tdat04622 ETC-unknow, tdat04622 Datasheet - Page 60

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

TDAT042G5 SONET/SDH
155/622/2488 Mbits/s Data Interface
Pin Information
Table 5
32
AN18
AL30
Y32
H31
Pin
.
Pin Descriptions—Enhanced UTOPIA Interface Signals (continued)
Symbol
TxSZ[D]
TxSZ[C]
TxSZ[B]
TxSZ[A]
(continued)
(5 V tolerant)
3.3 V
Type
I/O
I
Transmit Size. These pins are used only in U2+ and U3+
(packet) modes. This signal defines the valid bytes transmitted
and their packing within (1) TxDATA[D:A][15:0] for U2+ 16-bit
mode, and (2) TxDATA[A][15:0] and TxDATA[B][15:0] for the U3+
(32-bit mode). The meaning of these bits may be inverted
through UT register 0x0226 TxSIZE/RxSIZE mode, page 164.
In U3+ (8-bit mode), TxSZ[D:A] are unused.
For U2+ 16-bit mode,
For U3+ (32-bit mode), TxSZ[A] and TxSZ[B] are combined to
define four states of the transmitted data stream. TxSZ[C] and
TxSZ[D] are unused. The following states are assigned by
TxSZ[A] and TxSZ[B] when TxEOP[A] is asserted when using
the default configuration. TxSZ[D:A] is ignored when
TxEOP[D:A] is not present.
TxSZ[A] TxSZ[B] DATA[31:24] DATA[23:16]
There is no byte swapping and the data bytes are packed into
the upper transmitted bytes first.
0
0
1
1
TxSZ[D:A] = 0 defines the MSByte of TxDATA[D:A][15:0], i.e.,
TxDATA[D:A][15:8], to be the last byte of the packet transmit-
ted when using the default configuration.
TxSZ[D:A] = 1 defines the LSByte of TxDATA[D:A][15:0], i.e.
TxDATA[D:A][7:0], to be the last byte of the packet transmit-
ted when using the default configuration.
TxDATA[A][15:8] TxDATA[A][7:0]
0
1
0
1
TxDATA[A]
Valid
Valid
Valid
Valid
Name/Description
Not valid
Valid
Valid
Valid
TxDATA[B][15:8] TxDATA[B][7:0]
DATA[15:8]
Not valid
Not valid
Valid
Valid
Agere Systems Inc.
TxDATA[B]
Data Sheet
DATA[7:0]
Not valid
Not valid
Not valid
May 2001
Valid