ProASICPLUS Flash Family FPGAs
2- 12
v5.9
Note: When a signal from an I/O tile is connected to the core, it cannot be connected to the global MUX at the same time.
Figure 2-12 Input Connectors to ProASICPLUS Clock Conditioning Circuitry
Table 2-7
Clock-Conditioning Circuitry MUX Settings
MUX
Datapath
Comments
FBSEL
1
Internal Feedback
2
Internal Feedback and Advance Clock Using FBDLY
–0.25 to –4 ns in 0.25 ns increments
3
External Feedback (EXTFB)
XDLYSEL
0
Feedback Unchanged
1
Deskew feedback by advancing clock by system delay
Fixed delay of –2.95 ns
OBMUX
GLB
0
Primary bypass, no divider
1
Primary bypass, use divider
2
Delay Clock Using FBDLY
+0.25 to +4 ns in 0.25 ns increments
4
Phase Shift Clock by 0°
5
Reserved
6
Phase Shift Clock by +180°
7
Reserved
OAMUX
GLA
0
Secondary bypass, no divider
1
Secondary bypass, use divider
2
Delay Clock Using FBDLY
+0.25 to +4 ns in 0.25 ns increments
3
Phase Shift Clock by 0°
Configuration Tile
PECL Pad Cell
GLMX
GL
Std. Pad Cell
GL
NPECL
PPECL
CORE
Package Pins
Physical I/O
Buffers
Global MUX
External
Feedback
Global MUX B
OUT
Global MUX A
OUT
Legend
Physical Pin
DATA Signals to the Core
DATA Signals to the PLL Block
DATA Signals to the Global MUX
Control Signals to the Global MUX