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Cypress Semiconductor Corporation

SL811HS and SL811HST: Application Notes

and specifications contained in this document are subject to change without

notice.

Date: 07/26/01

Revision: 1.21

Page: 24

SL811HS provides two EP0Status=0x03 and EP0Counter =0x04 registers for setting USB

device PID, Endpoint, and Address. SL811HS host mode allows the user to setup any of the

16 endpoints and any of the 127 addresses.

ep = (crc>>7) & 0xf; ep = (crc>>7) & 0xf;

data0 = 0x10; // Memory start data0 = 0x10; // Memory start

SL11Write(EP0Address, (BYTE)data0); // DATA0

... ...

// Setup PID, Endpoint, and device Address // Setup PID, Endpoint, and device Address

SL11Write(EP0Status, (BYTE)( (pid << 4) + ep ) ); SL11Write(EP0Status, (BYTE)( (pid << 4) + ep ) );

SL11Write(EP0Counter, (BYTE)(crc & 0x7f)); SL11Write(EP0Counter, (BYTE)(crc & 0x7f));

// setup 3 // setup 3--byte header + payloadbyte header + payload

SL11Write(EP0XferLen,(BYTE)(payload));

... ...

// setup next ping // setup next ping--pong bufferpong buffer

data1 = data0 + payload; // next buffer data1 = data0 + payload; // next buffer

... ...

4.1.8 Single IN Packet

Example of a single IN Packet transaction: The IN Packet includes transmission of IN PID with

device address and endpoint. The device responds with either DATA0 or DATA1 token and

data payload. The program sample shows PID IN packet followed by a Data0 packet. For

continuous IN packets, the device is required to toggle Data tokens i.e., Data0, Data1, and so

on.

Program Sample 8: Single IN Packet

short addr = 3; // address 3 short addr = 3; // address 3

... ...

SL11Write(EP0Address, (BYTE)cMemStart); // DATA0 SL11Write(EP0Address, (BYTE)cMemStart); // DATA0

// PID_IN and endpoint 1 // PID_IN and endpoint 1

SL11Write(EP0Status, ((PID_IN & 0xff SL11Write(EP0Status, ((PID_IN & 0xff)<<4) | 1); // PID + ep)<<4) | 1); // PID + ep

SL11Write(EP0Counter, addr); SL11Write(EP0Counter, addr);

SL11Write(EP0XferLen,payload); // payload SL11Write(EP0XferLen,payload); // payload

SL11Write(EP0Control,DATA0_RD); SL11Write(EP0Control,DATA0_RD);

USB Trace 2: IN Packet

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