ST7265X datasheet(66/166 Pages) STMICROELECTRONICS

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ST7265x

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USB INTERFACE (Cont’d)

USB Endpoint RAM Buffers

There are five bidirectional Endpoints including

one control Endpoint 0. Endpoint 1 and Endpoint 2

are counted as 4 bulk or interrupt Endpoints (two

IN and two OUT).

Endpoint 0 and Endpoint 1 are both 2 x 16 bytes in

size. Endpoint 2 is 2 x 64 bytes in size and can be

configured to physically target different USB Data

Buffer areas depending on the MOD[1:0] bits in

the CTLR register (see Figure 41, Figure 42 and

Figure 43).

The USB Data Buffer operates as a double buffer;

while one 512-byte block is being read/written by

the DTC, the USB interface reads/writes the other

512-byte block.

The management of the data transfer is performed

in upload and download mode (2 x 512 byte buff-

ers for Endpoint 2) by the USB Data Buffer Manag-

er.

Figure 41. Endpoint 2 Normal Mode selected by (MOD[1:0] Bits = 00h)

Figure 42. Endpoint 2 Download Mode selected by MOD[1:0] Bits = 10b

Endpoint 2 Buffer OUT

Endpoint 1 Buffer IN

Endpoint 1 Buffer OUT

Endpoint 0 Buffer IN

Endpoint 0 Buffer OUT

Endpoint 2 Buffer IN

16 Bytes

64 Bytes

1550h

155Fh

156Fh

157Fh

158Fh

15CFh

160Fh

USB DATA

512-byte buffer

as 64-byte slices

512-byte buffer

as 64-byte slices

64-byte buffer

1650h

1A4Fh

15CFh

Endpoint 2 Buffer IN

Endpoint 2 Buffer OUT

158Fh

1550h

Endpoint 1 Buffer OUT

Endpoint 1 Buffer IN

Endpoint 0 Buffer OUT

Endpoint 0 Buffer IN

1590h

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