DP8344BV National Semiconductor, DP8344BV Datasheet - Page 56

• Manufacturer Part Number: DP8344BV
• Description: IC BIPHASE COMM PROCESSR 84-PLCC
• Manufacturer: National Semiconductor

Specifications of DP8344BV

• Processor Type: 8-Bit RISC
• Speed: 20MHz
• Voltage: 4.5 ~ 5.5V
• Mounting Type: Surface Mount
• Package / Case: 84-PLCC
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: *DP8344BV

3 0 Transceiver
lates odd parity on the data byte (B2–B9) and transmits this
value for B10 If TCR 2
parity calculated on B1–B11 and transmitted as B12 the
frame delimiter If OWP is high odd parity is output other-
wise even parity is transmitted In this manner the system
designer is provided with maximum flexibility in defining the
transmitted 3270 control bits (B10–B12)
When data is written to RTR
TCR 0
TCR are loaded into the FIFO along with the data being
Odd Word Parity OWP controls the type of
(Continued)
is high B10 takes the state of
FIGURE 3-9 3270 3299 Frame Assembly Disassembly Procedure
the least significant 4 bits of
(a) 3270 Data and Command Frames
(b) 3299 Address Frame
56
written to RTR
be used for more than one frame of a multi-frame transmis-
sion or changed for each frame
When a 3270 frame is received and decoded the decoder
loads the parallel data into the receive FIFO where it propa-
gates through to the last location and is mapped into RTR
and TSR
ty BP is odd parity on B2 – B9 calculated in the decoder
Reading RTR will advance the receive FIFO therefore
TSR must be read first if this information is to be utilized
Bits B2– B11 are exactly as received Byte Pari-
The same TCR contents can therefore
TL F 9336 – 48
TL F 9336– 47