Intel mcs-48 manual LI3, Block Oiagram

8273, 8273-4, 8273·8

PROGRAMMABLE HOLC/SOLC PROTOCOL

CONTROLLER

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CCITT X.25 Compatible

HDLC/SDLC Compatible

Full Duplex, Half Duplex, or Loop SDLC Operation

Up to 64K Baud Synchronous Transfers

Automatic FCS (CRC) Generation and Checking

Up to 9.6K Baud with On·Board Phase Locked Loop

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Programmable NRZI Encode/ Decode

Two User Programmable Modem Control Ports

Digital Phase Locked Loop Clock Recovery

Minimum CPU Overhead

Fully Compatible with 8048/8080/8085/ 8088/8086 CPUs

Single +5V Supply

The Intel@ 8273 Programmable HOLC/SOLC Protocol Controller is a dedicated device designed to support the ISO/ CCITT'sHOLC and IBM'sSOLC communication line protocols. It is fully compatible with Intel'snew high performance microcomputer systems such as the MCS-88/86™. A frame level command set is achieved by a unique microprogrammed dual processor chip architecture. The processing capability supported by the 8273 relieves the system CPU of the low level real-time tasks normally associated with controllers.

PIN CONFIGURATION

flAG DET	Vee
Tx tNT	1'1!;
eLK	l'I3
RESET	l'I3
TxOACK	PT,
TxDRQ	;m
RxDACK	PA,
RxDRQ	PA,
R5	'A2
WR	CIl
R;I( tNT	eTS
DB.	T,D
DB'	'fie
DB'	RiC
DB3	R,D
DB.	ffiC[K
DB'	cs
DBS	CPU
DB7	A,
GND	Ao

PIN NAMES

DBO-DB7	DATA BUS fS BITS)	CS	CHIP SELECT
~ FLAG DETECT		Him	32 TIMES CLOCK
TxtNT	TRANSMITTER INTERRUPT	Alt 0	RECEIVER DATA
elK	CLOCK INPUT	Ax C	RECEIVER CLOCK
RESET	RESET	r" C	TRANSMITTER CLOCK
'fi"'OAfR	TRANSMITTER DMA ACKNOWLEDGE	Tx 0	TRANSMITTER OATA
TxORO	TRANSMITTER DMA REQUeST	rn	CLEAR TO SEND
1m	READ INPUT	co	CARRIER DETECT
""	WRITE INPUT	~:2-::4	GP INPUT PORTS
Ri"'5ACR'	RECEIVER DMA ACKNOWLEDGE	m- 4	~~g~::~~6~:~~
Ax ORO	RECEIVER DMA REQUEST
Ax INT	RECEIVER INTERRUPT	Vee	+5 VOL T SUPPLY
AD-A1	COMMAND REGISTER SELECT ADDRESS	GND	GROUND
lSISLL	DIGITAL PHASE LOCKED LOOP

BLOCK OIAGRAM

080- 7

TxDRQ

TxDACK

RxDACK

TxlNT

RxlNT

WR

Ao

A,

RESET

cs

CPU INTERFACE

T,D

r;c

DPLL

32XCiJ(

RTs

PB'_4

ffi

Co

PA2_ 4

R,D

R;C

f'lAGDET

MODEM INTERFACE

9-67