Silicon Laboratories Si4430, Manual

Page: 116 / 152

S i 4 4 3 0
116 Preliminary Rev. 0.4
Reset value = 00000000
Reset value = 00000000
Reset value = 00000000
Check Header bytes 3 to 0 are checked against the corresponding bytes in the Received Header if the check is
enabled in “Register 31h. EZMAC
®
Status,” on page 110.
Register 3Ch. Transmit Header 1
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name
txhd[15:8]
Type
R/W
Bit Name Function
7:0 txhd[15:8]
Transmit Header 1.
2
nd
byte of the header to be transmitted.
Register 3Dh. Transmit Header 0
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name
txhd[7:0]
Type
R/W
Bit Name Function
7:0 txhd[7:0]
Transmit Header 0.
1
st
byte of the header to be transmitted.
Register 3Eh. Packet Length
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name
pklen[7:0]
Type
R/W
Bit Name Function
7:0 pklen[7:0]
Packet Length.
The value in the pklen[7:0] register corresponds directly to the number of bytes in the
Packet. For example pklen[7:0] = ‘00001000’ corresponds to a packet length of 8 bytes.
The maximum packet length is pklen[7:0] = ‘11111111’, a 255 byte packet. Writing 0 is
possible, in this case we do not send any data in the packet. During RX, if
fixpklen = 1
,
this will specify also the Packet Length for RX mode.