28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 110

• 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 5-22.
Table 5-23.
5.2.4.7
The Buffer Status Descriptor contains status information regarding data buffer servicing. If configured to do so,
MUSYCC writes a Buffer Status Descriptor over a Buffer Descriptor. This descriptor includes the following fields:
•
•
•
In addition to the fields, a Receive Buffer Status Descriptor also includes the Error Status (ERROR) bit field.
Buffer Status Descriptors are designed to work with Buffer Descriptors. This allows a self-servicing buffer
mechanism where a transmit channel will empty a list of data buffers immediately after a receive channel fills those
buffers, all without host intervention. The value for the OWNER bit field in the transmit buffer is opposite of the value
of the OWNER bit field in the receive buffer descriptor.
Tables 5-24
28478-DSH-002-E
Field
27:14
13:0
Field
Bit
31
30
29
28
13:0
Owner Indicator Bit (OWNER)
End of Message Indicator (EOM)
Data Length (DLEN)
Bit
15
14
and
BLEN[13:0]
Transmit Buffer Descriptor (2 of 2)
Receive Buffer Descriptor
OWNER
Name
BLEN[13:0]
RSVD
RSVD
EOBI
5-25
REPEAT
NP
Name
RSVD
Buffer Status Descriptor
list the transmit and receive buffer status descriptors and their descriptions.
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Value
—
0
1
0
1
0
0
1
0
Value
—
0
1
0
MUSYCC Owns Buffer. Continue processing data buffer normally.
HOST Owns Buffer. Channel is to remain in idle mode while polling this bit periodically (if NP = 0)
until host relinquishes control to MUSYCC by setting OWNER = 0. In transparent mode the channel is
deactivated.
Poll Enabled. If OWNER = 1, host-owned, MUSYCC polls message descriptor periodically until
OWNER = 0.
Poll Disabled. If OWNER = 1 then wait for a Channel Activate Service Request from host.
Reserved.
End of Buffer Interrupt Disabled. When more data cannot be taken from or put into a data buffer, an
EOB interrupt is not generated.
End of Buffer Interrupt enabled.
Reserved.
Buffer Length. Actual number of received data octets might be less than this. This number indicates
how many will fit into data buffer. The buffer length should not exceed 8 k.
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Repeat message transmission disabled.
Repeat message transmission enabled.
Reserved.
Buffer Length. The number of octets in data buffer to be transmitted. In general, this would equal
the allocated buffer size.
®
Description
Description
Memory Organization
97