Cypress Semiconductor FX2LP Información técnica Pagina 335

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Chapter 15. Registers Page 15-15
Bit 7 IFCLKSRC FIFO/GPIF Clock Source
This bit selects the clock source for both the FIFOS and GPIF. If IFCLKSRC=0, the external
clock on the IFCLK pin is selected. If IFCLKSRC=1 (default), an internal 30- or 48-MHz
(default) clock is used.
Bit 6 3048MHZ Internal FIFO/GPIF Clock Frequency
This bit selects the internal FIFO & GPIF clock frequency.
Bit 5 IFCLKOE IFCLK pin output enable
0=Tri-state
1=Drive
Bit 4 IFCLKPOL Invert the IFCLK signal
This bit indicates that the IFCLK signal is inverted.
When IFCLKPOL=0, the clock has the polarity shown in all the timing diagrams in this manual.
When IFCLKPOL=1, the clock is inverted.
Figure 15-9. IFCLK Configuration
Table 15-5. Internal FIFO/GPIF Clock Frequency
3048MHZ FIFO & GPIF Clock
0 30 MHz
1 48 MHz(default)
0
1
30 MHz
48 MHz
0
1
0
1
1
0
Internal
IFCLK
Signal
IFCFG.7
IFCFG.4
IFCFG.6
IFCFG.4 IFCFG.5
IFCLK
Pin
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