TXC-05802AIPQ Transwitch Corporation, TXC-05802AIPQ Datasheet - Page 9

• Manufacturer Part Number: TXC-05802AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-05802AIPQ

• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature Classification: Industrial
• Package Type: PQFP
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / Rohs Status: Not Compliant

For each of the routing methods the cells can be sent to different output queues according to whether the cell
is used as a data cell or as control/loopback cell. Furthermore, data cells can be selected to go to four different
data outlet queues: Control Data queue, Constant Bit Rate (CBR) queue, Variable Bit Rate (VBR) queue, and
Available Bit Rate (ABR) queue. The CUBIT- Pro can be programmed to receive cells into separate queues
(split-queue mode) or not (single-queue mode).
The encoding rules for the two-byte CellBus Bus Routing Header in Bits 31-16 of Cycle 1 are summarized in
Figure 5.
CellBus Bus Routing Header Format
The CellBus Bus Routing Header contains the following fields, as shown in Figure 5:
R: Multi-PHY selector field (2 bits). Not interpreted by CUBIT- Pro currently (passed through intact). This field is
Q: Queue selection field for split-queue mode (2 bits). 00 is outlet Control Data queue, 01 is Constant Bit Rate
A: CUBIT- Pro single address field (5 bits, for 32 addresses). A0 is the LSB. For example, A(4-0)=00000 is the
M: Multicast number field (8 bits, for 256 multicast sessions). M0 is the LSB.
ignored.
(CBR) queue, 10 is Variable Bit Rate (VBR) queue, 11 is Available Bit Rate (ABR) queue. This coding is
only valid for data cells which contain Q1,Q0 fields in the header. For multicast and broadcast cell routing,
cells are routed to the VBR and CBR queues, respectively, when using split-queue mode.
address value for the CUBIT whose five device identity straps UA(4--0) are all tied high (HHHHH).
31
31
31
31
31
31
31
0 0
0 1
0 0 0
0 0 1
0 1 1
1 0
1 1
R
R
R
1
_ _ _ _
1
1
R
R
R
0
_ _ _
_ _ _
_ _ _
0
0
M
M
Q
1
7
7
Q
M
M
0
6
6
M M
M M
0
0
1
1
1
5
5
Figure 5. CellBus Bus Routing Header Formats
A
4
A
4
A
4
_ _ _ _ _ H
_ _ _ _ _ H
4
4
M
M
A
A
A
3
3
3
3
3
M
M
A
2
A
2
A
2
2
2
M
M
A
A
A
1
1
1
1
1
M
M
A
A
A
0
0
0
0
0
H
H
H
H
H
3
3
3
3
3
3
3
H
H
H
H
H
H
H
2
2
2
2
2
2
2
H
H
H
H
H
H
H
1
1
1
1
1
1
1
16 15
16 15
16 15
16 15
16 15
16 15
16 15
H
H
H
H
H
H
H
0
0
0
0
0
0
0
- 9 -
Tandem Routing Header
Tandem Routing Header
Tandem Routing Header
Tandem Routing Header
Tandem Routing Header
Tandem Routing Header
Tandem Routing Header
0
0
0
0
0
0
0
Single Address_Data
Single Address_Control
Single Address_Loopback
Broadcast Address_Data
Broadcast Address_Control
Multicast Address_Data
Multicast Address_Control
Ed. 3, November 1999
TXC-05802
CUBIT- Pro
TXC-05802-MB