Implementation using the altdq_dqs2 ip core – Altera PHYLite User Manual
Page 53
Synchronous Signals
Description
CMD/ADDR signals (output
from FPGA, input to memory)
Signal
Type
Description
ALE
Input Address latch enable. Loads an address
from DQx into the address register.
CE#
Input Chip enable. Enables or disables one or
more die (LUNs) in a target.
CLE
Input Command latch enable. Loads a command
from DQx into the command register.
W/R#
Input Read enable and write/read enable. RE#
transfers serial data from the NAND Flash
to the host system when the asynchronous
interface is active. When the synchronous
interface is active, WR# controls the
direction of DQx and DQS.
CLK
Input Write enable and clock. WE# transfers
commands, addresses, and serial data from
the host system to the NAND Flash when
the asynchronous interface is active. When
the synchronous interface is active, CLK
latches command and address cycles.
WP#
Input Write protect. Enables and disables array
PROGRAM and ERASE operations.
R/B# (output from memory,
input to the FPGA.)
Ready/Busy. This signal is an open-drain, active-low output that requires
an external pull-up resistor. This signal indicates target array activity.
Implementation Using the ALTDQ_DQS2 IP Core
The following lists the possible implementations when you target Arria V, Cyclone V, and Stratix V
devices:
• Instantiates two ALTDQ_DQS2 IP cores.
• Bidirectional type for DQ and DQS (
)
)
• Instantiates a ALTIOBUF (input) for the
ready
signal
• Connects the ALTERA_PLL, ALTDLL, and ALTOCT IP cores to complete the PHY-only design.
ug_altera_phylite
2015.01.16
Implementation Using the ALTDQ_DQS2 IP Core
53
Altera PHYLite for Parallel Interfaces IP Core User Guide
Altera Corporation