Cypress Semiconductor FX2LP Información técnica Pagina 394

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EZ-USB FX2 Technical Reference Manual
Page 15-74 EZ-USB FX2 Technical Reference Manual v2.1
15.11.9 Endpoint 2 Control and Status
Figure 15-79. Endpoint 2 Control and Status
Bit 6-4 NPAK2:0 Number of Packets in FIFO
The number of packets in the FIFO. 0-4 Packets.
Bit 3 FULL Endpoint FIFO Full
This bit is set to 1 to indicate that the Endpoint FIFO is full.
Bit 2 EMPTY Endpoint FIFO Empty
This bit is set to 1 to indicate that the Endpoint FIFO is empty.
Bit 0 STALL ENDPOINT STALL
Set this bit to 1 to
stall
an endpoint, and to 0 to clear a stall.
When the stall bit is 1, the USB core returns a STALL handshake for all requests to the end-
point. This notifies the host that something unexpected has happened.
15.11.10 Endpoint 4 Control and Status
Figure 15-80. Endpoint 4 Control and Status
EP2CS Endpoint 2 Control and Status E6A3
b7 b6 b5 b4 b3 b2 b1 b0
0 NPAK2 NPAK1 NPAK0 FULL EMPTY 0 STALL
R R R R R R R R/W
0 0 1 0 1 0 0 0
EP4CS Endpoint 4 Control and Status E6A4
b7 b6 b5 b4 b3 b2 b1 b0
0 0 NPAK1 NPAK0 FULL EMPTY 0 STALL
R R R R R R R R/W
0 0 1 0 1 0 0 0
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