KL5KUSB121

USB to 10/100 Ethernet Controller

Kawasaki LSI

5

Ver. 1.1

PRELIMINARY

Pin #

LQFP

I/O

Pin Name

Description

98

IN/OUT

XD_14

External Data Pins

99

IN/OUT

XD_15

External Data Pins

100

IN

VDD

VDD

Function Description

16 Bit Processor

The integrated 16 bit processor serves as a micro controller for USB peripherals. The

processor can execute approximately five million instructions per second.

With this

processing power it allows the design of intelligent peripherals that can process data prior

to passing it on to the host PC, thus improving overall performance of the system. The

masked ROM (4K X 16) in the KL5KUSB121 or external memory contains a specialized

instruction set that has been designed for highly efficient coding of processing algorithms

and USB transaction processing.

The 16-bit processor is designed for efficient data execution by having direct access to

the RAM Buffer, external memory, I/O interfaces, and all the control and status registers.

The divide/multiply feature expands the capability of USB peripherals.

The processor supports prioritized vectored hardware interrupts. In addition, as many as

240 software interrupt vectors are available.

The processor provides six addressing modes, supporting memory-to-memory, memory-

to-register,

register-to-register,

immediate-to-register

or

immediate-to-memory

operations. Register, direct, immediate, indirect, and indirect indexed addressing modes

are supported. In addition, there is an auto-increment mode in which a register, used as

an address pointer is automatically incremented after each use, making repetitive

operations more efficient both from a programming and a performance standpoint.

The processor features a full set of program control, logical, and integer arithmetic

instructions.

All instructions are sixteen bits wide, although some instructions require

operands, which may occupy another one or two words.

Several special “ short

immediate” instructions are available, so that certain frequently used operations with

small constant operand will fit into a 16-bit instruction.

RAM Buffer

The USB controller contains a 3K byte (1.5K X 16) internal buffer memory. The memory

is used to buffer data and USB packets and accessed by the 16 Bit processor and the

SIE.

USB transactions are automatically routed to the memory buffer.

The 16-bit

processor has the ability to set up pointers and block sizes in buffer memory for USB

transactions. Data is read from the interface and is processed and packetized by the 16-

bit I/O processor.