Configuration Handbook - Kamami.pl

Pin DescriptionTable 2–7. External Flash Interface Pins (Part 2 of 3)Pin Name Pin Type DescriptionOE# Input Active-low flash-control input that is asserted by the controller or externaldevice during flash read cycles. When asserted, it enables the drivers ofthe flash output pins.Leave this pin floating on the board when the external flash interface is notused.WE# (1) Input Active-low flash-write strobe asserted by the controller or external deviceduring flash write cycles. When asserted, it controls writes to the flashmemory. In the flash memory, addresses and data are latched on the risingedge of the WE# pulse.This flash input is not internally connected to the controller. Hence, anexternal loop-back connection between C-WE# and F-WE# must be madeon the board even when you are not using the external flash interface.When using the external flash interface, connect the external device to theWE# pin with the loop back.WP# Input This pin is usually tied to V CC or ground on the board. The controller doesnot drive this pin because it could cause contention.Connection to V CC is recommended for faster block erase/programmingtimes and to allow programming of the flash-bottom boot block, which isrequired when programming the device using the Quartus II software.This pin should be connected to V CC even when the external flash interfaceis not used.VCCW Supply Block erase, full-chip erase, word write, or lock-bit configuration powersupply.Connect this pin to the 3.3-V V CC supply, even when you are not using theexternal flash interface.RY/BY# Output Flash asserts this pin when a write or erase operation is complete. This pinis not connected to the controller. RY/BY# is only available in Sharpflash-based EPC8 and EPC16.(2)Leave this pin floating when the external flash interface is not used.2–24 Altera CorporationConfiguration Handbook, Volume 2 May 2007