cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 297

• Manufacturer Part Number: cn8236
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

CN8236
ATM ServiceSAR Plus with xBR Traffic Management
12.4.1 Cell Tagging
28236-DSH-001-B
12.4 UTOPIA Level 2 Interface
The CN8236 supports both UTOPIA Level 1 and Level 2 interfaces. These are
described in general terms below with an emphasis on their differences.
In addition to the standard 53-octet cell formats, given in
the CN8236 supports user programmable cell sizes for Routing Tag applications.
This allows a maximum cell size of 64 bytes. These cell formats are shown in
Tables 12-7
programmed into the TAG_SIZE bits of CONFIG1.
Table 12-5. Cell Format 8 Bit Mode
Bit 7
• UTOPIA Level 1: This is an 8- or 16-bit interface designed for data rates
• UTOPIA Level 2: This interface defines the Multi-port support features
Both Level 1 and Level 2 support odd parity over the width of the data bus.
up to 200 Mbps at a clock rate of 25 MHz. Both Octet-level and Cell Level
handshaking are supported.
that allow up to 31 UTOPIA devices to multiplex on one UTOPIA bus.
The SAR only supports up to eight PHY devices. It allows either 8 or 16
bit data buses and uses only cell level handshaking. It can transfer up to
800 Mbps when running at 50 MHz in the 16 bit mode.
Mindspeed Technologies
and 12-8. The number of octets added for the tagging function is
UDF1 (HEC) (byte 5)
Payload 48
Payload 1
Header 1
Header 2
Header 3
Header 4
...
:
0
™
12.0 ATM UTOPIA Interface
12.4 UTOPIA Level 2 Interface
Tables 12-5
and 12-6,
12-7