28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 97

• Manufacturer Part Number: 28478G-18
• Description: Multichannel Synchronous Communications Controller 208-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of 28478G-18

• Package: 208BGA
• Maximum Data Rate: 32768 Kbps
• Transmission Media Type: Wire
• Power Supply Type: Analog
• Typical Supply Current: 250 mA
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V

Table 5-10.
28478-DSH-002-E
Field
Bit
6
5
4
3
2
1
0
MSKCOFA
SUBDSBL
MSKOOF
MCENBL
OOFABT
RXENBL
Group Configuration Descriptor (2 of 2)
TXENBL
Name
Preliminary Information / Mindspeed Proprietary and Confidential
Value
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Message Configuration Bits Copy Disable. Not supported.
Message Configuration Bits Copy Enable. A set of configuration bits are copied from the last transmit
buffer descriptor of a message (with EOM = 1) into internal configuration space and subsequently
acted upon. The bits are used in specialized data communications applications requiring non-default
idle code transmission on a per-message basis, inter-message pad fill, and/or message
retransmission.
Direct writes to MUSYCC that change any message configuration bits remain available. Only
automatic copying from a transmit buffer descriptor (with the bit field EOM set to 1) is disabled.
For a thorough discussion on message configuration bits see the Message Configuration Bits
subsection in the Protocol Support section.
Change of Frame Alignment Interrupt Enabled. If COFA is detected, generate Interrupt Descriptor
indicating COFA.
Change of Frame Alignment Interrupt Disabled. If COFA is detected, do not generate Interrupt
Descriptor.
Out of Frame/Frame Recovery Interrupt Enabled—Receive Only. If OOF/FREC is detected, generate
Interrupt Descriptor indicating OOF/FREC.
Out of Frame/Frame Recovery Interrupt Disabled—Receive Only. If an OOF condition exists and an
ABT, FCS, LNG, or ALIGN error occurs, an OFF error is reported in the interrupt descriptor and buffer
status descriptor instead of these errors, regardless of the MSKOOF bit.
OOF Message Processing Enabled—Receive Only. When OOF condition is detected, continue
processing incoming data.
OOF Message Processing Disabled—Receive Only. Incoming messages on all channels are aborted
when the OOF condition is detected. HDLC channels recover automatically after the OOF condition has
cleared. However, Transparent mode channels are automatically deactivated when the OOF condition
is detected, and the host must reactivate all Transparent channels after the OOF condition has cleared.
Subchanneling Enabled. Allows subchanneling.
Subchanneling Disabled. Overrides Subchannel Enable bit for all time slots and disallows
subchanneling.
Using this field to disable subchanneling frees Subchannel Descriptor Map memory space for use as
an extended data buffer space.
Transmitter Disabled. Logically resets time slot enable bits for all time slots. Transmit data lines are
three-stated. This logical, channel-group-wide state does not affect the bit values in any time slot
map.
Transmitter Enabled. Logically allows all channels with time slot enable bits set to start processing
data. This logical, channel-group-wide state does not affect the bit values in any time slot map.
Receiver Disabled. Logically resets time slot enable bits for all time slots. This logical, channel-group-
wide state does not affect the bit values in any time slot map.
Receiver Enabled. Logically allows all channels with time slot enable bits set to start processing data.
This logical, channel-group-wide state does not affect the bit values in any time slot map.
Mindspeed Technologies
®
Description
Memory Organization
84