EP1C20F ALTERA [Altera Corporation], EP1C20F Datasheet - Page 35

• Manufacturer Part Number: EP1C20F
• Description: Cyclone FPGA Family
• Manufacturer: ALTERA [Altera Corporation]

Figure 2–21. Single-Port Mode
Note to
(1)
Global Clock
Network and
Phase-Locked
Loops
Altera Corporation
May 2008
address[ ]
outclken
outclock
inclken
inclock
data[ ]
wren
Violating the setup or hold time on the address registers could corrupt the memory contents. This applies to both
read and write operations.
Figure
6 LAB Row
Clocks
6
2–21:
Single-Port Mode
The M4K memory blocks also support single-port mode, used when
simultaneous reads and writes are not required. See
M4K memory block can support up to two single-port mode RAM blocks
if each RAM block is less than or equal to 2K bits in size.
Cyclone devices provide a global clock network and up to two PLLs for a
complete clock management solution.
Global Clock Network
There are four dedicated clock pins (CLK[3..0], two pins on the left side
and two pins on the right side) that drive the global clock network, as
shown in
(DPCLK[7..0]) pins can also drive the global clock network.
Note (1)
D
ENA
D
ENA
Figure
Q
Q
2–22. PLL outputs, logic array, and dual-purpose clock
Generator
D
ENA
Pulse
Write
Q
Global Clock Network and Phase-Locked Loops
Data In
Address
Write Enable
RAM/ROM
1,024 × 4
2,048 × 2
4,096 × 1
Data Out
256 × 16
512 × 8
D
ENA
Figure
Q
2–21. A single
Preliminary
To MultiTrack
Interconnect
2–29