Rev. 3.0, 03/01, page 139 of 390
(7) Tx Control 2 Register (ITC2R)
Address: H'10007108 (Bank 0, Read/ Write)
Bit
7
6
5
4
3
2
1
0
Bit Name
SB
ACRCG
SIP
NSFP
EEIL3
EEIL2
EEIL1
EEIL0
Initial Value
0
1
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit
Description
Default
7
Send Break (SB)
Send Break: Setting this bit to ‘1’ causes the transmitter to transmit zeros.
0
6
Automatic CRC Generation (ACRCG)
Setting this bit to ‘1’ enables automatic CRC generation of all outgoing packets. The CRC
is automatically generated by the transmitter logic and transmitted after the data field, but
before the ending flag.
Setting this bit to ‘0’ disables CRC generation. This allows transmission of packets already
containing a valid CRC.
1
5 - 4
SIR Interaction Pulse Control (SIP)
Commands the 4Mbit modem to send a SIR Interaction Pulse based on the bit setting. A
‘01’ bit setting instructs the 4Mbit modem to transmit a SIP at the end of current packet. A
‘10’ bit setting instructs the 4Mbit modem to transmit a SIP immediately, regardless of the
modem current activity. Note: SIP control bits are self-clearing.
00
3
Number of Starting Flags or Preambles (NSFP)
Specifies the number of starting flags or preambles to transmit for a given packet.
Setting this bit to ‘1’ causes only two starting flags or a single preamble to be transmitted
per packet.
Setting this bit to ‘0’ causes several starting flags or preambles to be transmitted.
0
2 - 0
Early EOM Interrupt Level (EEIL[2:0])
Early EOM Interrupt Level: b2 b1 b0 Early EOM Interrupt Level
0 0 0 Interrupt by EOM Only
0 0 1 Tx byte Count = 16
0 1 0 Tx Byte Count = 32
0 1 1 Tx byte Count = 64
1 0 0 Tx Byte Count = 128
1 0 1 Tx Byte Count = 256
1 1 0 Tx Byte Count = 512
1 1 1 Tx byte Count = 1024
000
Содержание HD64465
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