NS32FV100 Datasheet, PDF (7/96 Pages) Texas Instruments – NS32FX100 NS32FV100 NS32FX200 System Controller

1 0 Fax-System Configuration
A typical FAX system based on the NS32FX100
NS32FX200 or NS32FV100 is shown in Figure 1-1
A few external components are required to implement the
analog part of the CODEC
1 1 BLOCK DIAGRAM DESCRIPTION
CPU The typical FAX system shown below is based on a
single embedded processor The choice between the
NS32FX161 NS32FV16 and the NS32FX164 depends on
the specific application requirements
System Chip The FAX-system chip interfaces between
FAX-system peripheral devices such as motors printers
and scanners and the embedded processor The chip con-
tains FAX-system elements such as CODEC DMA Control-
Memory The NS32FX100 directly controls ROM and
SRAM Both the NS32FX200 and the NS32FV100 directly
control DRAM in addition to ROM and SRAM
Memory access time is also controlled by the NS32FX100
thus allowing the designer to tune memory price and system
performance
MICROWIRE The serial channel with programmable inter-
face parameters can be used by advanced FAX systems to
interface with other devices (such as EEPROMs)
ler Interrupt Control Unit and counters
UART This serial channel with programmable interface pa-
Scanner Either a Charge-Coupled Device (CCD) scanner
or a Contact Image Sensor (CIS) scanner may be used The
rameters can be used by advanced fax systems to commu-
nicate with other devices (e g host machines)
NS32FX100 incorporates most of the video circuits such as
shading compensation dithering and digitizing which are
required for the scanner interface
Printer A Thermal Print Head (TPH) can be connected di-
rectly to the NS32FX100 Other types of printer engine
such as laser or ink-jet can easily be interfaced to the
NS32FX100 via an additional small ASIC
Motors The NS32FX100 controls two stepper motors The
only external components required to operate the motors
te ^{are buffers drivers}
DAA I F The telephone line is accessed via a Data Access
Arrangement (DAA) The NS32FX100 contains the digital
Obsole ^{part of a Sigma-Delta CODEC which connects to the DAA}
I O Pins General purpose I O pins are used both to moni-
tor (e g ring detector read) and control (e g scanner light
control) the FAX-system peripheral devices
DMA Channels
NS32FX100 and NS32FV100 The NS32FX100 and
NS32FV100 have three DMA channels which are used to
interface the scanner and the printer All three channels
may be allocated for external usage (e g Centronics paral-
lel interface Ethernet)
NS32FX200 The NS32FX200 has four DMA channels
Three channels are used by the NS32FX200 to interface to
the scanner and the printer and one channel is for external
usage All four channels may be allocated for external us-
age (e g Centronics parallel interface Ethernet)
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