Cypress Semiconductor FX2LP Información técnica Pagina 162

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EZ-USB FX2 Technical Reference Manual
Page 9-6 EZ-USB FX2 Technical Reference Manual v2.1
Figure 9-6. IFCLK Configuration
Figure 9-7. Satisfying Setup Timing by Inverting the IFCLK Output
9.2.4 FIFO Flag Pins (FLAGA, FLAGB, FLAGC, FLAGD)
Four pins — FLAGA, FLAGB, FLAGC, and FLAGD — report the status of the FX2’s FIFOs; in
addition to the usual “FIFO full” and “FIFO empty” signals, there is also a signal which indicates
that a FIFO has filled to a user-programmable level. The external master typically monitors the
“empty” flag of OUT endpoints and the “full” flag of IN endpoints; the “programmable-level” flag is
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
FX2
Asserts
Flag
t
s
Master
Samples
Flag
Internal IFCLK Signal
Inverted IFCLK Output
FIFO Flag
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