HPC16004 datasheet(24/36 Pages) NSC

24 / 36 page

Universal Peripheral Interface

The

Universal

Peripheral

Interface

(UPI)

allows

the

HPC46064 to be used as an intelligent peripheral to another

processor The UPI could thus be used to tightly link two

HPC46064’s and set up systems with very high data ex-

change rates Another area of application could be where

an HPC46064 is programmed as an intelligent peripheral to

a host system such as the Series 32000

microprocessor

Figure 27 illustrates how an HPC46064 could be used as an

intelligent peripherial for a Series 32000-based application

The interface consists of a Data Bus (port A) a Read Strobe

(URD) a Write Strobe (UWR) a Read Ready Line (RDRDY)

a Write Ready Line (WRRDY) and one Address Input (UA0)

The data bus can be either eight or sixteen bits wide

The URD and UWR inputs may be used to interrupt the

HPC46064 The RDRDY and WRRDY outputs may be used

to interrupt the host processor

The UPI contains an Input Buffer (IBUF) an Output Buffer

(OBUF) and a Control Register (UPIC) In the UPI mode

port A on the HPC46064 is the data bus UPI can only be

used if the HPC46064 is in the Single-Chip mode

TLDD11372 25

FIGURE 27 HPC46064 as a Peripheral (UPI Interface to Series 32000 Application)

HPC16004 Datasheet(PDF) 24 Page - National Semiconductor (TI)