28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 112

• 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 5-25.
5.2.4.8
The Next Message Pointer is a 32-bit dword-aligned address pointing to the first dword of a Message Descriptor
which is next in a list of descriptors.
Table 5-26
first Message Descriptor and not to itself.
Table 5-26.
5.2.4.9
The Data Buffer Pointer is a 32-bit address to the first byte of a data message in shared memory. This pointer does
not have to be word- or dword-aligned.
Table 5-27
28478-DSH-002-E
Field
19:16
15:14
13:0
Field
Bit
31:2
Bit
1:0
lists the Next Descriptor Pointer and its description. The last Next Message Pointer should point to the
lists the Data Buffer Pointer and its description.
ERROR[3:0]
DLEN[13:0]
NEXTPTR[29:0]
NEXTPTR[1:0]
Receive Buffer Status Descriptor (2 of 2)
Next Descriptor Pointer
Name
RSVD
Name
Next Message Pointer
Data Buffer Pointer
Preliminary Information / Mindspeed Proprietary and Confidential
Value
13–15
3–7
10
11
12
—
0
1
2
8
9
0
Value
—
0
OK: No error detected in this receive buffer.
BUFF: Buffer Error. Data is lost. For receive: Internal data buffer overflow.
COFA: Change Of Frame Alignment. RSYNC signal is misaligned with the flywheel in the serial
interface.
Reserved.
OOF: Out of Frame. ROOF signal is asserted.
FCS: Frame Check Sequence Error. Received HDLC frame is terminated with proper 7Eh flag, but
computed FCS does not match received FCS.
ALIGN: Octet Alignment Error. Message payload size, after zero extraction, is not a multiple of 8 bits.
This error takes precedence over an FCS error.
ABT: Abort Flag Termination. Received message is terminated with abort sequence, seven sequential
1s, instead of a closing flag (7Eh).
LNG: Long Message. Message payload size greater than selected limit was received. Message
processing is terminated and transfer to shared memory is discontinued. Channel resumes scanning
for HDLC flags or idle codes.
Reserved.
Reserved.
Received Octets.
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These 30 bits are appended with 00b to form a dword-aligned 32-bit address. This address
points to the next message descriptor in the list.
Ensures dword alignment.
®
Description
Description
Memory Organization
99