Z80 datasheet(246/330 Pages) ZILOG

246 / 330 page

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7UGT /CPWCN

UM008101-0601

Serial Input/Output

226

Figure 109. Transmit and Receive Data Path

Functional Description

The functional capabilities of the Z80 SIO are described in two ways: as a

data communications device, and as a Z80 family peripheral.

As a data communications device, The S80 SIO transmits and receives

serial data, and meets the requirements of various data communications

protocols. As a Z80 family peripheral, it interacts with the Z80 CPU and

other Z80 peripheral, circuits, and shares their data, address and control

Receive

Error

Logic

I/O Data Buffer

CPU I/O

Internal Data Bus

Receive

Clock

Logic

ASYNC Data

CRC Delay

(8 Bits)

SYNC-

CRC

RxDA

RxCA

Hunt Mode (BISYNC)

3Bits

1-Bit

Delay

CRC

Checker

SYNC

SDLC-CRC

CRC Result

SYNC-CRC

Transmit

Clock Logic

SYNC Data

SDLC-CRC

ASYNC Data

Transmit

Multiplexer

and

TxDA

TxCA

20-Bit Transmit Shift Register

Start Bit

Transmit

WR7

SYNC

and Zero

Delay

WR6

SYNC

Data

SDLC Data

CRC

Generator

2-Bit

Zero

(5 Bits)

Insert

Delete

Receive

S.R.

(8 Bits)

Receive

Error

FIFO

Receive

Error

FIFO

Z80 Datasheet(PDF) 246 Page - Zilog, Inc.

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