AC4490 Hardware Integration Guide
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Baud Rate
BaudL (0x42) BaudH (0x43)
Minimum Interface
Timeout (0x58)
Stop Bit Delay
(0x3F)
28800
0xF8
0x00
0x02
0x0E
19200
0xF4
0x00
0x03
0x19
14400
0xF0
0x00
0x04
0x23
9600
0xE8
0x00
0x05
0x39
4800
0xD0
0x00
0x09
0x7A
2400
0xA0
0x00
0x11
0xFC
1200
0x40
0x00
0x21
0x00
2
1.
57600 is the default baud rate
2.
0x00 yields a stop bit of 421 µSec. The stop bit at 1200 baud should be 833 µSec.
OEM Host Data Rate
The OEM host data rate is the rate with which the OEM host and transceiver communicate over the serial
interface. This rate is independent of the RF baud rate, which is fixed at 76.8 Kbps. Possible values range
from 1200 bps to 115200 bps.
R
ADIO
I
NTERFACE
Protocol Status / Receive Acknowledgement
Note: Implemented in firmware v6.3 and later.
When enabled in EEPROM, GO0 and GO1 perform the functions of Protocol Status and Receive
Acknowledgement.
Protocol Status
Every time the radio hops to hop bin 0, the radio asserts GO0 Low for the entire hop bin. GO0 goes low at
the falling edge of the hop frame at the start of bin 0 and goes high with the rising edge of hop frame at the
end of bin 0. During all other hops, GO0 is high.
Note: This mode is incompatible with Modem mode.
Receive Acknowledgement
The radio uses GO1 to signal that a valid RF acknowledgement has been received from the remote radio.
GO1 is normally low and goes high within approximately 75 µSec of receiving a valid RF acknowledgement. It
remains high until the end (rising edge) of the next hop.
Note: This mode is incompatible with Modem mode.
Flow Control
CTS On/CTS On Hysteresis (Flow Control)
Flow control refers to the control of data flow between transceivers. It is the method used to handle data in
the transmit/receive buffer and determines how data flow between the transceivers is started and stopped.
