TXC-06312BIOG Transwitch Corporation, TXC-06312BIOG Datasheet - Page 166

• Manufacturer Part Number: TXC-06312BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06312BIOG

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PRELIMINARY TXC-06312B-MB, Ed. 2
June 2005
PHAST-12N Device
DATA SHEET
TXC-06312B
Offset
Offset
0x0400
0x0000 0
Bits
Bits
TOH_Contents
TOH_Port_Enable
Table 30: Transmit TOH Port Configuration
Name
Name
Table 29: TOH Generator
-
Memory Maps and Bit Descriptions
See desc.
Init
Init
0x0 Enables TX side TOH port when 0x1.
rw
Access
(T_TOH_GENERATOR)
Array (324) of nine_bits
Offset between two elements = 0x2.
Array index indicates the TOH byte number.
This array contains the TOH for a single STM-4 or 4
times STM-1. Each TOH byte is represented by a nine
bit word. The most significant bit determines the source
of the corresponding byte (0x0 = internal memory, 0x1 =
TOH Port Interface). This way of determining the source
of a byte is the default behavior. For certain bytes (DCC-
bytes, M1, K1, K2), other sources than internal memory
or TOH-Port can be selected by extra settings which
override this default behavior.
The least significant byte contains the byte value when
this bytes has to be inserted from memory.
The order in which bytes are mapped in memory is the
same order as these bytes appear in the TOH. For
STM-1 mode the columns are byte interleaved: column
#1 corresponds to line 1, column 2 to line 2, etc.
The byte number can easily be calculated as follows:
byte number = (a-1)x36 + (b-1)x4 + c-1
where
See also [ITU-T G.707/Y.1322] for the TOH bytes
locations.
Note 1: Space is also reserved for the administrative
Unit Pointer bytes (a = 4) but these bytes are not used.
Note 2: K1/K2 can not be sourced from this internal
memory. Separate sixteen bit registers are provided for
these bytes to guarantee that K1 and K2 are kept
together.
Note 3: B1 and B2 byte locations serve as an error
mask which will be EXORed with the calculated BIP.
These locations must be 0x00 for normal operation.
Note 4: A1 bytes (bytes 0-11) are initialized to 0xF6, A2
bytes (bytes 12-23) are initialized to 0x28. All other
entries are initialized to 0x00.
• a = row number (1 to 3, 5 to 9)
• b = multi-column number (1 to 9)
• c, for STM-4 mode = depth of the interleave within
• c, for STM-1 mode = line number (1-4)
(T_TOHG_Common_Config)
the multi-column (1-4)
-
Description
Description
1 6 6 o f 2 0 2