
Preliminary Information
MT9071
185
Bit
Name
Functional Description
15
14
13
12
11
10
9
8
ADR26
ADR25
ADR24
ADR23
ADR22
ADR21
ADR20
A2EN
HDLC Second Address 6-0 Comparison.
A seven bit address used for comparison with the
second byte of the HDLC received address. Control bits A2EN of this register and control bit
ADREC of the T1 & E1 HDLC Control 0 - R/W Address YF2 must be both set high for this
address to take effect. ADR26 is the MSB.
HDLC Second Address Comparison Enable.
When high, the above HDLC Second Receive
Address is used in the comparison of the HDLC received second address byte. Control bit
ADREC of the T1 & E1 HDLC Control 0 - R/W Address YF2 must also be set high for this
address to take effect. For a 13 or 14 bit all call address (hex 1FFF or 3FF) to take effect, both
A1EN and A2EN must be set.
HDLC First Address 6-0 Comparison.
A seven bit address used for comparison with the first
byte of the HDLC received address. Control bits A1EN of this register and control bit ADREC of
the T1 & E1 HDLC Control 0 - R/W Address YF2 must be both set high for this address to take
effect. Six bit address recognition is used when ADR10 is disabled by clearing control bit
SEVEN of the above register. ADR16 is the MSB.
7
6
5
4
3
2
1
0
ADR16
ADR15
ADR14
ADR13
ADR12
ADR11
ADR10
A1EN
HDLC First Address Comparison Enable.
When high, the above HDLC First Receive Address
is used in the comparison of the HDLC received first address byte. Control bit ADREC of the T1
& E1 HDLC Control 0 - R/W Address YF2 must also be set high for this address to take effect.
For a 6 or 7 bit all call address (hex 3F or 7F) to take effect, only A1EN must be set.
Table 181 - T1 & E1 HDLC Address Recognition Control - R/W Address YF4
Bit
Name
Functional Description
15-8 (#### ####) Not Used
7
6
5
4
3
2
1
0
TXF0
TXF7
TXF6
TXF5
TXF4
TXF3
TXF2
TXF1
HDLC Transmit FIFO Data.
This byte is tagged with the two status bits EOP and FA from T1
& E1 HDLC Control 1 - R/W Address YF3, and the resulting 10 bit word is sent to the Transmit
FIFO. The Transmit FIFO status is not changed immediately when a transmitter read or
processor write occurs. It is updated after the data has settled and the transfer to the last
available position has finished.
Table 182 - T1 & E1 HDLC Transmit FIFO Data - R/W Address YF5
Bit
Name
Functional Description
15-8 (#### ####) Not Used
7
6
5
4
3
2
1
0
TPS0
TPS7
TPS6
TPS5
TPS4
TPS3
TPS2
TPS1
Transmit Packet Size.
An eight bit register which must be loaded with the length of the packet
about to be transmitted through the Transmit FIFO (T1 & E1 HDLC Transmit FIFO Data - R/W
Address YF5). This value is also the start value for the counter detailed in Table 127 - T1 & E1
HDLC Test and Transmit Byte Status - R/W Address Y1C.
Table 183 - T1 & E1 HDLC Transmit Packet Size - R/W Address YF6