SL811S/T
Document #: 38-08009 Rev. **
Page 5 of 27
1.0
Conventions
1,2,3,4
Numbers without annotations are decimals
Dh, 1Fh, 39h
Hexadecimal numbers are followed by an “h”
0101b, 010101b
Binary numbers are followed by a “b”
bRequest, n
Words in italics indicate terms defined by USB Specification or by this specification
2.0
Definitions
USB
Universal Serial Bus
SL811S/T
SL811S/T is a Cypress USB Controller, providing multiple functions on a single chip. The SL811S/T is
available in both a 28-pin PLCC package, and a 48-pin LPQFP package (SL811ST)
SL811S/T
SL811S/T refers to both the SL811S and SL811ST.
Note: This chip does not include a CPU.
3.0
References
[Ref 1] USB Specification 1.1: http://www.usb.org
4.0
Introduction
4.1
Overview
The SL811S/T USB Slave Controller is a single chip USB peripheral device that interfaces to microprocessors. The SL811S/T
USB Controller incorporates USB Serial Interface functionality along with internal drivers and receivers that connect directly to
the USB interface connector. The SL811S/T supports and operates in USB full speed mode, at 12 Mbits per second and in USB
Slow speed mode at 1.5 Mbits per second.
The local host interface provides an 8-bit data path, with interrupt and DMA support to allow an easy interface to standard
microprocessors or microcontrollers. Internally, the SL811S/T contains a 256-byte RAM data buffer. The RAM contains both
control registers and data buffers. SL811S/T comes in two packages - 28-pin PLCC (SL811S) and 48-pin LPQFP (SL811T). Both
products require a 3.3 VDC power supply.
The SL811S/T can interface to any microprocessor, microcontroller, or DSP. It can also interface directly to a variety of buses
including ISA, PCMCIA and others through its 8-bit bidirectional Data port and through the following control signals - CS, WR,
RD, INTR, and A0. Both INTEL and MOTOROLA buses, and others like them, are supported.
The SL811S/T USB Slave Controller is designed to conform to USB specification 1.1 for full-speed, and low speed operation.
The USB specification should be referred to as a reference when designing with the SL811S/T.
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