TUSB3410 datasheet(30/92 Pages) TI

30 / 92 page

4–10

4.3.12 IEPSIZXY_n: Output Endpoint X-/Y-Buffer Size (n = 1 to 3)

765

RSV

R/W

BIT

NAME

RESET

FUNCTION

6–0

C[6:0]

X- and Y-buffer size:

0000.0000b Size = 0

0000.0001b Size = 1 byte

0011.1111b Size = 63 bytes

0100.0000b Size = 64 bytes

Any value

≥ 100.0001b may result in unpredictable results.

RSV

Reserved = 0

4.4

Endpoint-0 Descriptor Registers

Unlike registers EDB–1 to EDB–3, which are defined as memory entries in SRAM, endpoint–0 is described by a set

of four registers (two for output and two for input). The registers and their respective addresses, used for EDB–0

description, are defined in Table 4–6. EDB–0 has no base-address register, since these addresses are hardwired into

FEF8 and FEF0. Note that the bit positions have been preserved to provide consistency with EDB–n (n = 1 to 3).

Table 4–6. Input/Output EDB-0 Registers

ADDRESS

DESCRIPTION

BASE ADDRESS

FF83

FF82

OEPBCNT_0

OEPCNFG_0

Output endpoint_0: Byte count register

Output endpoint_0: Configuration register

FEF0

FF81

FF80

IEPBCNT_0

IEPCNFG_0

Output endpoint_0: Byte count register

Output endpoint_0: Configuration register

FEF8

4.4.1

IEPCNFG_0: Input Endpoint-0 Configuration Register (Addr:FF80)

765

UBME

RSV

TOGLE

RSV

STALL

USBIE

RSV

R/W

R/O

R/W

R/O

BIT

NAME

RESET

FUNCTION

1–0

RSV

Reserved = 0

USBIE

USB interrupt enable on transaction completion. Set/cleared by the MCU.

USBIE = 0 No interrupt

USBIE = 1 Interrupt on transaction completion

STALL

USB stall condition indication. Set/cleared by the MCU

STALL = 0 No stall

STALL = 1 USB stall condition. If set by the MCU a STALL handshake is initiated and the bit is cleared

automatically by the next setup transaction.

RSV

Double buffer enable

DBUF = 0 Primary buffer only (X-buffer only)

DBUF = 1 Toggle bit selects buffer

TOGLE

USB toggle bit. This bit reflects the toggle sequence bit of DATA0, DATA1.

RSV

Reserved = 0

UBME

UBM enable/disable bit. Set/cleared by the MCU

UBME = 0 UBM cannot use this endpoint

UBME = 1 UBM can use this endpoint

4.4.2

IEPBCNT_0: Input Endpoint-0 Byte Count Register (Addr:FF81)

765

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