CN8330 Datasheet, PDF (67/101 Pages) Conexant Systems, Inc – DS3/E3 Framer with 52 Mbps HDLC Controller

CN8330
DS3/E3 Framer with 52 Mbps HDLC Controller
3.0 Registers
3.2 Status Registers
0x14—Terminal Data Link Status Register (SR04)
The Terminal Data Link Status Register contains the status indications for the LAPD receiver of the terminal
data link. This data link is only defined in C-bit parity or E3 modes. Terminal data link reception is described in
the Receiver Operation section of the Functional Description chapter.
Terminal data link receiver functions include FCS checking, transparency bit removal, and flag detection.
LAPD messages may be read from the Receive Terminal Data Link Message Buffer [RxTDL;0x40–0x47], and
require the use of the DLINT/SOURCELB interrupt to synchronize the transfer of message data between the
receiver and microprocessor.
NOTE(S): Reserved bits in Control Registers must be set to zero.
7
Reserved
RxByte[2:0]
RxIdle
BadFCS
RxAbort
6
Reserved
5
RxByte[2]
4
RxByte[1]
3
RxByte[0]
2
RxIdle
1
BadFCS
0
RxAbort
Byte Pointer—A 3-bit pointer to the last location written in the Receive Terminal Data Link
Message Buffer.
Idle Code Received—Indicates that an idle flag sequence (01111110) was received on the
terminal data link.
Bad FCS—Set when an erroneous FCS was received at the end of a message or an idle flag is
received that is not byte aligned.
Abort Flag Received—Set if an abort sequence (seven consecutive ones) is received on the
terminal data link.
0x15—Part Number/Hardware Version Register (SR05)
The Part Number/Hardware Version Register contains a part number in the upper nibble and a version number
in the lower nibble. This register is provided so that the processor will know what version of the CN8330 is
present. This enables loading of version-specific software, if needed. The part number for the CN8330 framer is
0000. The version number is indicated below and will be incremented with any change in circuitry within the
IC.
7
Part[3]
6
Part[2]
5
Part[1]
4
Part[0]
U
Conexent Part Number
CN8330EPJ
CN8330EPJB
CN8330EPJC/CN8330EPFC
CN8330EPJD/CN8330EPFD
3
Ver[3]
2
Ver[2]
Obsolete Base₂ Part
Number
UGA-330-1
UGA-330-2
—
—
1
Ver[1]
0
Ver[0]
Hex Value
0x01
0x02
0x03
0x04
100441E
Conexant
3-9