Cypress Semiconductor FX2LP Informacje Techniczne Pobierz pdf (Strona 389)

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Chapter 15. Registers Page 15-69

The SIE normally determines how many bytes to send over EP0 in response to a device

request by taking the smaller of (a) the wLength field in the SETUP packet, and (b) the number

of bytes available for transfer (byte count).

15.11.2 Endpoint 0 Control and Status (Byte Count Low)

Figure 15-72. Endpoint 0 Control and Status (Byte Count Low)

Bit 7-0 BC7:0 Low Order Byte Count

Even though the EP0 buffer is only 64 bytes, the EP0 byte count is expanded to 16 bits to

allow using the SUDPTR with a custom length, instead of USB-dictated length (from Setup

Data Packet and number of requested bytes). The byte count bits in parentheses apply only

when SDPAUTO (SUDPTRCTL.0) = 0.

15.11.3 Endpoint 1 OUT and IN Byte Count

Figure 15-73. Endpoint 1 OUT/IN Byte Count

Bit 7-0 BC6:0 Endpoint 1 IN/OUT Byte Count

EP0BCL Endpoint 0 Byte Count Low E68B

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

EP1OUTBC Endpoint 1 OUT Byte Count E68D

EP1INBC Endpoint 1 IN Byte Count E68F

b7 b6 b5 b4 b3 b2 b1 b0

0 BC6 BC5 BC4 BC3 BC2 BC1 BC0

R/W R/W R/W R/W R/W R/W R/W R/W

0 x x x x x x x

1 2 ... 384 385 386 387 388 389 390 391 392 393 394 ... 459 460

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