DP8344 datasheet(177/184 Pages) NSC

177 / 184 page

60 Reference Section (Continued)

623 Bit Definition Tables

(Continued)

6232 Transceiver

(Continued)

Table includes control and status bits only It does not include definitions of bit fields provided for the formatting (de-formatting)

data frames For further information see the Transceiver section

Bit

Name

Location Reset State

Function

Receiver

SLR

elect Line

TCR 5

Selects the receiver input source

Control

eceiver

SLR

Source

(Continued)

DATA-IN

On-Chip Analog

Line Receiver

Transmitter

ransmitter Active TSR 6

Reflects the state of TX-ACT indicating that data is being

transmitted Is not disabled by LOOP

Status

TFE

ransmit FIFO

NCF 7

Set high when the FIFO is empty Cleared by writing to

RTR

mpty

TFF

ransmit FIFO

TSR 7

Set high when the FIFO is full

RTR must not be written

when TFF is high

ull

Receiver

ACK

poll

NCF 1

Set high when a 3270 pollack command is decoded and

DAV is asserted Cleared by reading RTR

Undefined in

Status

ACK

nowledge

5250 and 8-bit modes and in the first frame of 3299 modes

DAV

ata AVailable

TSR 3

Set high when valid data is available in RTR and TSR

Cleared by reading RTR

or when an error is detected

DEME

ata Error or

NCF 3

In 3270 or 3299 modes asserted when a byte parity error is

detected In 5250 modes asserted when the 111 station

essage End

address is decoded and DAV is asserted Undefined in 8-bit

modes and first frame of 3299 modes

ine Active

NCF 5

Indicates activity on the receiver input Set high on any

transition cleared after no input transitions are detected for

16 TCLK periods

LTA

ine Turn Around

NCF 4

Set high when an end of message is detected Cleared by

writing to RTR

writing a ‘‘1’’ to LTA or by asserting

TRES

POLL

NCF 0

Set high when a 3270 Poll command is decoded and DAV is

asserted Cleared by reading RTR

Undefined in 5250 and

8-bit modes and in the first frame of 3299 modes

eceiver Active

TSR 4

Set high when a valid start sequence is received Cleared

when either an end of message or an error is detected

RAR

eceived

NCF 2

Set high when a 3270 Auto-Response message is decoded

and DAV is asserted Cleared by reading RTR

Undefined

uto-Response

in 5250 and 8-bit modes and in the first frame of 3299 modes

eceiver Error

TSR 5

Set high when an error is detected Cleared by reading ECR

or by asserting TRES

RFF

eceive FIFO

NCF 6

Set high when the receive FIFO contains 3 received words

Cleared by reading RTR

ull

177

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