AT89C5132-ROTIL datasheet(70/182 Pages) ATMEL

70 / 182 page

4173E–USB–09/07

AT89C5132

15.1.3

Function Interface Unit (UFI)

The Function Interface Unit provides the interface between the AT89C5132 and the SIE. It man-

ages transactions at the packet level with minimal intervention from the device firmware, which

reads and writes the endpoint FIFOs.

Figure 15-6 shows typical USB IN and OUT transactions reporting the split in the hardware (UFI)

and software (C51) load.

Figure 15-5. UFI Block Diagram

Figure 15-6. USB Typical Transaction Load

15.2

USB Interrupt System

As shown in Figure 15-7, the USB controller of the AT89C5132 handle sixteen interrupt sources.

These sources are separated in two groups: the endpoints interrupts and the controller inter-

rupts, combined together to appear as single interrupt source for the C51 core. The USB

interrupt is enabled by setting the EUSB bit in IEN1.

To/From C51 Core

Endpoint Control

C51 side

Endpoint Control

USB side

Endpoint 2

Endpoint 1

Endpoint 0

USBCON

USBINT

USBIEN

UEPINT

UEPIEN

UEPNUM

UEPSTAX

USBADDR

UEPCONX

UEPDATX

UEPRST

UBYCTX

UFNUMH

UFNUML

Asynchronous Information

Transfer

Control

FSM

To/From SIE

12 MHz DPLL

OUT Transactions:

HOST

UFI

C51

OUT

DATA0 (n Bytes)

ACK

Endpoint FIFO read (n Bytes)

OUT

DATA1

NACK

OUT

DATA1

ACK

IN Transactions:

HOST

UFI

C51

ACK

Endpoint FIFO Write

DATA1

NACK

C51 interrupt

DATA1

C51 interrupt

Endpoint FIFO write

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