ATA5811-PLQX Atmel, ATA5811-PLQX Datasheet - Page 58

• Manufacturer Part Number: ATA5811-PLQX
• Manufacturer: Atmel

Specifications of ATA5811-PLQX

• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 7mm
• Product Height (mm): 0.9mm
• Product Length (mm): 7mm
• Lead Free Status / Rohs Status: Compliant

TX Operation
58
ATA5811/ATA5812 [Preliminary]
The transceiver is set to TX operation by using the bits OPM0 and OPM1 in the control
register 1.
Table 40. Control Register 1
Before activating TX mode, the TX parameters (baud rate, modulation scheme ... ) must
be selected as illustrated in Figure 50 on page 59. The baud rate depends on Baud 0
and Baud 1 in control register 6, Lim_min0 to Lim_min5 in control register 5 and XLIM in
control register 4 (see section “Control Register”). The modulation is selected with
ASK_/NFSK in control register 4. The FSK frequency deviation is fixed to about
±
is active (NRZ, see Table 41 on page 61).
After the transceiver is set to TX mode the start-up mode is active and the PLL is
enabled. If the PLL is locked, the TX mode is active.
If the transceiver is in start-up or TX mode, the TX/RX data buffer can be loaded via the
4-wire serial interface. After the first byte is in the buffer and the TX mode is active, the
transceiver starts transmitting automatically (beginning with the MSB). While transmit-
ting it is permanently possible to load new data in the TX/RX data buffer. To prevent a
buffer overflow or interruptions during transmitting the user must ensure that data is
loaded at the same speed as it is transmitted.
There is a counter that indicates the number of bytes to be transmitted (see section
“Transceiver Configuration”). If a byte is loaded, the counter is incremented, if a byte is
transmitted, the counter is decremented. The counter value is available via the 4-wire
serial interface. An IRQ is issued, if the counter while counting backwards reaches the
value defined by the control bits IR0 and IR1 in control register 1.
Note:
If T_Mode in control register 1 is set to 1, the transceiver is in TX transparent mode. In
this mode the TX/RX data buffer is disabled and the TX data stream must be applied on
pin SDI_TMDI. Figure 50 on page 59 illustrates the flow chart of the TX transparent
mode.
16 kHz. If P_Mode is set to 1, the Manchester modulator is disabled and pattern mode
Writing to the control register 1, 4, 5 or 6 during TX mode, resets the TX/RX data buffer
and the counter which indicates the number of bytes to be transmitted.
OPM1
0
OPM0
1
Function
TX mode
4689B–RKE–04/04