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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: 15

3. PROGRAMMING INFORMATION

3.1. Host and Device Programming

The SL811HS supports auto increment mode for Read/Write Cycles in the A0 mode. In A0

mode, the Micro Controller sets up the address only once. On any subsequent DATA

Read/Write access, the internal address pointer will advance to the next DATA location.

In A0 mode (shown in the diagram above), the internal register address is input to the device in

a normal I/O or memory mapped I/O write operation with the A0 address select input driven low

('0'). This operation results in the address being latched internally so that the subsequent Read

or Write operation with A0 driven high ('1') will result in a data transfer.

REG/MEMORY ADDRESSREG/MEMORY ADDRESS

REG/MEMORY DATA REG/MEMORY DATA

D7D7 D6D6 D5D5 D4D4 D3D3 D2D2 D1D1 D0D0

A0A0

'0''0'

'1'

A0A0 D7D7 DD66 D5D5 D4D4 D3D3 D2D2 D1D1 D0D0

SL811H Register/Memory I/O OperationsSL811H Register/Memory I/O Operations.

WRITEWRITE

ADDRESSADDRESS

READ/WRITEREAD/WRITE

1.1.

2.2.

REGISTERREGISTER

OROR

MEMORYMEMORY

1. Write Address to I/O location with A0 = '0'.1. Write Address to I/O location with A0 = '0'.

2. Read/Write data from/to location. A0 = '1'.2. Read/Write data from/to location. A0 = '1'.

3.2. SL811HS USB Control Registers

The SL811HS can communicate to any USB Device with any type of configuration or function

including any specific endpoints via the USB control registers. The SL811HS can address up

to 127 devices and 16 endpoints.

Each endpoint has an associated set of registers (this is further described in the SL811HS

specification). Each must be programmed in order to initiate or respond to transactions on the

USB. The host initiates USB Control Register’s transactions during setup and configuration.

Typically, the host will request information from the device during setup to determine the

device's characteristics, and assign a USB ID to the device. The complete definition of control

messages and transactions are defined in Chapter 9 of the USB Specification 1.1.

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