DP8344 datasheet(169/184 Pages) NSC

169 / 184 page

60 Reference Section (Continued)

ISP

INTERNAL STACK POINTER

Main R30 readwrite

7654

ASP3 ASP2 ASP1 ASP0 DSP3 DSP2 DSP1 DSP0

ASP3 – 0

Address Stack Pointer

Inputoutput port

of the address stack pointer Further informa-

tion Section 2118 Stack Registers

DSP3 – 0

Data Stack Pointer

Inputoutput port of the

data stack pointer Further information Section

2118 Stack Registers

NCF

NETWORK COMMAND FLAG REGISTER

Main R1 read only

TFE

RFF

LTA

DEME

RAR

ACK

POLL

TFE

Transmit FIFO Empty

Set high when the

FIFO is empty Cleared by writing to RTR

RFF

Receive FIFO Full

Set high when the Re-

ceive

FIFO

contains

received

words

Cleared by reading to RTR

Line Active

Indicates activity on the re-

ceiver input

Set high on any transition

cleared after detecting no input transitions for

16 TCLK periods

LTA

Line Turn Around

Set high when end of

message is received Cleared by writing to

RTR

writing a ‘‘1’’ to this location or by

asserting TRES

DEME

Data Error or Message End

In 3270

3299 modes asserted when a byte parity er-

ror is detected In 5250 modes asserted when

the

111

station address is decoded and

DAV is asserted Cleared by reading RTR

Undefined in 8-bit modes and in the first frame

of 3299 modes

RAR

Received Auto-Response

Set high when

a 3270 Auto-Response message 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

ACK

PollACKnowledge

Set high when a 3270

pollack command is decoded and DAV is

asserted Cleared by reading

RTR

Unde-

fined in 5250 and 8-bit modes and in the first

frame of 3299 modes

POLL

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

Further information Section 30 Transceiver

169

DP8344 Datasheet(PDF) 169 Page - National Semiconductor (TI)

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