Cypress Semiconductor FX2LP Información técnica Pagina 354

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EZ-USB FX2 Technical Reference Manual
Page 15-34 EZ-USB FX2 Technical Reference Manual v2.1
Figure 15-29. Endpoint 6/Slave FIFO Programmable Flag High
These registers control the point at which the programmable flag (PF) is asserted for each of the
four endpoint FIFOs. The EPxFIFOPFH:L fields are interpreted differently for OUT and IN end-
points.
The threshold point for the programmable-level flag (PF) is configured as follows:
Each FIFOs programmable-level flag (PF) asserts when the FIFO reaches a user-defined fullness
threshold. That threshold is configured as follows:
1. For OUT packets: The threshold is stored in PFC12:0. The PF is asserted when the number of
bytes
in the entire FIFO
is less than/equal to (DECIS=0) or greater than/equal to (DECIS=1)
the threshold.
2. For IN packets, with PKTSTAT = 1: The threshold is stored in PFC9:0. The PF is asserted
when the number of bytes written into the current, not-yet-committed packet in the FIFO is
less than/equal to (DECIS=0) or greater than/equal to (DECIS=1) the threshold.
3. For IN packets, with PKTSTAT = 0: The threshold is stored in two parts: PKTS2:0 holds the
number of committed packets, and PFC9:0 holds the number of bytes in the current, not-yet-
committed packet. The PF is asserted when the FIFO is at or less full than (DECIS=0), or at or
more full than (DECIS=1), the threshold.
EP6FIFOPFH
see Section 15.14
Endpoint 6/Slave FIFO Programmable-Level
Flag HIGH
[HIGH SPEED (480 Mbit/Sec) Mode and
FULL-SPEED (12 Mbit/Sec) Iso Mode]
E634
b7 b6 b5 b4 b3 b2 b1 b0
DECIS PKTSTAT IN: PKTS[2]
OUT:PFC12
IN: PKTS[1]
OUT:PFC11
IN: PKTS[0]
OUT:PFC10
0 PFC9 PFC8
R/W R/W R/W R/W R/W R/W R/W R/W
0 0 0 0 1 0 0 0
EP6FIFOPFH
see Section 15.14
Endpoint 6/Slave FIFO Programmable-Level
Flag HIGH
[FULL SPEED (12 Mbit/Sec) Non-Iso Mode]
E634
b7 b6 b5 b4 b3 b2 b1 b0
DECIS PKTSTAT OUT:PFC12 OUT:PFC11 OUT:PFC10 0 PFC9 IN: PKTS[2]
OUT:PFC8
R/W R/W R/W R/W R/W R/W R/W R/W
0 0 0 0 1 0 0 0
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