cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 130

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

The CX28560 Memory Organization
5.8.2
Table 5-41. TSLP Channel Configuration Register
5-40
31:30
28:21
20:3
Bit
29
2
1
0
TPROTCOL[1:0]
TINV
TMASK_SB[7:0]
RSVD
TPADJ
TBUFFIEN
TEOMIEN
Field Name
TSLP Channel Configuration Register
The Transmit Channel Configuration register contains configuration bits applying to
the logical channels within the CX28560. There are 2047 such registers, one for each
channel. The TSLP Channel Configuration Register configures aspects of the channel
common to all messages passing through the channel. One descriptor exists for each
logical channel direction.
configuration descriptor. For each channel to be used in the CX28560, this register
must be configured before activation (no default values exist).
Value
—
0
1
2
3
0
1
0
0
1
0
1
0
1
TRANSPARENT.
HDLC with no FCS.
Used in TSLP for full packet forwarding and/or channel monitoring application.
HDLC with FCS16 (FCS— 2 bytes).
HDLC with FCS32 (FCS— 4 bytes).
Data Inversion Disabled.
Data Inversion Enabled.
Message is transferred to the SIU with polarity change (the inversion is done to all bits
passed).
Data Mask.
Actual data is only transmitted on bits with a value of 1 (e.g., Mask = 10000001, then
only bits 0 and 7 contain channel's data). The other bits are padded with non-data.
Enables the sub-channeling feature. Note 0h is an invalid value.
Reserved.
Pad Count Adjustment Disabled
Pad Count Adjustment Enabled.
The TSLP counts the number of zero insertions performed in a message, and reduces
the number of inter-message idle codes transmitted accordingly. The reduction of the
number of idle code bytes is calculated by dividing the number of zero insertions by 8
and rounding down. This feature allows the host approximate control over the bit rate on
the line.
Underrun Interrupt Disabled.
Underrun Interrupt Enabled.
Transmit EOM Interrupt Disabled.
Transmit EOM Interrupt Enabled.
An interrupt is generated when an end of message is transmitted by the CX28560.
Mindspeed Technologies™
Advance Information
Table 5-41
lists the values and descriptions of each channel
Description
CX28560 Data Sheet
28560-DSH-001-B