T8207-BAL-DT Agere Systems, Inc., T8207-BAL-DT Datasheet - Page 47
T8207-BAL-DT
Manufacturer Part Number
T8207-BAL-DT
Description
CelXpres ATM interconnect. Dry-bagget, tape & reel .
Manufacturer
Agere Systems, Inc.
Datasheet
1.T8207-BAL-DT.pdf
(158 pages)
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Advance Data Sheet
September 2001
Agere Systems Inc.
9
9.4
In this special UTOPIA mode, the T8207 transmits a 55-byte cell, as opposed to 53 bytes, on the UTOPIA bus. The
extra 2 bytes are the tandem routing header received with the cell from the cell bus. These 2 bytes are appended
to the beginning of the cell with the tandem routing header [15:8] byte first, followed by the tandem routing header
[7:0] byte. Clearing the sp_utopia_sel* bit in the main configuration 1 register (address 0100h) enables this mode.
The start of cell signal (u_txsoc) is asserted only once with the first tandem routing header byte. The T8207 may be
configured for 55-byte UTOPIA mode whether it is an ATM or PHY device.
CONTROLLER
QUEUE FILL
EXTERNAL
MANAGER
UTOPIA Interface
SDRAM
SDRAM
55-Byte UTOPIA Mode
INSERTION
FECN ENA
EFCI
(continued)
Figure 12. TX UTOPIA Cell Handling
CELL BUFFER
CELL BUFFER
CELL BUFFER
CELL BUFFER
TX UTOPIA
TX UTOPIA
TX UTOPIA
TX UTOPIA
QUEUE 62
QUEUE 63
(2 CELLS)
(2 CELLS)
(2 CELLS)
(2 CELLS)
QUEUE 0
QUEUE 1
INSERTION
HEC
53-byte CELL TO TX UTOPIA
ATM Interconnect
CelXpres T8207
5-7783aF
47
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