
EZ-USB FX2 Technical Reference Manual
Page 15-18 EZ-USB FX2 Technical Reference Manual v2.1
15.5.3 Slave FIFO FLAGA-FLAGD Pin Configuration
Figure 15-10. Slave FIFO FLAGA-FLAGD Pin Configuration
FX2 has four FIFO flag output pins, FLAGA, FLAGB, FLAGC and FLAGD. These flags can be pro-
grammed to represent various FIFO flags using four select bits for each FIFO. The PINFLAGSAB
register controls the FLAGA and FLAGB signals, and the PINFLAGSCD register controls the
FLAGC and FLAGD signal. The 4-bit coding for all four flags is the same, as shown in Table 15-9.
In the “FLAGx” notation, “x” can be A, B, C or D.
PINFLAGSAB
see Section 15.14
Slave FIFO FLAGA and FLAGB Pin
Configuration
E602
b7 b6 b5 b4 b3 b2 b1 b0
FLAGB3 FLAGB2 FLAGB1 FLAGB0 FLAGA3 FLAGA2 FLAGA1 FLAGA0
R/W R/W R/W R/W R/W R/W R/W R/W
0 0 0 0 0 0 0 0
PINFLAGSCD
see Section 15.14
Slave FIFO FLAGC and FLAGD Pin
Configuration
E603
b7 b6 b5 b4 b3 b2 b1 b0
FLAGD3 FLAGD2 FLAGD1 FLAGD0 FLAGC3 FLAGC2 FLAGC1 FLAGC0
R/W R/W R/W R/W R/W R/W R/W R/W
0 1 0 0 0 0 0 0
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