ep2c35 Altera Corporation, ep2c35 Datasheet - Page 53

• Manufacturer Part Number: ep2c35
• Description: Cyclone Ii Device Family Data Sheet
• Manufacturer: Altera Corporation

Figure 2–23. Signal Path Through the I/O Block
Altera Corporation
February 2007
From Logic
To Logic
Array
Array
Row or Column
io_cce_out
io_clk[5..0]
io_dataout
io_datain0
io_datain1
io_cce_in
io_caclr
io_csclr
io_cclk
io_coe
The pin’s datain signals can drive the logic array. The logic array drives
the control and data signals, providing a flexible routing resource. The
row or column IOE clocks, io_clk[5..0], provide a dedicated routing
resource for low-skew, high-speed clocks. The global clock network
generates the IOE clocks that feed the row or column I/O regions (see
“Global Clock Network & Phase-Locked Loops” on page
Figure 2–23
Each IOE contains its own control signal selection for the following
control signals: oe, ce_in, ce_out, aclr/preset, sclr/preset,
clk_in, and clk_out.
selection.
Data and
Selection
Control
Signal
illustrates the signal paths through the I/O block.
oe
ce_in
ce_out
aclr/preset
sclr/preset
clk_in
clk_out
dataout
Figure 2–24
To Other
IOEs
Cyclone II Device Handbook, Volume 1
illustrates the control signal
IOE
Cyclone II Architecture
2–16).
2–41