PIC18F4550ESOSQTP datasheet(178/430 Pages) MICROCHIP

178 / 430 page

PIC18F2455/2550/4455/4550

DS39632D-page 176

Preliminary

TABLE 17-4:

ASSIGNMENT OF BUFFER DESCRIPTORS FOR THE DIFFERENT

BUFFERING MODES

TABLE 17-5:

SUMMARY OF USB BUFFER DESCRIPTOR TABLE REGISTERS

Endpoint

BDs Assigned to Endpoint

Mode 0

(No Ping-Pong)

Mode 1

(Ping-Pong on EP0 OUT)

Mode 2

(Ping-Pong on all EPs)

Mode 3

(Ping-Pong on all other EPs,

except EP0)

Out

0 (E), 1 (O)

2 (E), 3 (O)

4 (E), 5 (O)

6 (E), 7 (O)

2 (E), 3 (O)

4 (E), 5 (O)

8 (E), 9 (O)

10 (E), 11 (O)

6 (E), 7 (O)

8 (E), 9 (O)

12 (E), 13 (O)

14 (E), 15 (O)

10 (E), 11 (O)

12 (E), 13 (O)

16 (E), 17 (O)

18 (E), 19 (O)

14 (E), 15 (O)

16 (E), 17 (O)

20 (E), 21 (O)

22 (E), 23 (O)

18 (E), 19 (O)

20 (E), 21 (O)

24 (E), 25 (O)

26 (E), 27 (O)

22 (E), 23 (O)

24 (E), 25 (O)

28 (E), 29 (O)

30 (E), 31 (O) 26 (E), 27 (O)

28 (E), 29 (O)

32 (E), 33 (O)

34 (E), 35 (O)

30 (E), 31 (O) 32 (E), 33 (O)

36 (E), 37 (O)

38 (E), 39 (O)

34 (E), 35 (O)

36 (E), 37 (O)

40 (E), 41 (O)

42 (E), 43 (O)

38 (E), 39 (O)

40 (E), 41 (O)

44 (E), 45 (O)

46 (E), 47 (O)

42 (E), 43 (O)

44 (E), 45 (O)

48 (E), 49 (O)

50 (E), 51 (O)

46 (E), 47 (O)

48 (E), 49 (O)

52 (E), 53 (O)

54 (E), 55 (O)

50 (E), 51 (O)

52 (E), 53 (O)

56 (E), 57 (O)

58 (E), 59 (O)

54 (E), 55 (O)

56 (E), 57 (O)

60 (E), 61 (O)

62 (E), 63 (O)

58 (E), 59 (O)

60 (E), 61 (O)

Legend:

(E) = Even transaction buffer, (O) = Odd transaction buffer

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BDnSTAT(1)

UOWN

DTS(4)

PID3(2)

KEN(3)

PID2(2)

INCDIS(3)

PID1(2)

DTSEN(3)

PID0(2)

BSTALL(3)

BC9

BC8

BDnCNT(1)

Byte Count

BDnADRL(1)

Buffer Address Low

BDnADRH(1)

Buffer Address High

Note 1:

For buffer descriptor registers, n may have a value of 0 to 63. For the sake of brevity, all 64 registers are

shown as one generic prototype. All registers have indeterminate Reset values (xxxx xxxx).

Bits 5 through 2 of the BDnSTAT register are used by the SIE to return PID3:PID0 values once the register

is turned over to the SIE (UOWN bit is set). Once the registers have been under SIE control, the values

written for KEN, INCDIS, DTSEN and BSTALL are no longer valid.

Prior to turning the buffer descriptor over to the SIE (UOWN bit is cleared), bits 5 through 2 of the

BDnSTAT register are used to configure the KEN, INCDIS, DTSEN and BSTALL settings.

This bit is ignored unless DTSEN = 1.

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