4.0 Registers
RS8953B/8953SPB
4.5 Receive Payload Mapper
HDSL Channel Unit
4.5 Receive Payload Mapper
The Receive Payload Map (RMAP_1–RMAP_6) controls placement of HDSL payload bytes (byte1–byte36)
into the RFIFO by instructing the mapper to place or discard payload bytes from the received payload block.
Payload bytes are mapped sequentially from each payload block and cannot be rearranged. Payload is
subsequently combined [COMBINE_TBL; addr 0xEE] at the RFIFO outputs to reconstruct the PCM channel.
RMAP is programmed to discard bytes within the payload block that are not needed for PCM reconstruction. In
T1 mode, RMAP must be programmed to choose which HDSL channel supplies F-bits, by enabling one extra
byte of payload at the end of the payload block.
0x64—Receive Payload Map (RMAP_1)
7
6
5
4
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
0
0
0
0
—
—
RMAP[5:0]
RMAP[11:6]
RMAP[17:12]
RMAP[23:18]
RMAP[29:24]
0x65—Receive Payload Map (RMAP_2)
7
6
5
4
—
—
0x66—Receive Payload Map (RMAP_3)
7
6
5
4
—
—
0x69—Receive Payload Map (RMAP_4)
7
6
5
4
—
—
0x6A—Receive Payload Map (RMAP_5)
7
6
5
4
0
—
—
4-22
Conexant
N8953BDSB
CONEXANT [ CONEXANT SYSTEMS, INC ]
