MAX3421E datasheet(2/32 Pages) MAXIM

Part #	MAX3421E

Description	USB Peripheral/Host Controller with SPI Interface

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Manufacturer	MAXIM [Maxim Integrated Products]

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Features in Host Operation

♦ Eleven Registers (R21–R31) are Added to the

MAX3420E Register Set to Control Host Operation

♦ Host Controller Operates at Full Speed or Low

Speed

♦ FIFOS

SNDFIFO: Send FIFO, Double-Buffered 64-Byte

RCVFIFO: Receive FIFO, Double-Buffered 64-Byte

♦ Handles DATA0/DATA1 Toggle Generation and

Checking

♦ Performs Error Checking for All Transfers

♦ Automatically Generates SOF (Full-Speed)/EOP

(Low-Speed) at 1ms Intervals

♦ Automatically Synchronizes Host Transfers with

Beginning of Frame (SOF/EOP)

♦ Reports Results of Host Requests

♦ Supports USB Hubs

♦ Supports ISOCHRONOUS Transfers

♦ Simple Programming

SIE Automatically Generates Periodic SOF

(Full-Speed) or EOP (Low-Speed) Frame

Markers

SPI Master Loads Data, Sets Function Address,

Endpoint, and Transfer Type, and Initiates the

Transfer

MAX3421E Responds with an Interrupt and

Result Code Indicating Peripheral Response

Transfer Request Can be Loaded Any Time

SIE Synchronizes with Frame Markers

For Multipacket Transfers, the SIE

Automatically Maintains and Checks the

Data Toggles

Features in Peripheral Operation

♦ Built-In Endpoint FIFOS

EP0: CONTROL (64 bytes)

EP1: OUT, BULK or INTERRUPT, 2 x 64 Bytes

(Double-Buffered)

EP2: IN, BULK or INTERRUPT, 2 x 64 Bytes

(Double-Buffered)

EP3: IN, BULK or INTERRUPT (64 Bytes)

♦ Double-Buffered Data Endpoints Increase

Throughput by Allowing the SPI Master to

Transfer Data Concurrent with USB Transfers

♦ SETUP Data Has its Own 8-Byte FIFO, Simplifying

Firmware

USB Peripheral/Host Controller

with SPI Interface

2

_______________________________________________________________________________________

The MAX3421E connects to any microprocessor (µP)

using 3 or 4 interface pins (Figure 1). On a simple

microprocessor without SPI hardware, these can be

bit-banged general-purpose I/O pins. Eight GPIN and

eight GPOUT pins on the MAX3421E more than

replace the µP pins necessary to implement the inter-

face. Although the MAX3421E SPI hardware includes

separate data-in (MOSI, master-out, slave-in) and data-

out (MISO, master-in, slave-out) pins, the SPI interface

can also be configured for the MOSI pin to carry bidi-

rectional data, saving an interface pin. This is referred

to as half-duplex mode.

Typical Application Circuits

3.3V

REGULATOR

SPI

3, 4

INT

USB

μP

MAX3421E

Figure 1. The MAX3421E Connects to Any Microprocessor

Using 3 or 4 Interface Pins

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