chapter 1: Enhanced Configuration Devices (EPC4, EPC8, and EPC16) Data Sheet

1–23

Pin Description

Altera Corporation

Configuration Handbook (Complete Two-Volume Set)

RP#

(1)

Input

Active low flash input pin that resets the flash when asserted. When high, it

enables normal operation. When low, it inhibits write operation to the flash

memory, which provides data protection during power transitions.

This flash input is not internally connected to the controller. Hence, an external

loop-back connection between C-RP# and F-RP# must be made on the board

even when you are not using the external flash interface.

When using the external flash interface, connect the external device to the RP#

pin with the loop back. Always tri-state RP# when the flash is not in use.

OE#

Input

Active-low flash-control input that is asserted by the controller or external device

during flash read cycles. When asserted, it enables the drivers of the flash output

pins.

Leave this pin floating on the board when the external flash interface is not used.

WE#

(1)

Input

Active-low flash-write strobe asserted by the controller or external device during

flash write cycles. When asserted, it controls writes to the flash memory. In the

flash memory, addresses and data are latched on the rising edge of the WE#

pulse.

This flash input is not internally connected to the controller. Hence, an external

loop-back connection between C-WE# and F-WE# must be made on the board

even when you are not using the external flash interface.

When using the external flash interface, connect the external device to the WE#

pin with the loop back.

WP#

Input

Usually tied to VCC or ground on the board. The controller does not drive this pin

because it could cause contention.

Connection to VCC is recommended for faster block erase/programming times and

to allow programming of the flash-bottom boot block, which is required when

programming the device using the Quartus II software.

This pin should be connected to VCC even when the external flash interface is not

used.

VCCW

Supply

Block erase, full-chip erase, word write, or lock-bit configuration power supply.

Connect this pin to the 3.3-V VCC supply, even when you are not using the external

flash interface.

RY/BY#

Open-Drain Output

Flash asserts this pin when a write or erase operation is complete. This pin is not

connected to the controller. RY/BY# is only available in Sharp flash-based EPC8

and EPC16. (2)

Leave this pin floating when the external flash interface is not used.

Table 1–9. External Flash Interface Pins (Part 2 of 3)

Pin Name

Pin Type

Description

EP1M350 Datasheet(PDF) 23 Page - Altera Corporation

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