MT9075A Mitel Networks Corporation, MT9075A Datasheet - Page 64

• Manufacturer Part Number: MT9075A
• Description: E1 Single Chip Transceiver
• Manufacturer: Mitel Networks Corporation

MT9075A
Transmit National Bit Buffer (Page 0DH)
Page 0DH, addresses 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 10H) is one.
Receive National Bit Buffer (Page 0EH)
Page 0EH, addresses 10H to 14H contain the five bytes of the receive national bit buffer (RNBB0 - RNBB4
respectively).
Transmit Message Mode Buffer Zero and One (Pages 0FH and 10H)
Pages 0FH and 10H together contain 32 byte storage locations for data that may be transmit onto the equivalent
PCM 30 transmit timeslot. Transmission of these bytes is enabled by setting the TXMSG bits (bit 7) in the
equivalent Per Time Slot Control Register (page 07H and 08H). Table 97 shows the mapping between the Tx
Message Buffer addresses and the equivalent PCM 30 Channels.
4-192
Page 0FH (Tx Message
Buffer 0) Address:
Equivalent
Timeslots
Page 10H (Tx Message
Buffer 1) Address:
Equivalent
Timeslots
7 - 0
7 - 0
Bit
Bit
RNBBn.F15
TNBBn.F15
RNBBn.F1
PCM
PCM
TNBBn.F1
Name
Name
-
-
Table 95 - Transmit National Bit Buffer Bytes Zero to Four (Page 0DH)
Table 96 - Receive National Bit Buffer Bytes Zero to Four (Page 0EH)
30
30
Table 97 - Pages 0FH & 10H Address Mapping to CEPT Channels
0
0
0
16
Transmit S
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.
Receive S
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.
1
1
1
17
2
2
2
18
a n+4
a n+4
3
3
3
19
Bits Frames 1 to 15. This byte contains the bits received in bit
Bits Frames 1 to 15. This byte contains the bits transmitted in bit
4
4
4
20
5
5
5
21
Functional Description
Functional Description
6
6
6
22
7
7
7
23
8
8
8
24
9
9
9
25
Preliminary Information
10
10
10
26
11
11
11
27
12
12
12
28
13
13
13
29
14
14
14
30
15
15
15
31