BT8222EPFF CONEXANT [Conexant Systems, Inc], BT8222EPFF Datasheet - Page 62
![no-image](/images/no-image-200.jpg)
BT8222EPFF
Manufacturer Part Number
BT8222EPFF
Description
ATM Transmitter/Receiver with UTOPIA Interface
Manufacturer
CONEXANT [Conexant Systems, Inc]
Datasheet
1.BT8222EPFF.pdf
(161 pages)
- Current page: 62 of 161
- Download datasheet (2Mb)
2.0 Functional Description
2.6 ATM Cell Processing
2-28
2.6.1.2 Cell Generation
Interrupts for Transmit
Status and Status
Table 2-18. Overhead Field Locations
registers [0x04–0x07], disable the field generation and allow the existing field to
pass. Error HEC [bit 11] and Error Payload CRC [bit 12] force a single error
occurrence in the generated field. The Error functions are cleared after the error
is generated. This allows the microprocessor to easily generate a specific number
of errors. The error pattern programmed in the TXFEAC_ERRPAT register
[0x03] is used with the Error HEC control to generate a specific number of HEC
errors for checking receiver error correction/detection circuitry.
The Inhibit Single Cell Generation [bit 13] field in CELL_GEN_x, inhibits cell
transmission from the port for a single cell interval. A single idle cell (with header
contents as defined in the Transmit Idle Header Register [0x0A–0x0B] and
payload set to all 0s) is transmitted in place of a data cell from this port at the next
cell interval if the priority control tries to obtain a cell from this port. This bit is
cleared by the cell generation circuitry after the idle cell has been transmitted or if
a cell from another port is selected by the priority control. The microprocessor
can poll this bit to determine when the idle cell insertion has been completed.
header for idle cells is obtained from the TX_IDLE_xx registers, and the HEC is
automatically calculated. The payload for idle cells is obtained from the
IDLE_PAY register [0x2A]. This data octet is inserted in all octet positions of the
idle cell payload. The CRC-10 can be inserted if required by setting Disable
Payload CRC of CELL_GEN_x to zero.
A per-port count of cells transmitted is maintained in the CELL_SENT_CNTx
counters [0x4E–0x51] for each port. These counters can be programmed to cause
an interrupt in the CELL_STATUS register [0x3B] by setting enable bits in the
EN_CELL_INT register 0x30]. The interrupt clears when CELL_STATUS is
read. If the counter interrupt is not enabled, the counter stops at its maximum
value of 65,535. If the interrupt is enabled, the counter interrupts on “roll over”
and continues counting. The counter clears when it is read.
Cell Header
Header Error Control
Segment Type
Sequence Count
Length Field
Payload CRC
Disable HEC [bit 9] and Disable Payload CRC [bit 10] in the CELL_GEN_x
The Error Payload CRC bit inserts 4-bit errors into the payload CRC field.
Idle cells are automatically generated when no transmit port is active. The
Overhead Field
Conexant
Header Register TX_HDR or FIFO input
HEC Generation Circuit or FIFO input
FIFO Input
FIFO Input
FIFO Input
Payload CRC Generation Circuit or FIFO Input
ATM Transmitter/Receiver with UTOPIA Interface
Source
100046C
CN8223
Related parts for BT8222EPFF
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![FM336PLUS-D](/images/no-image3.png)
Part Number:
Description:
V.34/Group 3 High Performance Fax Modem Family
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![DS96-L147-203](/images/no-image3.png)
Part Number:
Description:
SmartV.XX Modem
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24123](/images/no-image3.png)
Part Number:
Description:
Demodulator and FEC Decoder Low-power QPSK demodulator for worldwide satellite set-top box applications
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24130](/images/no-image3.png)
Part Number:
Description:
Dual Stream QPSK/BPSK Demodulator lC
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24143](/images/no-image3.png)
Part Number:
Description:
Single-Chip FTA and FTA-CI Set-Top Box System Solution
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24160](/images/no-image3.png)
Part Number:
Description:
Dual Digital Broadcast MPEG-2 Standard Definition TV Decoder with PVR Support
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24170](/images/no-image3.png)
Part Number:
Description:
Digital Broadcast High-Definition TV Decoder with PVR Support
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX24183](/images/no-image3.png)
Part Number:
Description:
MPEG-4 AVC/H.264 Video Decoder
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX2427X](/images/no-image3.png)
Part Number:
Description:
Dual Decode HDTV MPEG-2/H.264/VC-1 Video Decoder
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![BT8954](/images/no-image3.png)
Part Number:
Description:
VOICE PAIR GAIN FRAMER
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CX28331-1X](/images/no-image3.png)
Part Number:
Description:
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CN8330EPD](/images/no-image3.png)
Part Number:
Description:
DS3/E3 Framer with 52 Mbps HDLC Controller
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![CN8380EPF](/images/no-image3.png)
Part Number:
Description:
integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![FM336PLUS-D](/images/no-image3.png)
Part Number:
Description:
V.34/Group 3 High Performance Fax Modem Family
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet:
![DS96-L147-203](/images/no-image3.png)
Part Number:
Description:
SmartV.XX Modem
Manufacturer:
CONEXANT [Conexant Systems, Inc]
Datasheet: