XRT94L33_3 Datasheet, PDF (335/801 Pages) Exar Corporation – -CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - SONET REGISTERS

Rev222...000...000
XRT94L33
333---CCCHHHAAANNNNNNEEELLL DDDSSS333///EEE333///SSSTTTSSS---111 TTTOOO SSSTTTSSS---333///SSSTTTMMM---111 MMMAAAPPPPPPEEERRR ––– SSSOOONNNEEETTT RRREEEGGGIIISSSTTTEEERRRSSS
Table 228: Transmit STS-3 Transport – E2 Byte Value Register (Address Location=0x1947)
BIT 7
R/W
0
BIT 6
R/W
0
BIT 5
R/W
0
BIT 4
BIT 3
Transmit_E2_Byte_Value[7:0]
R/W
R/W
0
0
BIT 2
R/W
0
BIT 1
R/W
0
BIT 0
R/W
0
BIT NUMBER
NAME
7–0
Transmit_E2_Byte_Value[7:0]
TYPE
R/W
DESCRIPTION
Transmit E2 Byte Value:
The exact function of these register bits depends upon
whether Bit 7 (Enable All STS-1s) within the “Transmit STS-3
Transport – E2 Byte Control” Register (Address Location=
0x1944) has been set to “0” or “1”; as described below.
If “Enable All STS-1s” is set to “0”
If the appropriate “E2 Insert Method” is selected, then these
READ/WRITE bit-fields will permit the user to specify the
contents of the E2 byte, within the “outbound” STS-3 signal.
More specifically, this value will be loaded into the E2 byte
position, within STS-1 # 1 (within the outbound STS-3 signal).
If Bit 5 (E2 Insert Method) within the Transmit STS-3 Transport
– SONET Transmit Control Register – Byte 1 (Address
Location= 0x1902) is set to “1”, then the Transmit STS-3 TOH
Processor block will load the contents of this register into the
“E2” byte-field, within each outbound STS-3 frame.
If “Enable All STS-1s” is set to “1”
In this mode, these register bit permit the user to have direct
READ/WRITE access of the “STS-1 E2 Byte shadow” register;
that is being pointed at by the “E2 Pointer[1:0]” value.
These register bits are ignored if Bit 5 (E2 Byte Insert Method)
is set to “0”.
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