tdat04622 ETC-unknow, tdat04622 Datasheet - Page 77

• Manufacturer Part Number: tdat04622
• Description: Tdat Sonet/sdh 155/622/2488 Mbits/s Data Interfaces
• Manufacturer: ETC-unknow

Data Sheet
May 2001
Agere Systems Inc.
Overview
Over-Fiber Mode
Over-fiber mode is used for packet delivery over fiber. No SONET overhead is added in this mode. Since no
SONET overhead is added, the OHP and PT blocks must be configured for the bypass mode.
In transmitting from the TDAT042G5 to the line, the data engine maps the data payload into a full SONET frame
starting at what normally would be the first A1 byte. The data engine continues to map payload into the full SONET
frame until an end of packet or end of frame is reached, at which time the data engine halts the mapping of the
incoming data stream into the SONET frame until the next start of frame.
When TDAT042G5 is receiving from the line, the data engine must be provisioned to receive the maximum packet
size, unless the location of the last byte of the packet is known in advance. If the size of the packet is not known,
one must program the data engine to receive the entire SONET frame. The external UTOPIA interface device must
then be capable of extracting the variable length packets from the full SONET frame.
Details of the over-fiber mode are given in the Data Engine (DE) Block section, page 82.
Test and General-Purpose I/O Support
The device is provisioned, controlled, and monitored using a generic 16-bit microprocessor interface. A standard
five-signal IEEE -1149.1 compliant JTAG test port is also provided for boundary-scan purposes.
A 4-bit GPIO (general-purpose input/output) interface is provided to control and/or monitor other onboard devices.
External Interfaces
Figure 4 shows the external interfaces.
TxFSYNC
ECLREF
CLKDIV
TxCKQ
RxCLK
TxCK
RxD
TxD
2
2
32
2
2
32
2
(continued)
R
T
X
X
LINE
LINE
JTAG
5
Figure 4. External Interface Summary Diagram
GPIO
T
4
X
TOHF
RST
ICT
T
X
PMRST
TOHD
4
MPU AND TEST INTERFACE
T
MPMODE
X
TOHCK
R
MPCLK
X
REF
OHP
R
CS
X
TOHF
INT
4
DATA
R
X
TOHCK
16
ADDR
4
16
R
ADS
X
155/622/2488 Mbits/s Data Interface
TOHD
4
R/W
DS
DT
348 SIGNAL PINS
TDAT042G5 SONET/SDH
4 x 24 Tx UTOPIA
+5 MPHY ADDRESS
4 x 24 Rx UTOPIA
+5 MPHY ADDRESS
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