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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.14.3.5.2 TX Length Byte1 Register (0x1D), TX Length Byte2 Register (0x1E)
Table 6-57. TX Length Byte1 Register (0x1D)
Function: High 2 nibbles of complete, intended 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
B7
B6
B5
B4
B3
B2
B1
B0
Name
Txl11
Txl10
Txl9
Txl8
Txl7
Txl6
Txl5
Txl4
Function
Number of complete byte
bn[11]
Number of complete byte
bn[10]
Number of complete byte
bn[9]
Number of complete byte
bn[8]
Number of complete byte
bn[7]
Number of complete byte
bn[6]
Number of complete byte
bn[5]
Number of complete byte
bn[4]
Description
High nibble of complete, intended bytes to be transmitted
Middle nibble of complete, intended bytes to be transmitted
Table 6-58. TX Length Byte2 Register (0x1E)
Function: Low nibbles of complete bytes to be transferred through FIFO; Information about a broken byte and number of bits to be
transferred from it
Default: 0x00 at POR and EN = 0. It is also automatically reset at TX EOF
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Name
Txl3
Txl2
Txl1
Txl0
Bb2
Bb1
Bb0
Bbf
Function
Number of complete byte
bn[3]
Number of complete byte
bn[2]
Number of complete byte
bn[1]
Number of complete byte
bn[0]
Broken byte number of bits
bb[2]
Broken byte number of bits
bb[1]
Broken byte number of bits
bb[0]
Broken byte flag
Description
Low nibble of complete, intended 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.
B0 = 1, indicates that last byte is not complete 8 bits wide.
Copyright ? 2011–2014, Texas Instruments Incorporated
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