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參數(shù)資料
| 型號： | 28233-11 |
| 廠商： | CONEXANT SYSTEMS |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | ATM Transmitter/Receiver with UTOPIA Interface |
| 中文描述： | TRANSCEIVER, PQFP160 |
| 封裝： | PLASTIC, MQFP-160 |
| 文件頁數(shù)： | 96/161頁 |
| 文件大?。?/td> | 1832K |
| 代理商： | 28233-11 |
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3.0 Registers
CN8223
3.3 Configuration Control Registers
ATM Transmitter/Receiver with UTOPIA Interface
3-10
Conexant
100046C
Disables the payload length check on a per-port basis. This disable controls only the
output of cells to the FIFO interface and does not control the counting of payload
length errors. (Counts are performed collectively, not per port.)
0x29
—
CONFIG_4 (Configuration Control Register 4)
The CONFIG_ 4 register is located at address 0x29 and controls miscellaneous functions.
4
1
Check Input Parity
Enables parity checking at the FIFO port inputs. This bit must be enabled for the
input parity error status bits or interrupts to be active.
3
1
Disable Write
Strobes on Invalid
Cells
Inhibits the receive port FIFO write strobes when a cell is determined to be invalid
for use with generic FIFOs.
2
1
Enable DS1 PRS
Generator
Causes the physical layer data content to be replaced by a quasi-random signal
stream. This stream is used for certain transmission tests in DS1 systems.
1
1
HEC Coverage
Determines the calculation range for the HEC. If this bit is low, the HEC is calculated
over header octets 1
–
4 for ATM cells. If this bit is high, the HEC is calculated over
header octets 2
–
4 for SMDS/802.6 cells.
0
1
Enable HEC Coset
Enables the x
6
+ x
4
+ x
2
+ 1 polynomial to be XOR
’
ed with the calculated HEC prior
to transmission and prior to error detection/correction if HEC is internally
generated. For TAXI mode, enable HEC Coset must be active.
Bit
Field
Size
Name
Description
Bit
Field
Size
Name
Description
15-12
4
Disable CRC
Check-Ports 3
–
0
Disables the payload CRC check on a per-port basis. This disable controls only the
output of cells to the FIFO interface and does not control the counting of payload
CRC errors. (Counts are performed collectively, not per port.)
11-8
4
Disable Length
Check-Ports 3
–
0
7-4
4
Disable Port
Reception-Ports
3
–
0
Disables the output of any received cells on a per-port basis. This disable control is
internally synchronized to cell boundaries so that no partial cells are output on a
port.
3
1
Enable TAXI
Interface
Enables an interface specific to 100 Mbps 4B/5B data transceivers on the parallel
interface port. This interface is detailed in
Section 2.5.1
.
2
1
Delete Idle Cells
Allows the screening of cells matching the receive idle header and mask criteria
from appearing on the outputs of any of the receive ports. When this bit is low, idle
cells are not automatically screened from port output. When this bit is high, idle
cells are screened from output on the receive FIFO port.
1
1
Enable External
Section Trace
Allows the section trace octet (C1) to be inserted externally. When this bit is low, the
C1 octet is generated internally. When this bit is high, the C1 octet is inserted from
the TXOVH input bus.
0
1
STM-1/STS-3c
Pointer
Enables the SS bits to be generated in the AU-4 pointer for STM-1 compatibility.
When this bit is low, an STS-3c H1/H2 pointer is generated by the transmitter (no SS
bits present) and the C2
octet
(1)
has the value 0x13. When this bit is high, an STM-1
AU-4 pointer is generated with the SS bits set to 10.
NOTE(S):
(1)
The C2 octet is the STS Path Signal Label. It is allocated to indicate the content of the STS SPE, including the status of the
mapped payloads.
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