Cypress Semiconductor FX2LP Información técnica Pagina 391

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Chapter 15. Registers Page 15-71
15.11.6 Endpoint 2, 4, 6, 8 Byte Count Low
Figure 15-76. Endpoint 2, 4, 6, 8 Byte Count Low
Bit 7-0 BC7:0 Byte Count
Low byte count for Endpoints 2, 4, 6, and 8.
15.11.7 Endpoint 0 Control and Status
Figure 15-77. Endpoint 0 Control and Status
Bit 7 HSNAK Hand Shake w/ NAK
The STATUS stage consists of an empty data packet with the opposite direction of the data
stage, or an IN if there was no data stage. This empty data packet gives the device a chance
to ACK, NAK, or STALL the entire CONTROL transfer. Write a 1 to the NAK (handshake
NAK) bit to clear it and instruct the USB core to ACK the STATUS stage. The HSNAK bit holds
EP2BCL
see Section 15.14
Endpoint 2 Byte Count LOW E691
EP4BCL
see Section 15.14
Endpoint 4 Byte Count LOW E695
EP6BCL
see Section 15.14
Endpoint 6 Byte Count LOW E699
EP8BCL
see Section 15.14
Endpoint 8 Byte Count LOW E69D
b7 b6 b5 b4 b3 b2 b1 b0
BC7 BC6 BC5 BC4 BC3 BC2 BC1 BC0
R/W R/W R/W R/W R/W R/W R/W R/W
x x x x x x x x
EP0CS Endpoint 0 Control and Status E6A0
b7 b6 b5 b4 b3 b2 b1 b0
HSNAK 0 0 0 0 0 BUSY STALL
R/W R/W R/W R/W R/W R/W R R/W
1 0 0 0 0 0 0 0
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