NEC UPD98413 User Manual page 181

(11) Transmit LOH mode register (MDLOHT)
The MDLOHT register sets the modes related to transmit LOH operation.
Register
Name
Port0:
MDLOHT 0044H
31 30 29 28
15 14 13 12
Bit Field
D31-D3 Reserved Set to 0.
D2 ALRDIM Controls the automatic loopback transmission function of Line RDI.
D1 B2M Selects even or odd parity for BIP-96 (B2) parity operation of transmit line.
D0 UUBM Selects a value to be inserted in the unused byte area of the transmit overhead.
CHAPTER 5 REGISTERS
Address
Port1: Port2: Port3:
0444H 0844H 0C44H
27 26 25 24
Reserved
11 10 9 8
Reserved
1: Not automatic loopback
1: Odd parity 0: Even parity
1: Inserts FFH. 0: Inserts 00H.
PRELIMINARY
Access Default
R/W 00000000 H
23 22 21 20
7 6 5 4
Function
0: Automatic loopback
19 18 17 16
3 2 1 0
ALRDIM B2M UUBM
Default
0
0
0
0
NEC confidential and Proprietary
181