參數(shù)資料
型號： TMUX03155
英文描述： TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
中文描述： TMUX03155 STS-3/STM-1（非盟- 4）復用器/解復用器
文件頁數(shù)： 36/120頁
文件大?。?/td> 1542K
代理商： TMUX03155
36
Agere Systems Inc.
Data Sheet
April 2001
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
Maintenance Functions
(continued)
Transmit Functions
(continued)
Output Offset
The device will output the STS-3/STM-1 (AU-4) frame a programmable number of clock cycles from the input
frame sync. These registers allow movement of the output frame with a granularity of one high-speed clock cycle.
The values programmed in (
TLBITCNT[2:0],
TLSTS1CNT[1:0],
TLCOLCNT[6:0]
,
TLROWCNT[3:0], 0x53, 0x54
)
must be within the valid ranges for the mode selected (see Table 15). See Table 56 on page 77 for more details.
Transmit Transport Overhead Access Channel (TTOAC)
A transport overhead access channel (TOAC) is provided on-chip to provision the TOH portion of the outgoing
SDH or SONET frame. The TOAC consists of the following signals:
I
A 5.184 MHz clock signal, sourced by the device (
TTOACCLKO, TTOAC_CLKINV
).
I
A 5.184 Mbits/s data signal received by the device in the transmit direction (
TTOACDATAI
).
I
An 8 kHz synchronization signal (
TTOACSYNCO
), sourced by the device. The sync signal is normally low;
during the last clock period of each frame coincident with the least significant bit of the eighty-first byte or during
the first clock period of each frame coincident with the most significant bit of the first byte, the sync signal is high
(
TTOACSA1orEND, 0x4F
).
An inhibit signal is provided through the control interface to place the clock and sync signals in a high-impedance
state (
TTOACINH, 0x4F
).
The data signal is partitioned into frames of 81 bytes. The frame repetition rate is 8 kHz. Each byte consists of
8 bits that are received most significant bit first. The MSB of the first byte of each frame contains an odd/even parity
bit over the 648 bits of the previous frame. The remaining 7 bits of this byte are not specified.
Bytes shown in Table 16 summarize the access capabilities of the transmit TOAC. Bytes indicated in bold type are
not specified in the standard, but are labeled here for clarity. X symbols indicate don’t cares.
Table 15. Value Offset Load Values
Mode
TLBITCNT[2:0]
TLSTS1CNT[1:0]
TLCOLCNT[6:0]
TLROWCNT[3:0]
BIT
0—7
0—2
0—89
0—8
NIBBLE
0—1
0—2
0—89
0—8
BYTE
0
0—2
0—89
0—8
Table 16. Transport Overhead Byte Access—Transmit Direction
OH Pty
X
D1
X
X
D4
D7
D10
S1
X
B1-2
D1-2
X
X
D4-2
D7-2
D10-2
Z1-2
X
B1-3
D1-3
X
X
D4-3
D7-3
D10-3
Z1-3
X
E1
D2
X
X
D5
D8
D11
Z2
X
E1-2
D2-2
X
K1-2
D5-2
D8-2
D11-2
Z2-2
X
E1-3
D2-3
X
K1-3
D5-3
D8-3
D11-3
X
X
F1
D3
X
X
D6
D9
D12
E2
X
F1-2
D3-2
X
K2-2
D6-2
D9-2
D12-2
E2-2
X
F1-3
D3-3
X
K2-3
D6-3
D9-3
D12-3
E2-3
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