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Oki JOB60851 4-3-3. Connecting Microcontroller to USB Controller

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Chapter 4 Software Development

page 4-18

Figure 4.3.1. ML60851C Block Diagram

Protocol engine operation for a control transfer setup transaction differs from that for all other

transactions.

Setup transactions always write the eight bytes in the associated data packet to the setup registers. If

this data is received successfully, the protocol engine sends an ACK back to the host. It also sends a

setup interrupt to the control microcontroller to request register readout.

Data receive transactions write the data from the USB bus to the specified endpoint's receive buffer

if there is room. If this data is received successfully, the protocol engine sends an ACK back to the

host. It also sends a data received interrupt for the command to the control microcontroller. If there

is no room in the receive buffer or there is an error, the protocol engine sends an NAK back to the

host.

Data transmit transactions send a data packet from the specified endpoint's transmit buffer to the

USB bus if there one ready. If the host then sends an ACK completing the transaction, the Data

transmit transactions send a data packet from the specified endpoint's transmit buffer to the USB bus

if there one ready. If the host then sends an ACK completing the transaction, the protocol engine

empties the buffer. It also sends a transmit buffer empty interrupt to the control microcontroller to

request more data.

4-3-3. Connecting Microcontroller to USB Controller

The ML60851C offers the following configuration options for the microcontroller interface.

(1) Choice, with ADSEL pin, of separate or multiplexed address and data buses

(2) Choice, with register setting under program control, of 8- or 16-bit DMA

The 16-bit data bus is only available when 16-bit DMA is used.

The JOB60851 board uses separate address and data buses, an 8-bit data bus, and no DMA.

Transceiver

/receiver

D+

Protocol

engine

DPLL

D-

EP0 receive

buffer ( 8 bytes)

Status and

control registers

Setup

registers

(8 bytes)

EP0 trasmit

buffer (8bytes)

EP1 receive/

trasmit double

buffer

(64 bytes x 2)

EP2 receive/

transmit buffer

(64 bytes)

Microcontroller -DMA

interface

A7-A0

D15-D8

RD/

WR/

CS/

INTR/

FIFO

USB

EP3 transmit

buffer (8 bytes)

AD7-AD0

ALE

Oscillator DACK

DREQ

ADSEL

Contents

Main Page OKI Contents 1. Introduction ............................................................................ 1-1 2. Putting Board through its Paces........................................... 2-1 3. System Specifications............................................................ 3-1 4. Software Development........................................................... 4-1 Page Page 1-1. Checking Packing List Page 1-3. Precaution for Safe and Proper Use Labels Warning Caution Icons Warning Caution Notation Page 2-1. Setup 2-1-1. Configuring JOB60851 Board 2-1-2. Installing Development Software 2-1-3. Connecting Board 2-2. Running Default Program 2-2-1. Installing USB Driver 2-2-2. Running Flash Memory Program Page 2-3. Running User Programs 2-3-1. Connecting Serial Cable 2-3-2. Loading Terminal Emulator 2-3-3. Synchronizing Link 2-3-4. Downloading and Executing 2-4. Overwriting Flash Memory Contents Page 3-1. System Components 3-1-1. System Objective 3-1-2. System Components 3-2. Hardware Specification 3-2-1. Connectors and Switches Page Page Page page 3-7 3-2-3. Parts List Tables 3.2.1 and 3.2.2 list the parts on the JOB60851 board. Table 3.2.1. Parts List (1/2) page 3-8 3-2-4. Memory Maps Figure 3.2.4. Memory Map for Download Mode Data Memory Program Memory Loader Mode 1 memory map ( Load_Sel/ = L ) ( EA/ = L ) Figure 3.2.5. Memory Map for Flash Execution Mode Data Memory Program Memory Loader Mode2 memory map ( Load_Sel/ = L ) ( EA/ = H ) Ext._SRAM Figure 3.2.6. Memory Map for Application Mode Data Memory AP Mode 1 memory map ( Load_Sel/ = H ) ( EA/ = L ) Ext._SRAM Ext._EPROM Figure 3.2.7. Memory Map for Flash Rewrite Mode Data Memory Program Memory AP Mode2 memory map ( Load_Sel/ = H ) ( EA/ = H ) Ext._SRAM 3-3. System Limitations 3-3-1. Resources Uses Table 3.3.1. MSM66Q573 Pin Assignments (2/2) Page 4-1. USB Basics 4-1-1. Bus Topology, Addresses, and Hot Plugging 4-1-2. Specification Documents 4-1-3. Core Specifications 4-1-4. Data Flow Types 4-1-5. Bus Transactions 4-1-6. Packets 4-1-7. Endpoints 4-1-8. Data Rates 4-1-9. Device Class Specifications 4-1-10. Device Requests 4-1-11. Standard Device Requests 4-1-12. Device Descriptors (2) Configuration descriptor (3) Interface descriptor (4) Endpoint descriptor Total size of this descriptor in bytes (5) String descriptor 4-2. Sample USB Firmware 4-2-1. Setup 4-2-2. Sample Firmware Specifications 4-2-3. Sample USB Host Software 4-2-4. Compiling and Executing Sample USB Firmware 4-2-5. Confirming USB Compliance with Usbcheck.exe Page 4-2-6. Creating USB Mouse Demo HID_MOUSE_ONLY one. 4-2-7. Modifying Application Layer Receive Only Skeleton Transmit Only Skeleton 4-2-8. Simple Debugging 4-2-9. Evaluating USB Equipment 4-3. USB Bits and Pieces 4-3-1. Device Controller Specifications 4-3-2. Overview of ML60851C Operation 4-3-3. Connecting Microcontroller to USB Controller Page 4-3-5. Building a Product 4-3-6. Vendor and Product IDs 4-3-7. Other Tools Necessary Products: Developer: 4-3-8. Note on Porting 4-3-9. Limitations 4-4. Port 7 LED2 Control 4-4-1. Port 7 Registers Port Mode Register (P7IO) Port Secondary Function Control Register (P7SF) 4-4-2. Changing LED2 Color Sample Port 7 Control Program 4-5. Standard I/O over Serial Link 4-5-1. JOB60851 Board Standard I/O 4.5.2 Serial Port Page 4-5-3. read() and write() Functions Page 4-5-4. Standard I/O Examples Sample Program Using Standard Output Sample Program Using Standard Input 4-5-5. Debugging with Standard I/O