AN169

28

Rev. 2.3

Internal Oscillator1

Enabled (OSCICN.7 = 1)

4x Clock Multiplier1

Enabled (Source: Internal Oscillator)

USB Clock Recovery1

Enabled (CLKREC = 0x8F)

USB Clock Source1

Clock multiplier (48 MHz)

USB Speed

Full Speed (12 Mbps)

USB Transfer Type

Bulk Transfer

Max data payload size

(Control Endpoint, EP0)

64 bytes per data packet

Number of bulk data

endpoints used

2 (EP2 in Split Mode)

2 (EP2 in Split Mode)

2 (EP1 and EP2)

Max data payload size

(Bulk data endpoints)

64 bytes per data packet

Double buffering

Enabled for both IN and

OUT endpoints (FIFO can

hold two packets each at

any time).

Enabled for both IN and

OUT endpoints (FIFO can

hold two packets each at any

time).

Enabled for OUT endpoint

(FIFO can hold two packets

at any time). Disabled for IN

endpoint.

XDATA space reserved

by the library2

448 bytes XDATA (0x0640

to 0x07FF) [includes USB

FIFO space]

448 bytes XDATA (0x0640 to

0x07FF) [includes USB FIFO

space]

116 bytes (0x038C to

0x03FF) XDATA + 256 bytes

(0x0400 to 0x04FF) USB

FIFO

Starting address to

relocate USB_Init

function parameters

(see " Saving XDATA

Space" on page 26)

0x07AF

0x07AF

0x3EF

USBXpress Firmware

Library Name

USBX_F38X.LIB

USBX_T620_1_320_3.LIB

USBX_T622_3_T326_7.LIB

Table 1. Firmware Library Technical Details (Continued)

Notes:

1. The clock settings listed in this table are valid only if the default USBXpress clock functions (USB_Clock_Start and

USBXcore_ClkRec) are not overridden by user firmware.

2. This reserved space includes the relocated USB_Init parameters using linker commands. See " Saving XDATA Space"

on page 26 for more details. This only applies to the Keil libraries.