28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 37

• 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 1-4.
28478-DSH-002-E
2, 6, 10, 16,
20, 24, 30,
34
3, 7, 11, 17,
21, 25, 31,
207
Pin No.
MQFP
CN8478 Hardware Signal Definitions (3 of 6)
RDAT[7:0]
ROOF[7:0]
Pin Label
Preliminary Information / Mindspeed Proprietary and Confidential
Receive Data
Receiver Out-of-Frame
(1)
Signal Name
Mindspeed Technologies
(1)
I/O
I
I
Serial data sampled on active edge of receive clock, RCLKx.
If channel is mapped to a time slot, input bit is sampled and transferred to
memory. If channel is unmapped to time slot, data bit is considered
invalid, and MUSYCC ignores received sample.
ROOFx is sampled on the specified active edge of the corresponding
receive clock, RCLKx. See ROOF_EDGE bit field in
As ROOFx signal transitions from low to high, an Out-of-Frame (OOF)
condition is indicated. As long as ROOFx is asserted, the received serial
data is considered OOF.
Depending on the state of OOFABT bit field in
processing may be disabled for the entire channel group (all channels
disabled) while ROOFx remains asserted.
Upon deassertion of ROOFx, bit-level processing resumes for all affected
channels. If the flywheel mechanism is used, no other synchronization
signal is required, because MUSYCC tracks the start of each subsequent
frame during the OOF period. If the flywheel mechanism is not used, then
a subsequent RSYNCx assertion is required to indicate the start of the next
frame. See SFALIGN bit field in
®
Definition
Table
5-10.
Table
Table
5-10, receive bit
5-12.
24