
Chapter 15. Registers Page 15-75
Bit 5-4 NPAK1:0 Number of Packets in FIFO
The number of packets in the FIFO. 0-2 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.
15.11.11 Endpoint 6 Control and Status
Figure 15-81. Endpoint 6 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.
EP6CS Endpoint 6 Control and Status E6A5
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 0 0 0 1 0 0
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