TUSB3210 datasheet(19/44 Pages) TI

19 / 44 page

2–7

Table 2–3. EDB and Buffer Allocations in XDATA (Continued)

ADDRESS

DESCRIPTION

FEF7

↑

(8–bytes)

Output endpoint_0 buffer

FEF0

(8 bytes)

Out ut end oint_0 buffer

FEEF

TOPBUFF

Top of buffer space

↑



Buffers space



FD80

STABUFF

Start of buffer space

2.4

Endpoint Descriptor Block (EDB-1 to EDB-3)

Data transfers between USB, MCU and external devices are defined by an endpoint descriptor block (EDB). Four

input and four output EDBs are provided. With the exception of EDB–0 (I/O Endpoint–0), all EDBs are located in

SRAM as shown in Table 2–3. Each EDB contains information describing the X and Y buffers. In addition, it provides

general status information.

Table 2–4 illustrates the EDB entries for EDB–1 to EDB–3. EDB–0 registers will be described separately.

Table 2–4. EDB Entries in RAM (n = 1 to 3)

Offset

ENTRY NAME

DESCRIPTION

EPSIZXY_n

I/O endpoint_n: X/Y buffer size

EPBCTY_n

I/O endpoint_n: Y byte count

EPBBAY_n

I/O endpoint_n: Y buffer base address

SPARE

Not used

SPARE

Not used

EPBCTX_n

I/O endpoint_n: X byte count

EPBBAX_n

I/O endpoint_n: X buffer base address

EPCNF_n

I/O endpoint_n: configuration

2.4.1

OEPCNF_n: Output Endpoint Configuration (n=1 to 3)

210

UBME

ISO

TOGLE

DBUF

STALL

USBIE

RSV

R/W

R/O

BIT

NAME

RESET

FUNCTION

1–0

RSV

Reserved

USBIE

USB interrupt enable on transaction completion. Set/clear by MCU.

USBIE = 0 no interrupt

USBIE = 1 interrupt on transaction completion

STALL

USB stall condition indication. Set/clear by MCU.

STALL = 0

No stall

STALL = 1

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

DBUF

Double buffer enable. Set/clear by MCU.

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

ISO

ISO = 0

Non-isochronous transfer. This bit must be cleared by MCU since only Non-isochronous transfer

is supported.

UBME

UBM enable/disable bit. Set/clear by MCU.

UBME = 0 UBM cannot use this endpoint.

UBME = 1 UBM can use this endpoint.

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