Texas Instruments TRF7960 Manual page 33

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5.3.4 FIFO Control Registers
Low nibbles of complete bytes to be transferred through FIFO; Information about a broken byte and number of bits to be transferred from it
Bit Bit Name Function
B7 RFU Set to LOW
B6 Fhil FIFO level HIGH
B5 Flol FIFO level LOW
B4 Fove FIFO overflow error
B3 Fb3 FIFO bytes fb[3]
B2 Fb2 FIFO bytes fb[2]
B1 Fb1 FIFO bytes fb[1]
B0 Fb0 FIFO bytes fb[0]
High 2 nibbles of complete bytes to be transferred through FIFO
Register default is set to 0x00 at POR and EN=0. It is also automatically reset at TX EOF
Bit Bit Name Function
B7 Txl11 Number of complete byte bn[11]
B6 Txl10 Number of complete byte bn[10]
B5 Txl9 Number of complete byte bn[9]
B4 Txl8 Number of complete byte bn[8]
B3 Txl7 Number of complete byte bn[7]
B2 Txl6 Number of complete byte bn[6]
B1 Txl5 Number of complete byte bn[5]
B0 Txl4 Number of complete byte bn[4]
Low nibbles of complete bytes to be transferred through FIFO; Information about a broken byte and number of bits to be transferred from it
Register default is set to 0x00 at POR and EN=0. It is also automatically reset at TX EOF
Bit Bit Name Function
B7 Txl3 Number of complete byte bn[3]
B6 Txl2 Number of complete byte bn[2]
B5 Txl1 Number of complete byte bn[1]
B4 Txl0 Number of complete byte bn[0]
B3 Bb2 Broken byte number of bits bb[2]
B2 Bb1 Broken byte number of bits bb[1]
B1 Bb0 Broken byte number of bits bb[0]
B0 Bbf Broken byte flag
Copyright © 2006–2010, Texas Instruments Incorporated
Table 5-26. FIFO Status (1Ch)
Comments
Reserved for future use (RFU)
Indicates that 9 bytes are already in the FIFO (for RX)
Indicates that only 3 bytes are in the FIFO (for TX)
Too much data was written to the FIFO
Bits B0:B3 indicate how many bytes that are loaded in FIFO were not read
out yet (displays N – 1 number of bytes). If 8 bytes are in the FIFO, this
number is 7.
Table 5-27. TX Length Byte1 (1Dh)
Comments
High nibble of complete bytes to be transmitted
Middle nibble of complete bytes to be transmitted
Table 5-28. TX Length Byte2 (1Eh)
Comments
Low nibble of complete bytes to be transmitted
Number of bits in the last broken byte to be transmitted.
It is taken into account only when broken byte flag is set.
If 1, indicates that last byte is not complete 8 bits wide.
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SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
System Description
TRF7960
TRF7961
33