MT9076B Datasheet, PDF (153/172 Pages) Zarlink Semiconductor Inc – T1/E1/J1 3.3 V Single Chip Transceiver

MT9076B
Data Sheet
Bit
Name
Functional Description
7-0 TxCNT15-8 Extended Transmit Byte Count Register. This register, along with the Transmit Byte
Count Register indicates the length of the packet about to be transmitted. Values
programmed into this register are not internally updated until the next write to the Low
Transmit Byte Count Register. When the internal counter decrements to one, the next
write to the Tx FIFO will be tagged as an end of packet byte. The counter decrements at
the end of the write to the Tx FIFO. If the Cycle bit of Control Register 2 is set high, the
counter will cycle through the programmed value continuously.
Table 172 - Extended Transmit Byte Count Register
(Pages B,C, and D, Address 1FH)
23.0 Transmit National Bit Buffer (Page 0EH)
Page 0EH, address 10H to 14H contain the five bytes of the transmit national bit buffer (TNBB0 - TNBB4
respectively). This feature is functional only when control bit NBTB (page 01H, address 17H) is one.
Bit
Name
Functional Description
7-0
TNBBn.F1
-
TNBBn.F15
Transmit S_an+4 Bits Frames 1 to 15. This byte contains the bits transmitted in bit position
n+4 of channel zero of frames 1, 3, 5, 7, 9, 11, 13 and 15 when CRC-4 multiframe
alignment is used, or of consecutive odd frames when CRC-4 multiframe alignment is not
used. n = 0 to 4 inclusive and corresponds to a byte of the receive national bit buffer.
Table 173 - Transmit National Bit Buffer Bytes Zero to Four (Page 0EH)
24.0 Receive National Bit Buffer (Page 0FH)
Page 0FH, addresses 10H to 14H contain the five bytes of the receive national bit buffer (RNBB0 - RNBB4
respectively).
Bit
Name
Functional Description
7-0
RNBBn.F1 Receive S_an+4 Bits Frames 1 to 15. This byte contains the bits received in bit position n+4
-
of channel zero of frames 1, 3, 5, 7, 9, 11, 13 and 15 when CRC-4 multiframe alignment is
RNBBn.F15 used, or of consecutive odd frames when CRC-4 multiframe alignment is not used. n = 0 to
4 inclusive and corresponds to a byte of the receive national bit buffer.
Table 174 - Receive National Bit Buffer Bytes Zero to Four (Page 0FH)
153
Zarlink Semiconductor Inc.