dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 169

• Manufacturer Part Number: dp8344b
• Description: Biphase Communications Processor?bcp
• Manufacturer: National Semiconductor Corporation

6 0 Reference Section
ISP INTERNAL STACK POINTER
ASP3 – 0
DSP3 – 0
ASP3 ASP2 ASP1 ASP0 DSP3 DSP2 DSP1 DSP0
Main R30 read write
7
6
Data Stack Pointer
data stack pointer Further information Section
2 1 1 8 Stack Registers
Address Stack Pointer
of the address stack pointer Further informa-
tion Section 2 1 1 8 Stack Registers
5
4
3
Input output port of the
(Continued)
2
Input output port
1
0
169
NCF NETWORK COMMAND FLAG REGISTER
TFE
RFF
LA
LTA
DEME
RAR
ACK
POLL
Main R1 read only
TFE
7
RFF
6
Transmit FIFO Empty
FIFO is empty Cleared by writing to RTR
Receive FIFO Full
ceive FIFO contains 3 received words
Cleared by reading to RTR
Line Active
ceiver input
cleared after detecting no input transitions for
16 TCLK periods
Line Turn Around
message is received Cleared by writing to
asserting TRES
Data Error or Message End
3299 modes asserted when a byte parity er-
ror is detected In 5250 modes asserted when
the 111 station address is decoded and
Undefined in 8-bit modes and in the first frame
of 3299 modes
Received Auto-Response
a 3270 Auto-Response message is decoded
and DAV is asserted Cleared by reading
and in the first frame of 3299 modes
Poll ACKnowledge
poll ack command is decoded and DAV is
asserted Cleared by reading RTR
fined in 5250 and 8-bit modes and in the first
frame of 3299 modes
POLL
is decoded and DAV is asserted Cleared by
reading RTR
modes and in the first frame of 3299 modes
Further information Section 3 0 Transceiver
DAV is asserted Cleared by reading RTR
RTR
RTR
LA
5
LTA
writing a ‘‘1’’ to this location or by
Undefined in 5250 and 8-bit modes
4
Set high when a 3270 poll command
DEME
Set high on any transition
Undefined in 5250 and 8-bit
3
Indicates activity on the re-
Set high when the Re-
RAR
Set high when end of
Set high when a 3270
2
Set high when the
ACK
Set high when
1
In 3270
POLL
Unde-
0