Cypress Semiconductor FX2LP Informações Técnicas Página 348

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EZ-USB FX2 Technical Reference Manual
Page 15-28 EZ-USB FX2 Technical Reference Manual v2.1
These registers configure the large, data-handling FX2 endpoints.
Bit 7 VALID Activate an Endpoint
Set VALID=1 to activate an endpoint, and VALID=0 to de-activate it. All FX2 endpoints default
to valid. An endpoint whose VALID bit is 0 does not respond to any USB traffic.
Bit 6 DIR Sets Endpoint Direction
0 = OUT, 1 = IN
Bit 5-4 TYPE Defines the Endpoint Type
These bits define the endpoint type, as shown in the table below. The TYPE bits apply to all of
the large-endpoint configuration registers.
Table 15-12. Endpoint Type Definitions
Bit 3 SIZE Sets Size of Endpoint Buffer
0 = 512 bytes, 1 = 1024 bytes
Endpoints 4 and 8 can only be 512 bytes. Endpoints 2 and 6 are selectable.
Bit 1-0 BUF Buffering Type/Amount
The amount of endpoint buffering is presented in Table 15-13.
Table 15-13. Endpoint Buffering Amounts
TYPE1 TYPE0 Endpoint Type
0 0 Invalid
0 1 ISOCHRONOUS
1 0 BULK (default)
1 1 INTERRUPT
BUF1 BUF0 Buffering
0 0 Quad
0 1 Invalid
1 0 Double
1 1 Triple
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