Chapter 1: Enhanced Configuration Devices (EPC4, EPC8, and EPC16) Data Sheet
1–23
Pin Description
Table 1–9. External Flash Interface Pins (Part 2 of 3)
Pin Name
RP#(1)
Pin Type
Description
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
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)
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.
© December 2009 Altera Corporation
Configuration Handbook (Complete Two-Volume Set)
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